import { useIssueIdBatches } from "@/hooks/useIssueIdBatches";
import { useConversationHistoryPages, type ConversationHistoryPage } from "@/hooks/useConversationHistoryPages";
import { taskChatHashAnchor } from "@/components/task-chat/scroll-navigation";
import { useCoordinatorWorkspaceEnabled } from "@/hooks/useCoordinatorWorkspaceEnabled";
import { CoordinatorAgentSwitcher } from "@/components/CoordinatorAgentSwitcher";
import { TaskDecisionRecord } from "@/components/TaskDecisionRecord";
import { useAccountBoundMutation } from "@/hooks/useAccountBoundMutation";
import { mergeWindowComments, useIssueHistoryWindow } from "../hooks/useIssueHistoryWindow";
import type { IssueQueuedCommentQueue } from "@paperclipai/shared";
import { useTaskRunLiveUpdates } from "../context/LiveUpdatesProvider";
import { liveRunRefetchInterval } from "../lib/live-runs-cache";
import { useTaskRetry } from "../hooks/useTaskRetry";
import { grokBotApi } from "@/api/grokBot";
import { WorkspaceBaseRefRecoveryProvider } from "../components/WorkspaceBaseRefRecovery";
import { WorkspaceRetryControl } from "../components/WorkspaceRetryButton";
import { isLockedIssueStub, LockedIssueChip } from "@/components/LockedIssueChip";
import { canManageIssuePrivacy } from "../lib/issuePrivacy";
import { TextAttachmentContext } from "../context/TextAttachmentContext";
import { useTaskPluginPanels, taskPluginPanelActivationKey } from "@/hooks/useTaskPluginPanels";
import { useTaskBrowsers, useBrowserArrivals } from "@/hooks/useTaskBrowsers";
import { WorkspaceExportRecovery } from "../components/WorkspaceExportRecovery";
import { DispositionRecoveryProvider } from "../components/DispositionRecoveryNotice";
import { AgentAvatar } from "@/components/AgentAvatar";
import { mergeComposerRunSettings, type ComposerRunSettings } from "@/components/task-chat/composer-run-settings";
import { AgentIdentity } from "@/components/AgentIdentity";
import { clearLegacyChatMessageRequests } from "@/lib/chat-message-request";
import { agentChatDraft } from "@/lib/agent-chat-draft";
import { trackRecentProject } from "@/lib/recent-projects";
import { Settings as ChatSettings } from "lucide-react";
import { agentDetailHref } from "./agent-detail-navigation";
import { ExecutionBlockerNotice } from "../components/ExecutionBlockerNotice";
import type { TaskComposerPause } from "../components/task-chat/TaskChatPausedTakeover";
import { TaskDetailTasksPanel } from "@/components/task-detail/TaskDetailTasksPanel";
import { IssueCreatedFromNote } from "@/components/task-detail/IssueCreatedFromNote";
import { EmailThreadProvider } from "../components/EmailMessageCard";
import { EmailTaskActivity } from "../components/EmailTaskActivity";
import { TaskChatScrollNavigation, taskChatScrollEntry } from "@/components/task-chat/scroll-navigation";
import {
  lazy,
  memo,
  Suspense,
  useCallback,
  useEffect,
  useLayoutEffect,
  useMemo,
  useRef,
  useState,
  type ChangeEvent,
  type DragEvent,
  type ReactNode,
  type Ref,
} from "react";
import { pickTextColorForPillBg } from "@/lib/color-contrast";
import {
  Link,
  useLocation,
  useNavigate,
  useNavigationType,
  useParams,
} from "@/lib/router";
import {
  useInfiniteQuery,
  useQuery,
  useMutation,
  useQueryClient,
  type InfiniteData,
  type QueryClient,
} from "@tanstack/react-query";
import {
  usePublishSharedQueryData,
  useSharedPollingQuery,
} from "@/hooks/useSharedPolling";
import { ApiError } from "../api/client";
import { issuesApi } from "../api/issues";
import { classifySendFailure } from "../lib/pending-send";
import { useUpdateIssueMutation } from "../hooks/useUpdateIssueMutation";
import { interactionResolutionErrorMessage } from "../lib/interaction-resolution-error";
import { approvalsApi } from "../api/approvals";
import { activityApi, type RunForIssue } from "../api/activity";
import {
  heartbeatsApi,
  type ActiveRunForIssue,
  type LiveRunForIssue,
} from "../api/heartbeats";
import { instanceSettingsApi } from "../api/instanceSettings";
import { accessApi, type CurrentBoardAccess } from "../api/access";
import {
  canBoardManageRuntime,
  readRecoveryReconcileWorkspaceId,
} from "../lib/recovery-reconcile";
import { agentsApi } from "../api/agents";
import { authApi } from "../api/auth";
import { projectsApi } from "../api/projects";
import { executionWorkspacesApi } from "../api/execution-workspaces";
import { useCompany } from "../context/CompanyContext";
import { useDialogActions } from "../context/DialogContext";
import { usePanel } from "../context/PanelContext";
import { useSidebar } from "../context/SidebarContext";
import { useToastActions } from "../context/ToastContext";
import { useBreadcrumbs } from "../context/BreadcrumbContext";
import {
  assigneeValueFromSelection,
  formatAssigneeUserLabel,
  formatUserLabel,
  suggestedCommentAssigneeValue,
} from "../lib/assignees";
import {
  buildCompanyUserInlineOptions,
  buildCompanyUserLabelMap,
  buildCompanyUserProfileMap,
  buildMarkdownMentionOptions,
  isAgentTaskTarget,
} from "../lib/company-members";
import {
  extractIssueTimelineEvents,
  extractIssueWorkModeChanges,
} from "../lib/issue-timeline-events";
import { queryKeys } from "../lib/queryKeys";
import { keepPreviousDataForSameQueryTail } from "../lib/query-placeholder-data";
import { useIssueWorkProducts } from "../hooks/useIssueWorkProducts";
import {
  mergePendingIssueQueuedComments,
  normalizeIssueQueuedCommentQueue,
  startingQueuedCommentIds,
} from "../lib/issue-queued-comment-queue";
import { collectLiveIssueIds } from "../lib/liveIssueIds";
import {
  hasLegacyIssueDetailQuery,
  createIssueDetailPath,
  readIssueDetailLocationState,
  readIssueDetailBreadcrumb,
  readIssueDetailHeaderSeed,
  withIssueDetailHeaderSeed,
  rememberIssueDetailLocationState,
} from "../lib/issueDetailBreadcrumb";
import {
  resolveIssueActiveRun,
  shouldTrackIssueActiveRun,
} from "../lib/issueActiveRun";
import { prefetchIssueThread } from "../lib/issue-thread-queries";
import { getIssueDetailQueryOptions, seedIssueDetailProjections } from "../lib/issueDetailCache";
import {
  beginIssueDetailNavigation,
  recordIssueDetailReadiness,
  ISSUE_DETAIL_CONTENT_MEASURE,
  ISSUE_DETAIL_CONTENT_PAINT_MARK,
  ISSUE_DETAIL_HEADER_MEASURE,
  ISSUE_DETAIL_HEADER_PAINT_MARK,
  reportIssueDetailWebVitals,
  scheduleIssueDetailPaintMeasure,
} from "../lib/issue-detail-performance";
import {
  beginLocalInboxArchive,
  boundLocalInboxArchive,
  cancelInboxIssueQueries,
  clearLocalInboxArchive,
  confirmLocalInboxArchive,
  invalidateInboxIssueQueries,
  getIssuePresenceInActiveInboxCaches,
  removeIssueFromInboxCaches,
  restoreIssueToInboxCaches,
  snapshotInboxIssueCaches,
  type InboxIssueCacheSnapshot,
} from "../lib/inboxArchiveCache";
import {
  hasBlockingShortcutDialog,
  resolveIssueDetailGoKeyAction,
  resolveInboxQuickArchiveKeyAction,
} from "../lib/keyboardShortcuts";
import {
  applyOptimisticIssueCommentUpdate,
  applyLocalQueuedIssueCommentState,
  createOptimisticIssueComment,
  flattenIssueCommentPages,
  getNextIssueCommentPageParam,
  ISSUE_COMMENT_PAGE_SIZE,
  isQueuedIssueComment,
  loadRemainingIssueCommentPages,
  matchesIssueRef,
  mergeIssueComments,
  removeIssueCommentFromPages,
  shouldAutoloadOlderIssueComments,
  takeOptimisticIssueComment,
  upsertIssueCommentInPages,
  type IssueCommentReassignment,
  type OptimisticIssueComment,
} from "../lib/optimistic-issue-comments";
import {
  clearIssueExecutionRun,
  removeLiveRunById,
  upsertInterruptedRun,
} from "../lib/optimistic-issue-runs";
import { useProjectOrder } from "../hooks/useProjectOrder";
import { recordRecentTask } from "../lib/recent-tasks";
import {
  relativeTime,
  cn,
  formatDurationMs,
  formatTokens,
  visibleRunCostUsd,
  visibleRunTokenTotal,
} from "../lib/utils";
import { liveBlueBadge } from "../lib/status-colors";
import { ApprovalCard } from "../components/ApprovalCard";
import { ProjectTile } from "../components/ProjectTile";
import { InlineEditor } from "../components/InlineEditor";
import { useDesignSandbox } from "../context/DesignSandboxContext";
import {
  IssueChatThread,
  type IssueChatComposerHandle,
  type IssueChatRunFinalizationAction,
} from "../components/IssueChatThread";
import { TaskChatThread } from "../components/TaskChatThread";
import type { TaskChatIssueBrief } from "../components/task-chat/TaskChatDescriptionBubble";
import { useClassicTaskInterfaceEnabled } from "../hooks/useClassicTaskInterfaceEnabled";
import { useStreamlinedUiEnabled } from "../hooks/useStreamlinedUiEnabled";
import { workModeMetaFor } from "../lib/work-mode-meta";
import { IssueContinuationHandoff } from "../components/IssueContinuationHandoff";
import { IssueAttachmentsSection } from "../components/IssueAttachmentsSection";
import { IssueDocumentsSection } from "../components/IssueDocumentsSection";
import { IssuePlanDecompositionsSection } from "../components/IssuePlanDecompositionsSection";
import { IssueOutputSection } from "../components/issue-output/IssueOutputSection";
import { isImageAttachment, isVideoAttachment } from "../lib/issue-attachments";
import {
  getIssueOutputs,
  getPromotedOutputAttachmentIds,
  isImageLikeOutput,
  isVideoLikeOutput,
} from "../lib/issue-output";
import { IssueSiblingNavigation } from "../components/IssueSiblingNavigation";
import type { MarkdownExternalReferenceMap } from "../components/MarkdownBody";
import { IssuesList } from "../components/IssuesList";
import { IssueReferenceActivitySummary } from "../components/IssueReferenceActivitySummary";
import { IssueFieldChangeReceipt } from "../components/IssueFieldChangeReceipt";
import { IssueWriteDenialNotice } from "../components/IssueWriteDenialNotice";
import { issueWriteDenialForActivity } from "../lib/issue-write-denial-activity";
import { IssueRelatedWorkPanel } from "../components/IssueRelatedWorkPanel";
import {
  IssueMonitorBanner,
  IssueMonitorComposerStrip,
  hasVisibleMonitorSurface,
} from "../components/IssueMonitorBanner";
import { IssueScheduledRetryCard } from "../components/IssueScheduledRetryCard";
import { ExternallyConnectedTaskBanner } from "../components/chat/ExternallyConnectedTaskBanner";
import {
  IssueProperties,
  type IssuePropertiesDocumentDeepLink,
} from "../components/IssueProperties";
import { TaskSidePanel, type TaskSidePanelProps } from "../components/task-side-panel";
import { SidePanelToggleButton } from "../components/side-panel";
import {
  TaskTreeControlDialog,
  TaskTreeControlMenuItems,
} from "../components/TaskTreeControls";
import { waitForStoppedRuns } from "../lib/wait-for-stopped-runs";
import { useIssueExternalObjects } from "../hooks/useIssueExternalObjects";
import { IssueGalleryContext } from "../context/IssueGalleryContext";
import { useIssuePlanDocument } from "../hooks/useIssuePlanDocument";
import { useTaskArtifactArrival } from "../hooks/useTaskArtifactArrival";
import { IssueRunLedger } from "../components/IssueRunLedger";
import { IssueWorkspaceCard } from "../components/IssueWorkspaceCard";
import type { MentionOption } from "../components/MarkdownEditor";
import {
  ImageGalleryModal,
  type GalleryMediaItem,
} from "../components/ImageGalleryModal";
import {
  FileViewerProvider,
  useRequiredFileViewer,
} from "../context/FileViewerContext";
import { FileViewerSheet } from "../components/FileViewerSheet";
import { ArtifactFileChip } from "../components/ArtifactFileChip";
import { ScrollToBottom } from "../components/ScrollToBottom";
import { StatusIcon } from "../components/StatusIcon";
import { PriorityIcon } from "../components/PriorityIcon";
import { SHOW_TASK_PRIORITY_UI } from "../lib/ui-flags";
import { Identity } from "../components/Identity";
import {
  PluginSlotMount,
  PluginSlotOutlet,
  usePluginSlots,
} from "@/plugins/slots";
import { PluginLauncherOutlet } from "@/plugins/launchers";
import { Separator } from "@/components/ui/separator";
import {
  Popover,
  PopoverTrigger,
  PopoverContent,
} from "@/components/ui/popover";
import { Button } from "@/components/ui/button";
import { QueryErrorState, useQueryView } from "@/components/QueryView";
import { describeError, isTransientError } from "@/api/errors";
import {
  Sheet,
  SheetContent,
  SheetHeader,
  SheetTitle,
} from "@/components/ui/sheet";
import { Skeleton } from "@/components/ui/skeleton";
import {
  Avatar,
  AvatarFallback,
  AvatarGroup,
  AvatarImage,
} from "@/components/ui/avatar";
import {
  Tooltip,
  TooltipContent,
  TooltipProvider,
  TooltipTrigger,
} from "@/components/ui/tooltip";
import { ScrollArea } from "@/components/ui/scroll-area";
import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from "@/components/ui/dialog";
import { Textarea } from "@/components/ui/textarea";
import { formatIssueActivityAction } from "@/lib/activity-format";
import { copyTextToClipboard } from "../lib/clipboard";
import { buildIssuePropertiesPanelKey } from "../lib/issue-properties-panel-key";
import { openSkillPanelState, shouldSuppressTaskPanelUntilPlan } from "../lib/task-side-panel-state";
import {
  interactionReadinessRefetchInterval,
  isDeferredConversationInteraction,
  buildAnsweredQuestionsDeliveryText,
  buildIssueThreadInteractionSummary,
} from "../lib/issue-thread-interactions";
import { resolveIssueDocumentDeepLink, sameIssueDocumentHash } from "../lib/issue-document-deep-link";
import {
  buildIssueSiblingNavigation,
  shouldRenderRichSubIssuesSection,
} from "../lib/issue-detail-subissues";
import { filterIssueDescendants } from "../lib/issue-tree";
import { buildSubIssueDefaultsForViewer } from "../lib/subIssueDefaults";
import {
  SUCCESSFUL_RUN_HANDOFF_ESCALATED_ACTION,
  SUCCESSFUL_RUN_HANDOFF_REQUIRED_ACTION,
  successfulRunHandoffActivityTone,
} from "../lib/successful-run-handoff";
import { hasAssignedBacklogBlocker } from "../lib/issue-blockers";
import {
  Activity as ActivityIcon,
  AlertTriangle,
  Archive,
  ArrowLeft,
  Check,
  ChevronRight,
  Copy,
  EyeOff,
  ScanEye,
  Flag,
  FileCode2,
  ListTree,
  MessageSquare,
  MoreHorizontal,
  MoreVertical,
  Paperclip,
  Plus,
  Repeat,
  SlidersHorizontal,
} from "lucide-react";
import { Badge } from "@/components/ui/badge";
import { IssuePrivacyActions } from "@/components/IssuePrivacyActions";
import type { ShareSheetImplicitPrincipal } from "@/components/IssueShareSheet";
import {
  deriveOriginatingActor,
  isClosedIsolatedExecutionWorkspace,
  ISSUE_CONTINUATION_SUMMARY_DOCUMENT_KEY,
  ONBOARDING_FIRST_TASK_ORIGIN_KIND,
  type AskUserQuestionsAnswer,
  type AskUserQuestionsInteraction,
  type ActivityEvent,
  type Agent,
  type FeedbackVote,
  type Issue,
  type IssueRecoveryAction,
  type IssueAttachment,
  type IssueComment,
  type IssueRecentComments,
  type IssueDocumentSummary,
  type IssueWorkProduct,
  type IssueWorkMode,
  type IssueThreadInteraction,
  type RequestCheckboxConfirmationInteraction,
  type RequestConfirmationInteraction,
  type RequestItemVerdictsInteraction,
  type RequestItemVerdictValue,
  type SuggestTasksInteraction,
  type IssueTreeControlMode,
  type WorkspaceFileRef,
  workspaceFileRefSchema,
  isUuidLike,
} from "@paperclipai/shared";

// Stable empty array for React Query `data` defaults. A literal `= []` default
// creates a new array reference on every render while `data` is undefined
// (loading/idle), which destabilizes downstream memos and panel keys that
// depend on it. Reusing one shared reference keeps those values stable.
const EMPTY_ISSUES: Issue[] = [];

type StopAndFinalizeRunError = Error & {
  runCancelledBeforeStatusUpdateFailed?: boolean;
};

function createRunCancelledStatusUpdateError(
  err: unknown,
): StopAndFinalizeRunError {
  const message =
    err instanceof Error
      ? `Run was stopped, but updating the task failed: ${describeError(err).body}`
      : "Run was stopped, but updating the task failed. Retry the task status update.";
  const error = new Error(message) as StopAndFinalizeRunError;
  error.runCancelledBeforeStatusUpdateFailed = true;
  return error;
}

function didRunCancelBeforeStatusUpdateFail(
  err: unknown,
): err is StopAndFinalizeRunError {
  return (
    err instanceof Error &&
    (err as StopAndFinalizeRunError).runCancelledBeforeStatusUpdateFailed ===
      true
  );
}

type CommentReassignment = IssueCommentReassignment;
type ActionableIssueThreadInteraction =
  | SuggestTasksInteraction
  | RequestConfirmationInteraction
  | RequestCheckboxConfirmationInteraction;
type ResolveRecoveryActionOutcome =
  "restored" | "false_positive" | "blocked" | "cancelled";
type IssueDetailComment = (IssueComment | OptimisticIssueComment) & {
  runId?: string | null;
  runAgentId?: string | null;
  interruptedRunId?: string | null;
  queueState?: "queued";
  queueTargetRunId?: string | null;
  queueReason?: "hold" | "active_run" | "other";
  consumedByRunId?: string | null;
  consumedQueueIds?: string[];
  steeredIntoRunId?: string | null;
  conversationAnchorAt?: Date | string | null;
  conversationAnchorSequence?: number;
};

function isPlanConfirmationInteraction(
  interaction: IssueThreadInteraction,
): interaction is RequestConfirmationInteraction {
  return (
    interaction.kind === "request_confirmation" &&
    interaction.payload.target?.type === "issue_document" &&
    interaction.payload.target.key === "plan"
  );
}

function buildPlanDecisionResponseText(
  interaction: RequestConfirmationInteraction,
) {
  if (interaction.status === "accepted") return "Approved plan";
  const reason = interaction.result?.reason?.trim();
  return reason ? `Requested changes\n\n${reason}` : "Requested changes";
}

const FEEDBACK_TERMS_URL =
  import.meta.env.VITE_FEEDBACK_TERMS_URL?.trim() ||
  "https://paperclip.ing/tos";
const ISSUE_COMMENT_AUTOLOAD_LIMIT = ISSUE_COMMENT_PAGE_SIZE * 3;
const JUMP_TO_LATEST_MAX_COMMENT_PAGES = 10;
function treeControlPreviewErrorCopy(error: unknown): string {
  if (error instanceof ApiError) {
    if (error.status === 403)
      return "Only board users can preview subtree controls.";
    if (error.status === 409)
      return "Preview is stale because subtree hold state changed. Retry to refresh.";
    if (error.status === 422)
      return "This subtree action is currently invalid for the selected tasks.";
  }
  return error instanceof Error ? error.message : "Unable to load preview.";
}

export function canBoardResolveRecoveryAction(
  companyId: string | null | undefined,
  boardAccess: CurrentBoardAccess | undefined,
) {
  if (!companyId || !boardAccess) return false;
  if (boardAccess.source === "local_implicit" || boardAccess.isInstanceAdmin)
    return true;
  if (!boardAccess.memberships || boardAccess.memberships.length === 0) {
    return boardAccess.companyIds.includes(companyId);
  }

  const membership = boardAccess.memberships.find(
    (item) => item.companyId === companyId && item.status === "active",
  );
  if (!membership) return false;
  return (
    membership.membershipRole !== "viewer" && membership.membershipRole !== null
  );
}

// `canBoardManageRuntime` and `readRecoveryReconcileWorkspaceId` moved to `@/lib/recovery-reconcile`
// so the run-page recovery surface can reuse them without importing this page module. Re-exported
// here (from the top-of-file import) to keep existing import sites — and their tests — stable, while
// the imported bindings stay usable within this module.
export { canBoardManageRuntime, readRecoveryReconcileWorkspaceId };

export function shouldScrollIssueDetailToTopOnNavigation(input: {
  previousIssueId: string | undefined;
  nextIssueId: string | undefined;
  navigationType: ReturnType<typeof useNavigationType>;
}): boolean {
  if (input.navigationType === "POP") return false;
  return input.previousIssueId !== input.nextIssueId;
}

function resolveInterruptibleIssueRun(
  activeRun: ActiveRunForIssue | null | undefined,
  liveRuns: readonly LiveRunForIssue[] | undefined,
) {
  const issueLiveRun =
    (liveRuns ?? []).find((run) => run.status === "running") ??
    (liveRuns ?? []).find((run) => run.status === "queued") ??
    null;
  return (
    issueLiveRun ??
    (activeRun?.status === "running" || activeRun?.status === "queued"
      ? activeRun
      : null)
  );
}

function dedupeLiveRunsById(liveRuns: readonly LiveRunForIssue[]) {
  const seen = new Set<string>();
  return liveRuns.filter((run) => {
    if (seen.has(run.id)) return false;
    seen.add(run.id);
    return true;
  });
}

function readIssueRunStateFromCache(
  queryClient: QueryClient,
  issueId: string,
  issue: Pick<Issue, "executionRunId"> | null | undefined,
) {
  const liveRuns = queryClient.getQueryData<LiveRunForIssue[]>(
    queryKeys.issues.liveRuns(issueId),
  );
  const activeRun = queryClient.getQueryData<ActiveRunForIssue | null>(
    queryKeys.issues.activeRun(issueId),
  );
  const activeRunIsLive = Boolean(
    activeRun && liveRuns?.some((run) => run.id === activeRun.id),
  );
  const activeRunMatchesIssueLock = Boolean(
    activeRun && issue?.executionRunId && activeRun.id === issue.executionRunId,
  );
  const resolvedActiveRun =
    activeRunIsLive || activeRunMatchesIssueLock ? activeRun : null;
  return {
    liveRuns,
    activeRun: resolvedActiveRun,
    interruptibleIssueRun: resolveInterruptibleIssueRun(
      resolvedActiveRun,
      liveRuns,
    ),
  };
}

function asRecord(value: unknown): Record<string, unknown> | null {
  if (typeof value !== "object" || value === null || Array.isArray(value))
    return null;
  return value as Record<string, unknown>;
}

function extractWorkspaceFileRefFromWorkProduct(workProduct: {
  metadata: Record<string, unknown> | null;
}): WorkspaceFileRef | null {
  const metadata = asRecord(workProduct.metadata);
  if (!metadata) return null;
  const parsed = workspaceFileRefSchema.safeParse(metadata.resourceRef);
  return parsed.success ? parsed.data : null;
}

function usageNumber(usage: Record<string, unknown> | null, ...keys: string[]) {
  if (!usage) return 0;
  for (const key of keys) {
    const value = usage[key];
    if (typeof value === "number" && Number.isFinite(value)) return value;
  }
  return 0;
}

function truncate(text: string, max: number): string {
  if (text.length <= max) return text;
  return text.slice(0, max - 1) + "\u2026";
}

function isMarkdownFile(file: File) {
  const name = file.name.toLowerCase();
  return (
    name.endsWith(".md") ||
    name.endsWith(".markdown") ||
    file.type === "text/markdown"
  );
}

function fileBaseName(filename: string) {
  return filename.replace(/\.[^.]+$/, "");
}

function slugifyDocumentKey(input: string) {
  const slug = input
    .trim()
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, "-")
    .replace(/^-+|-+$/g, "");
  return slug || "document";
}

function titleizeFilename(input: string) {
  return input
    .split(/[-_ ]+/g)
    .filter(Boolean)
    .map((part) => part.charAt(0).toUpperCase() + part.slice(1))
    .join(" ");
}

function mergeOptimisticFeedbackVote(
  previousVotes: FeedbackVote[] | undefined,
  nextVote: {
    issueId: string;
    targetType: "issue_comment" | "issue_document_revision";
    targetId: string;
    vote: "up" | "down";
    reason?: string;
  },
  currentUserId: string | null,
): FeedbackVote[] {
  const now = new Date();
  const existingVotes = previousVotes ?? [];
  const existingIndex = existingVotes.findIndex(
    (feedbackVote) =>
      feedbackVote.targetType === nextVote.targetType &&
      feedbackVote.targetId === nextVote.targetId &&
      (!currentUserId || feedbackVote.authorUserId === currentUserId),
  );

  if (existingIndex >= 0) {
    const existingVote = existingVotes[existingIndex]!;
    const updatedVote: FeedbackVote = {
      ...existingVote,
      vote: nextVote.vote,
      reason:
        nextVote.reason !== undefined
          ? nextVote.reason.trim() || null
          : existingVote.reason,
      updatedAt: now,
    };
    const nextVotes = [...existingVotes];
    nextVotes[existingIndex] = updatedVote;
    return nextVotes;
  }

  return [
    ...existingVotes,
    {
      id: `optimistic:${nextVote.targetType}:${nextVote.targetId}`,
      companyId: "",
      issueId: nextVote.issueId,
      targetType: nextVote.targetType,
      targetId: nextVote.targetId,
      authorUserId: currentUserId ?? "current-user",
      vote: nextVote.vote,
      reason: nextVote.reason?.trim() || null,
      sharedWithLabs: false,
      sharedAt: null,
      consentVersion: null,
      redactionSummary: null,
      createdAt: now,
      updatedAt: now,
    },
  ];
}

function ActorIdentity({
  evt,
  agentMap,
  userProfileMap,
}: {
  evt: ActivityEvent;
  agentMap: Map<string, Agent>;
  userProfileMap?: Map<
    string,
    import("../lib/company-members").CompanyUserProfile
  >;
}) {
  const id = evt.actorId;
  if (evt.actorType === "agent") {
    const agent = agentMap.get(id);
    return <AgentIdentity agent={agent ?? { id, name: id.slice(0, 8) }} size="sm" />;
  }
  if (evt.actorType === "system") return <Identity name="System" size="sm" />;
  if (evt.actorType === "user") {
    const profile = userProfileMap?.get(id);
    return (
      <Identity
        name={profile?.label ?? "Board"}
        avatarUrl={profile?.image}
        size="sm"
      />
    );
  }
  return <Identity name={id || "Unknown"} size="sm" />;
}

export type AttributionActor = {
  appearance?: Agent["appearance"];
  kind: "agent" | "user";
  id: string;
  name: string;
  avatarUrl?: string | null;
};

function attributionInitials(name: string): string {
  const parts = name.trim().split(/\s+/);
  if (parts.length >= 2)
    return (parts[0][0] + parts[parts.length - 1][0]).toUpperCase();
  return name.slice(0, 2).toUpperCase();
}

function AttributionAvatar({
  label,
  actor,
  via,
}: {
  label: "Assignee" | "Originating";
  actor: AttributionActor;
  via?: string | null;
}) {
  const accessibleLabel = via
    ? `${label}: ${actor.name} · via ${via}`
    : `${label}: ${actor.name}`;
  const testIdLabel = label.toLowerCase();

  return (
    <Tooltip>
      <TooltipTrigger asChild>
        <span aria-label={accessibleLabel} data-testid={`issue-${testIdLabel}-avatar`}>
          {actor.kind === "agent" ? <AgentAvatar agent={actor} size={20} /> : (
            <Avatar size="xs" className="ring-2 ring-background">
              {actor.avatarUrl ? <AvatarImage src={actor.avatarUrl} alt="" /> : null}
              <AvatarFallback>{attributionInitials(actor.name)}</AvatarFallback>
            </Avatar>
          )}
        </span>
      </TooltipTrigger>
      <TooltipContent side="top" sideOffset={6} className="px-2 py-1.5">
        <div
          className="flex items-center gap-2"
          data-testid={`issue-${testIdLabel}-tooltip`}
        >
          {actor.kind === "agent" ? <AgentAvatar agent={actor} size={32} /> : (
            <Avatar size="sm" className="ring-1 ring-background/30">
              {actor.avatarUrl ? <AvatarImage src={actor.avatarUrl} alt="" /> : null}
              <AvatarFallback>{attributionInitials(actor.name)}</AvatarFallback>
            </Avatar>
          )}
          <div className="min-w-0">
            <div className="text-(length:--text-nano) font-medium uppercase leading-none text-background/70">
              {label}
            </div>
            <div className="max-w-48 truncate text-xs font-medium leading-4 text-background">
              {actor.name}
            </div>
            {via ? (
              <div className="max-w-48 truncate text-(length:--text-nano) leading-3 text-background/60">
                via {via}
              </div>
            ) : null}
          </div>
        </div>
      </TooltipContent>
    </Tooltip>
  );
}

function IssueAttributionByline({
  issue,
  agentMap,
  userProfileMap,
  userLabelMap,
}: {
  issue: Issue;
  agentMap: Map<string, Agent>;
  userProfileMap: ReadonlyMap<
    string,
    import("../lib/company-members").CompanyUserProfile
  >;
  userLabelMap: ReadonlyMap<string, string>;
}) {
  const assignee: AttributionActor | null = issue.assigneeAgentId
    ? {
        kind: "agent",
        id: issue.assigneeAgentId,
        appearance: agentMap.get(issue.assigneeAgentId)?.appearance,
        name:
          agentMap.get(issue.assigneeAgentId)?.name ??
          issue.assigneeAgentId.slice(0, 8),
      }
    : issue.assigneeUserId
      ? {
          kind: "user",
          id: issue.assigneeUserId,
          name:
            formatUserLabel(issue.assigneeUserId, userLabelMap) ??
            userProfileMap.get(issue.assigneeUserId)?.label ??
            "User",
          avatarUrl: userProfileMap.get(issue.assigneeUserId)?.image ?? null,
        }
      : null;
  const originatingActor = deriveOriginatingActor(issue);
  const originator: AttributionActor | null = originatingActor
    ? originatingActor.kind === "agent"
      ? {
          kind: "agent",
          id: originatingActor.id,
          appearance: agentMap.get(originatingActor.id)?.appearance,
          name:
            agentMap.get(originatingActor.id)?.name ??
            originatingActor.id.slice(0, 8),
        }
      : {
          kind: "user",
          id: originatingActor.id,
          name:
            formatUserLabel(originatingActor.id, userLabelMap) ??
            userProfileMap.get(originatingActor.id)?.label ??
            "User",
          avatarUrl: userProfileMap.get(originatingActor.id)?.image ?? null,
        }
    : null;
  const originatorVia =
    originatingActor?.kind === "user" && originatingActor.viaAgentId
      ? (agentMap.get(originatingActor.viaAgentId)?.name ??
        originatingActor.viaAgentId.slice(0, 8))
      : null;
  if (!assignee && !originator) return null;

  return (
    <TooltipProvider>
      <AvatarGroup
        className="-space-x-1.5"
        aria-label="Task people"
        data-testid="issue-attribution-avatar-stack"
      >
        {assignee ? (
          <AttributionAvatar label="Assignee" actor={assignee} />
        ) : null}
        {originator ? (
          <AttributionAvatar
            label="Originating"
            actor={originator}
            via={originatorVia}
          />
        ) : null}
      </AvatarGroup>
    </TooltipProvider>
  );
}

function IssueSectionSkeleton({
  titleWidth = "w-28",
  rows = 3,
}: {
  titleWidth?: string;
  rows?: number;
}) {
  return (
    <div className="space-y-3 rounded-lg border border-border p-3">
      <Skeleton className={cn("h-4", titleWidth)} />
      <div className="space-y-2">
        {Array.from({ length: rows }).map((_, index) => (
          <Skeleton key={index} className="h-12 w-full rounded-md" />
        ))}
      </div>
    </div>
  );
}

/**
 * One chat-bubble placeholder mirroring TaskChatBubble's anatomy: agent replies
 * sit left under an avatar + name author row, human messages sit right with no
 * header. The bubble reuses the real rounding (rounded-2xl with a squared tail
 * corner) so the skeleton reads as a conversation, not a stack of cards.
 */
function ChatBubbleSkeleton({
  side,
  className,
}: {
  side: "agent" | "human";
  className?: string;
}) {
  const isHuman = side === "human";
  return (
    <div
      className={cn(
        "flex w-full flex-col gap-1",
        isHuman ? "items-end" : "items-start",
      )}
    >
      {isHuman ? null : (
        <span className="flex items-center gap-2 px-1">
          <Skeleton className="h-6 w-6 rounded-full" />
          <Skeleton className="h-3 w-24" />
        </span>
      )}
      <Skeleton
        className={cn(
          "max-w-(--pct-85)",
          isHuman ? "rounded-2xl rounded-br-sm" : "rounded-2xl rounded-bl-sm",
          className,
        )}
      />
    </div>
  );
}

/**
 * Composer placeholder mirroring TaskChatComposer's docked card (a bordered
 * rounded input area with a plus, a mode chip, and a send affordance) so the
 * foot of the loading state matches the real chat shell.
 */
function IssueChatComposerSkeleton({ className }: { className?: string }) {
  return (
    <div
      className={cn("rounded-xl border border-input bg-card p-2", className)}
      data-testid="issue-chat-composer-skeleton"
    >
      <div className="min-h-(--sz-48px) space-y-2 px-1 py-1">
        <Skeleton className="h-3 w-1/2" />
        <Skeleton className="h-3 w-1/3" />
      </div>
      <div className="mt-1 flex items-center gap-2">
        <Skeleton className="h-8 w-8 rounded-md" />
        <Skeleton className="h-8 w-24 rounded-md" />
        <div className="flex-1" />
        <Skeleton className="h-8 w-8 rounded-md" />
      </div>
    </div>
  );
}

/**
 * Alternating chat-bubble placeholders for the thread body. Widths and heights
 * vary so the skeleton mirrors a real back-and-forth (TaskChatThreadView)
 * rather than the pre-chat bordered card it replaced.
 */
function IssueChatSkeleton() {
  return (
    <div className="flex flex-col gap-3" data-testid="issue-chat-skeleton">
      <ChatBubbleSkeleton side="agent" className="h-16 w-3/4" />
      <ChatBubbleSkeleton side="human" className="h-9 w-1/2" />
      <ChatBubbleSkeleton side="agent" className="h-24 w-4/5" />
      <ChatBubbleSkeleton side="human" className="h-8 w-2/5" />
    </div>
  );
}

function useTaskDetailInterfaceMode(conversationMode = false) {
  const {
    enabled: classicTaskInterfacePreferenceEnabled,
    loaded: classicTaskInterfaceLoaded,
  } = useClassicTaskInterfaceEnabled();
  const { enabled: classicStreamlinedUiEnabled, loaded: streamlinedUiLoaded } =
    useStreamlinedUiEnabled();
  const { enabled: coordinatorWorkspaceEnabled, loaded: coordinatorLoaded } = useCoordinatorWorkspaceEnabled();
  const streamlinedUiEnabled = classicStreamlinedUiEnabled || coordinatorWorkspaceEnabled;
  const classicTaskInterfaceEnabled = classicTaskInterfacePreferenceEnabled && !conversationMode && !coordinatorWorkspaceEnabled;
  const taskChatShellEnabled = !classicTaskInterfaceEnabled;

  return {
    coordinatorWorkspaceEnabled,
    classicTaskInterfaceEnabled,
    taskChatShellEnabled,
    streamlinedTaskDetailEnabled: streamlinedUiEnabled && taskChatShellEnabled,
    streamlinedUiEnabled,
    loaded: classicTaskInterfaceLoaded && streamlinedUiLoaded && coordinatorLoaded,
  };
}

export function IssueDetailLoadingState({
  headerSeed,
  titleEditor,
}: {
  headerSeed: ReturnType<typeof readIssueDetailHeaderSeed>;
  titleEditor?: React.ReactNode;
}) {
  const identifier =
    headerSeed?.identifier ?? headerSeed?.id.slice(0, 8) ?? null;
  const { taskChatShellEnabled } = useTaskDetailInterfaceMode();

  return (
    <div
      className={
        taskChatShellEnabled
          ? "task-chat-loading-shell mx-auto flex min-h-0 w-full max-w-(--tc-shell-max-w) flex-1 flex-col gap-6"
          : "max-w-3xl space-y-6"
      }
    >
      <div className="space-y-3" data-testid={titleEditor ? "issue-detail-header" : undefined}>
        <Skeleton className="h-3 w-40" />

        <div className="flex items-center gap-2 min-w-0 flex-wrap">
          {headerSeed ? (
            <>
              <StatusIcon
                status={headerSeed.status}
                blockerAttention={headerSeed.blockerAttention}
              />
              {/* PAP-411: priority UI hidden behind SHOW_TASK_PRIORITY_UI. */}
              {SHOW_TASK_PRIORITY_UI && (
                <PriorityIcon priority={headerSeed.priority} />
              )}
              {identifier ? (
                <span className="text-sm font-mono text-muted-foreground shrink-0">
                  {identifier}
                </span>
              ) : null}
              {headerSeed.originKind === "routine_execution" &&
              headerSeed.originId ? (
                <Badge
                  variant="outline"
                  className="border-violet-500/30 bg-violet-500/10 text-(length:--text-nano) text-violet-600 dark:text-violet-400"
                  title={`Routine execution from routine ${headerSeed.originId}`}
                >
                  <Repeat className="h-3 w-3" />
                  Routine
                </Badge>
              ) : null}
              {/* Seeded header — same anatomy as the resolved one below, so the
                  eyebrow does not change shape when the real issue arrives. */}
              {headerSeed.projectId ? (
                <span className="inline-flex items-center gap-1 text-xs text-muted-foreground rounded px-1 -mx-1 py-0.5 min-w-0">
                  <ProjectTile size="xs" />
                  <span className="truncate">
                    {headerSeed.projectName ?? headerSeed.projectId.slice(0, 8)}
                  </span>
                </span>
              ) : (
                <span className="inline-flex items-center gap-1 text-xs text-muted-foreground opacity-50 px-1 -mx-1 py-0.5">
                  <ProjectTile size="xs" />
                  No project
                </span>
              )}
            </>
          ) : (
            <>
              <Skeleton className="h-6 w-6" />
              <Skeleton className="h-6 w-6" />
              <Skeleton className="h-4 w-20" />
              <Skeleton className="h-4 w-28" />
            </>
          )}
        </div>

        {headerSeed ? (
          <>
            {titleEditor ?? <h2 className="text-xl font-bold leading-tight">
              {headerSeed.title}
            </h2>}
            <div className="space-y-2">
              <Skeleton className="h-4 w-full max-w-xl" />
              <Skeleton className="h-4 w-(--pct-72)" />
            </div>
          </>
        ) : (
          <>
            <Skeleton className="h-8 w-(--sz-calc-37)" />
            <Skeleton className="h-16 w-full" />
          </>
        )}
      </div>

      {taskChatShellEnabled ? (
        // Chat shell: the thread is the whole surface — alternating bubble
        // placeholders followed by the docked composer, no tab strip or
        // properties-card chrome (those don't exist in the chat layout).
        <div className="flex min-h-0 flex-1 flex-col justify-between gap-6 overflow-hidden">
          <IssueChatSkeleton />
          <IssueChatComposerSkeleton />
        </div>
      ) : (
        <>
          <Skeleton className="h-28 w-full rounded-lg border border-border" />

          <div className="space-y-3">
            <div className="flex items-center gap-2">
              <Skeleton className="h-8 w-20" />
              <Skeleton className="h-8 w-20" />
            </div>
            <IssueChatSkeleton />
          </div>

          <IssueSectionSkeleton titleWidth="w-24" rows={3} />
        </>
      )}
    </div>
  );
}

interface InboxMobileToolbarProps {
  backHref: string;
  preferHistoryBack: boolean;
  issueId: string | undefined;
  issueHidden: boolean;
  onArchive: () => void;
  archivePending: boolean;
  onCopy: () => void;
  onProperties: () => void;
  onHide: () => void;
}

function InboxMobileToolbar({
  backHref,
  preferHistoryBack,
  issueId: issueIdProp,
  issueHidden,
  onArchive,
  archivePending,
  onCopy,
  onProperties,
  onHide,
}: InboxMobileToolbarProps) {
  const navigate = useNavigate();
  const [menuOpen, setMenuOpen] = useState(false);

  return (
    <div className="flex items-center w-full">
      <Button
        variant="ghost"
        size="icon-sm"
        onClick={() => {
          // Use browser back when we have real history so the inbox
          // restores its scroll position. Fall back to a PUSH to
          // backHref when there's no prior entry (e.g. deep-link).
          if (preferHistoryBack && window.history.length > 1) {
            navigate(-1);
          } else {
            navigate(backHref);
          }
        }}
        aria-label="Back to inbox"
      >
        <ArrowLeft className="h-5 w-5" />
      </Button>

      <div className="ml-auto flex items-center gap-0.5">
        {issueIdProp && !issueHidden && (
          <Button
            variant="ghost"
            size="icon-sm"
            onClick={onArchive}
            disabled={archivePending}
            aria-label="Archive from inbox"
          >
            <Archive className="h-5 w-5" />
          </Button>
        )}

        <Popover open={menuOpen} onOpenChange={setMenuOpen}>
          <PopoverTrigger asChild>
            <Button variant="ghost" size="icon-sm" aria-label="More actions">
              <MoreVertical className="h-5 w-5" />
            </Button>
          </PopoverTrigger>
          <PopoverContent className="w-44 p-1" align="end">
            <button
              className="flex items-center gap-2 w-full px-2 py-1.5 text-xs rounded hover:bg-accent/50"
              onClick={() => {
                onCopy();
                setMenuOpen(false);
              }}
            >
              <Copy className="h-3 w-3" />
              Copy as markdown
            </button>
            <button
              className="flex items-center gap-2 w-full px-2 py-1.5 text-xs rounded hover:bg-accent/50"
              onClick={() => {
                onProperties();
                setMenuOpen(false);
              }}
            >
              <SlidersHorizontal className="h-3 w-3" />
              Properties
            </button>
            {issueIdProp && (
              <button
                className="flex items-center gap-2 w-full px-2 py-1.5 text-xs rounded hover:bg-accent/50 text-destructive"
                onClick={() => {
                  onHide();
                  setMenuOpen(false);
                }}
              >
                <EyeOff className="h-3 w-3" />
                Hide this task
              </button>
            )}
          </PopoverContent>
        </Popover>
      </div>
    </div>
  );
}

interface RecentIssueRunWindow {
  runs: RunForIssue[];
  hasEarlierRuns: boolean;
}

type IssueDetailChatTabProps = {
  executionBlocked?: boolean;
  interruption?: Issue["interruption"];
  retryPreparing?: boolean;
  queryIssueId?: string;
  hasLiveConnection: boolean;
  browsers?: import("@paperclipai/shared").TaskBrowser[];
  onOpenBrowser?: (browserId: string) => void;
  onOpenSkill?: (skillId: string, name: string) => void;
  issueId: string;
  companyId: string;
  projectId: string | null;
  issueStatus: Issue["status"];
  /** Marks cross-issue agent comments in the thread (the open cross-task write design (attribution)). */
  issueAssigneeAgentId: Issue["assigneeAgentId"];
  issueWorkMode: IssueWorkMode;
  executionRunId: string | null;
  blockedBy: Issue["blockedBy"];
  liveIssueIds: ReadonlySet<string>;
  blockerAttention: Issue["blockerAttention"] | null;
  successfulRunHandoff: Issue["successfulRunHandoff"] | null;
  scheduledRetry: Issue["scheduledRetry"] | null;
  recoveryAction: Issue["activeRecoveryAction"];
  onResolveRecoveryAction?: (
    outcome: import("../components/IssueRecoveryActionCard").RecoveryResolveOutcome,
  ) => void;
  onReissueIsolatedRecoveryAction?: (
    request: import("../components/IssueRecoveryActionCard").RecoveryReissueRequest,
  ) => void;
  reissueIsolatedRecoveryActionPending?: boolean;
  onReconcileForwardRecoveryAction?: () => void;
  onBreakGlassOverrideRecoveryAction?: (reason: string) => void;
  onQuarantineRestoreRecoveryAction?: () => void;
  quarantineRestoreRecoveryActionPending?: boolean;
  canBreakGlassRecoveryAction?: boolean;
  reconcileRecoveryActionPending?: boolean;
  canFalsePositiveRecoveryAction?: boolean;
  legacyRecoverySourceIssue?: {
    identifier: string | null;
    href: string;
    title?: string | null;
  } | null;
  comments: IssueDetailComment[];
  commentsInitialLoading?: boolean;
  historyExpanded?: boolean;
  onExpandHistory?: () => void;
  hasEarlierMessages?: boolean;
  initialHistoryPending?: boolean;
  initialMetadataPending?: boolean;
  initialHistoryError?: boolean;
  onRetryInitialHistory?: () => void;
  locallyQueuedCommentRunIds: ReadonlyMap<string, string>;
  interactions: IssueThreadInteraction[];
  documents: IssueDocumentSummary[];
  workProducts: IssueWorkProduct[];
  attachments: IssueAttachment[];
  hasOlderComments: boolean;
  commentsLoadingOlder: boolean;
  commentsOlderError?: boolean;
  onLoadOlderComments: () => void;
  onRefreshLatestComments: () => Promise<unknown> | void;
  onWorkModeChange?: (workMode: IssueWorkMode) => Promise<void> | void;
  composerRef: Ref<IssueChatComposerHandle>;
  /** Optional node rendered inline directly above the reply composer (e.g. the monitor strip). */
  composerAccessory?: ReactNode;
  /**
   * Issue header (title row, badges, plugin toolbars) that the chat-style
   * thread renders inside its scroll viewport so it scrolls away with the
   * messages. Ignored by the classic thread (flag: enableClassicTaskInterface).
   */
  threadHeader?: ReactNode;
  /**
   * The task description rendered as the requester's first chat bubble in the
   * chat-style thread (PAP-375). Ignored by the classic thread.
   */
  issueBrief?: TaskChatIssueBrief;
  footer?: ReactNode;
  feedbackVotes?: FeedbackVote[];
  feedbackDataSharingPreference: "allowed" | "not_allowed" | "prompt";
  feedbackTermsUrl: string | null;
  agentMap: Map<string, Agent>;
  currentUserId: string | null;
  userLabelMap: ReadonlyMap<string, string> | null;
  userProfileMap: ReadonlyMap<
    string,
    import("../lib/company-members").CompanyUserProfile
  > | null;
  draftKey: string;
  reassignOptions: Array<{ id: string; label: string; searchText?: string }>;
  currentAssigneeValue: string;
  assigneeAdapterOverrides?: Issue["assigneeAdapterOverrides"];
  suggestedAssigneeValue: string;
  mentions: MentionOption[];
  conversationMode?: boolean;
  composerPause?: TaskComposerPause | null;
  composerDisabledReason: string | null;
  composerHint: string | null;
  queuedCommentReason: "hold" | "active_run" | "other";
  onVote: (
    commentId: string,
    vote: "up" | "down",
    options?: { allowSharing?: boolean; reason?: string },
  ) => Promise<void>;
  onAdd: (
    body: string,
    reopen?: boolean,
    reassignment?: CommentReassignment,
    attachmentIds?: string[],
    clientRequestId?: string,
    runSettings?: ComposerRunSettings,
  ) => Promise<void>;
  onImageUpload: (file: File) => Promise<string>;
  onAttachImage: (file: File) => Promise<IssueAttachment | void>;
  onInterruptQueued: (runId: string | null) => Promise<IssueQueuedCommentQueue | void>;
  onRemoveCommentFromCache: (commentId: string) => Promise<void>;
  onDeleteComment?: (commentId: string) => Promise<void> | void;
  onPauseWorkRun?: (runId: string, feedback?: "composer") => Promise<void>;
  onStopResponse?: (runId: string) => Promise<void>;
  stopResponsePending?: boolean;
  pauseWorkPending?: boolean;
  pauseWorkScope?: "leaf" | "subtree";
  runFinalizationActions?: readonly IssueChatRunFinalizationAction[];
  onCancelQueued: (commentId: string) => void;
  interruptingQueuedRunId: string | null;
  pausingWorkRunId: string | null;
  onImageClick: (src: string) => void;
  onAcceptInteraction: (
    interaction: ActionableIssueThreadInteraction,
    selectedClientKeys?: string[],
    selectedOptionIds?: string[],
    rememberAction?: boolean,
  ) => Promise<void>;
  onRejectInteraction: (
    interaction: ActionableIssueThreadInteraction,
    reason?: string,
  ) => Promise<void>;
  onSubmitInteractionAnswers: (
    interaction: IssueThreadInteraction,
    answers: AskUserQuestionsAnswer[],
  ) => Promise<void>;
  onCancelInteraction: (
    interaction: AskUserQuestionsInteraction,
  ) => Promise<void>;
  onSkipInteraction: (interaction: IssueThreadInteraction) => Promise<void>;
  onDismissInteraction: (interaction: IssueThreadInteraction) => Promise<void>;
  onSubmitInteractionVerdicts: (
    interaction: RequestItemVerdictsInteraction,
    verdicts: {
      id: string;
      verdict: RequestItemVerdictValue;
      reason?: string;
    }[],
  ) => Promise<void>;
  assigneeUserId: string | null;
  onResumeFromBacklog?: () => Promise<void> | void;
  resumeFromBacklogPending?: boolean;
  onResumeAssignee?: () => Promise<void> | void;
  resumeAssigneePending?: boolean;
  onTryAgainNoLiveExecutionPath?: () => Promise<void> | void;
  tryAgainNoLiveExecutionPathPending?: boolean;
  externalReferences?: MarkdownExternalReferenceMap;
  linkCaseReferences?: boolean;
};

const DesignSandboxTaskThread = lazy(() => import("../components/design-sandbox/DesignSandboxTaskThread"));

const IssueDetailChatTab = memo(function IssueDetailChatTab({
  executionBlocked,
  interruption,
  retryPreparing,
  queryIssueId,
  hasLiveConnection,
  browsers,
  onOpenBrowser,
  onOpenSkill,
  issueId,
  companyId,
  projectId,
  issueWorkMode,
  issueStatus,
  issueAssigneeAgentId,
  executionRunId,
  blockedBy,
  liveIssueIds,
  blockerAttention,
  successfulRunHandoff,
  scheduledRetry,
  recoveryAction,
  onResolveRecoveryAction,
  onReissueIsolatedRecoveryAction,
  reissueIsolatedRecoveryActionPending,
  onReconcileForwardRecoveryAction,
  onBreakGlassOverrideRecoveryAction,
  onQuarantineRestoreRecoveryAction,
  quarantineRestoreRecoveryActionPending,
  canBreakGlassRecoveryAction,
  reconcileRecoveryActionPending,
  canFalsePositiveRecoveryAction,
  legacyRecoverySourceIssue,
  comments,
  commentsInitialLoading = false,
  historyExpanded = true,
  onExpandHistory,
  hasEarlierMessages = false,
  initialHistoryPending = false,
  initialMetadataPending = false,
  initialHistoryError = false,
  onRetryInitialHistory,
  locallyQueuedCommentRunIds,
  interactions,
  documents,
  workProducts,
  attachments,
  hasOlderComments,
  commentsLoadingOlder,
  commentsOlderError = false,
  onLoadOlderComments,
  onRefreshLatestComments,
  onWorkModeChange,
  composerRef,
  composerAccessory,
  threadHeader,
  issueBrief,
  footer,
  feedbackVotes,
  feedbackDataSharingPreference,
  feedbackTermsUrl,
  agentMap,
  currentUserId,
  userLabelMap,
  userProfileMap,
  draftKey,
  reassignOptions,
  currentAssigneeValue,
  assigneeAdapterOverrides,
  suggestedAssigneeValue,
  mentions,
  conversationMode,
  composerPause,
  composerDisabledReason,
  composerHint,
  queuedCommentReason,
  onVote,
  onAdd,
  onImageUpload,
  onAttachImage,
  onInterruptQueued,
  onRemoveCommentFromCache,
  onDeleteComment,
  onPauseWorkRun,
  onStopResponse,
  stopResponsePending,
  pauseWorkPending,
  pauseWorkScope,
  runFinalizationActions,
  onCancelQueued,
  interruptingQueuedRunId,
  pausingWorkRunId,
  onImageClick,
  onAcceptInteraction,
  onRejectInteraction,
  onSubmitInteractionAnswers,
  onCancelInteraction,
  onSkipInteraction,
  onDismissInteraction,
  onSubmitInteractionVerdicts,
  assigneeUserId,
  onResumeFromBacklog,
  resumeFromBacklogPending,
  onResumeAssignee,
  resumeAssigneePending,
  onTryAgainNoLiveExecutionPath,
  tryAgainNoLiveExecutionPathPending,
  externalReferences,
  linkCaseReferences,
}: IssueDetailChatTabProps) {
  // Preserve master's Classic Task Interface seam: Streamlined UI changes the
  // TaskChatThread presentation but never swaps it for IssueChatThread.
  const { classicTaskInterfaceEnabled, streamlinedTaskDetailEnabled } =
    useTaskDetailInterfaceMode(!!conversationMode);
  const ThreadComponent = classicTaskInterfaceEnabled
    ? IssueChatThread
    : TaskChatThread;
  const designSandbox = useDesignSandbox();
  const queryClient = useQueryClient();
  const issueQueryRef = queryIssueId ?? issueId;
  const scrollLocation = useLocation();
  const scrollNavigationType = useNavigationType();
  const { pushToast } = useToastActions();
  const {
    data: activity,
    isPending: activityPending,
    isError: activityError,
    refetch: refetchActivity,
  } = useQuery({
    queryKey: historyExpanded ? queryKeys.issues.activity(issueQueryRef) : [...queryKeys.issues.activity(issueQueryRef), "recent"],
    queryFn: async () => {
      if (historyExpanded) return activityApi.forIssue(issueQueryRef);
      const recent = await activityApi.recentForIssue(issueQueryRef);
      const previous = queryClient.getQueryData<ActivityEvent[]>([...queryKeys.issues.activity(issueQueryRef), "recent"]) ?? [];
      return [...new Map([...previous, ...recent].map((event) => [event.id, event])).values()];
    },
    enabled: !!issueId,
    placeholderData: historyExpanded
      ? queryClient.getQueryData<ActivityEvent[]>([...queryKeys.issues.activity(issueQueryRef), "recent"])
      : undefined,
  });
  const inputCommentIds = comments.filter((comment) => !("clientStatus" in comment) || !comment.clientStatus).map((comment) => comment.id).sort();
  const inputFacts = useIssueIdBatches(
    [...queryKeys.issues.activity(issueQueryRef), "comment-inputs"], inputCommentIds,
    ids => activityApi.inputFactsForIssue(issueQueryRef, ids), !!issueId && !historyExpanded,
  );
  const {
    data: liveRuns,
    isFetched: liveRunsFetched,
    isError: liveRunsError,
    refetch: refetchLiveRuns,
  } = useQuery({
    queryKey: queryKeys.issues.liveRuns(issueQueryRef),
    queryFn: () => heartbeatsApi.liveRunsForIssue(issueQueryRef),
    enabled: !!issueId,
    refetchInterval: (query) => liveRunRefetchInterval(hasLiveConnection, query.state, 1000),
    placeholderData:
      keepPreviousDataForSameQueryTail<LiveRunForIssue[]>(issueQueryRef),
  });
  const resolvedLiveRuns = liveRuns ?? [];
  const liveRunCount = resolvedLiveRuns.length;
  const activeRunQueryEnabled =
    !!executionRunId || issueStatus === "in_progress";
  const {
    data: activeRun = null,
    isFetched: activeRunFetched,
    isError: activeRunError,
    refetch: refetchActiveRun,
  } = useQuery({
    queryKey: queryKeys.issues.activeRun(issueQueryRef),
    queryFn: () => heartbeatsApi.activeRunForIssue(issueQueryRef),
    enabled: activeRunQueryEnabled,
    refetchInterval: (query) => liveRunCount > 0 ? false : liveRunRefetchInterval(hasLiveConnection, query.state, 1000),
    placeholderData: keepPreviousDataForSameQueryTail<ActiveRunForIssue | null>(
      issueQueryRef,
    ),
  });
  const resolvedActiveRun = useMemo(
    () =>
      resolveIssueActiveRun({ status: issueStatus, executionRunId }, activeRun, liveRuns),
    [activeRun, executionRunId, issueStatus, liveRuns],
  );
  const assigneeUsesPaperclipRunner = Boolean(
    issueAssigneeAgentId &&
    agentMap.get(issueAssigneeAgentId)?.adapterType === "paperclip_runner",
  );
  const liveRuntimeRun =
    resolvedActiveRun ??
    resolvedLiveRuns.find(
      (run) => run.status === "running" || run.status === "queued",
    ) ??
    null;
  // Do not briefly select queue behavior from the current assignee while the
  // authoritative active-run lookup is still loading. The active runtime owns
  // the protocol: native Paperclip turns can steer in place, while legacy
  // adapters expose the same composer queue with an interrupt fallback.
  const runtimeSelectionKnown =
    liveRunsFetched && (!activeRunQueryEnabled || activeRunFetched);
  const queuedCommentQueueEnabled =
    !classicTaskInterfaceEnabled &&
    runtimeSelectionKnown &&
    Boolean(liveRuntimeRun || issueAssigneeAgentId);
  const { data: authoritativeQueuedCommentQueue } = useQuery({
    queryKey: queryKeys.issues.queuedComments(issueId),
    queryFn: async () =>
      normalizeIssueQueuedCommentQueue(
        await issuesApi.getQueuedComments(issueId),
        issueId,
      ),
    enabled: queuedCommentQueueEnabled,
    refetchInterval: (query) => queuedCommentQueueEnabled &&
      (liveRuntimeRun || query.state.data?.entries.length) ? 1000 : false,
  });
  const [consumedQueuedCommentIds, setConsumedQueuedCommentIds] = useState<
    ReadonlySet<string>
  >(() => new Set());
  const [discardedQueuedCommentIds, setDiscardedQueuedCommentIds] = useState<
    ReadonlySet<string>
  >(() => new Set());
  const [localSteeringPlacements, setLocalSteeringPlacements] = useState<
    ReadonlyMap<
      string,
      {
        targetRunId: string;
        anchorAt: string;
        sequence: number;
        comment?: IssueDetailComment;
      }
    >
  >(() => new Map());
  const [localInterruptPlacements, setLocalInterruptPlacements] = useState<
    ReadonlyMap<
      string,
      { anchorAt: string; sequence: number; comment?: IssueDetailComment }
    >
  >(() => new Map());
  const [classicQueuedDeliveryError, setClassicQueuedDeliveryError] =
    useState<string | null>(null);
  useEffect(() => {
    setConsumedQueuedCommentIds(new Set());
    setDiscardedQueuedCommentIds(new Set());
  }, [issueId]);
  useEffect(() => {
    setLocalSteeringPlacements(new Map());
    setLocalInterruptPlacements(new Map());
    setClassicQueuedDeliveryError(null);
  }, [issueId]);
  const hasLiveRuns = liveRunCount > 0 || !!resolvedActiveRun;
  const linkedRunsKey = historyExpanded
    ? queryKeys.issues.runs(issueQueryRef)
    : [...queryKeys.issues.runs(issueQueryRef), "recent-window"];
  const {
    data: linkedRunHistory,
    isPending: linkedRunsPending,
    isError: linkedRunsError,
    refetch: refetchLinkedRuns,
  } = useQuery<RunForIssue[] | RecentIssueRunWindow>({
    queryKey: linkedRunsKey,
    queryFn: async () => {
      if (historyExpanded) return activityApi.runsForIssue(issueQueryRef);
      let recent = await activityApi.recentRunsForIssue(issueQueryRef);
      const previousWindow = queryClient.getQueryData<RecentIssueRunWindow>(linkedRunsKey);
      let previous = previousWindow?.runs ?? [];
      let reconciledFullHistory = false;
      if (previous.some((run) =>
        (run.status === "running" || run.status === "queued") && !recent.some((next) => next.runId === run.runId),
      )) {
        // After a reconnect, several turns may have completed beyond the small
        // window. Reconcile watched runs once against authoritative summaries.
        recent = conversationMode
          ? await activityApi.runsByIdsForIssue(issueQueryRef, [...new Set([...previous.map(run => run.runId), ...recent.map(run => run.runId)])])
          : await activityApi.runsForIssue(issueQueryRef);
        reconciledFullHistory = true;
        const existingRunIds = new Set(recent.map((run) => run.runId));
        previous = previous.filter((run) => existingRunIds.has(run.runId));
      }
      // The second row refreshes a just-finished predecessor. Start with only
      // the latest run, then keep every run observed while this task is open.
      const visible = new Set([...previous.map((run) => run.runId), ...recent.slice(0, 1).map((run) => run.runId)]);
      return {
        runs: [...new Map([...previous, ...recent].filter((run) => visible.has(run.runId)).map((run) => [run.runId, run])).values()],
        // A first run is already visible. The disclosure needs evidence of an
        // omitted run, and must retain that evidence as later turns arrive.
        hasEarlierRuns: recent.some((run) => !visible.has(run.runId))
          || (!reconciledFullHistory && recent.length >= 2 && previousWindow?.hasEarlierRuns === true),
      };
    },
    enabled: !!issueId,
    refetchInterval:
      hasLiveRuns || issueStatus === "in_progress" ? 1000 : false,
    placeholderData: historyExpanded ? queryClient.getQueryData<RecentIssueRunWindow>([...queryKeys.issues.runs(issueQueryRef), "recent-window"])?.runs : undefined,
  });
  const observedRunIds = useMemo(() => [...new Set([
    ...comments.flatMap(comment => [comment.createdByRunId, comment.derivedCreatedByRunId]),
    ...(inputFacts.data ?? []).flatMap(event => [event.runId, event.details?.targetRunId]),
  ].filter((id): id is string => typeof id === "string" && isUuidLike(id)))].sort(), [comments, inputFacts.data]);
  const commentRuns = useIssueIdBatches(
    [...queryKeys.issues.runs(issueQueryRef), "comment-window"], observedRunIds,
    ids => activityApi.runsByIdsForIssue(issueQueryRef, ids), !!issueId && !!conversationMode && !historyExpanded,
  );
  const linkedRuns = useMemo(() => [...new Map([
    ...(Array.isArray(linkedRunHistory) ? linkedRunHistory : linkedRunHistory?.runs ?? []),
    ...(conversationMode && !historyExpanded ? commentRuns.data ?? [] : []),
  ].map(run => [run.runId, run])).values()], [linkedRunHistory, conversationMode, historyExpanded, commentRuns.data]);
  const hasEarlierRuns = !Array.isArray(linkedRunHistory) && linkedRunHistory?.hasEarlierRuns === true;
  const resolvedActivity = useMemo(
    () => [...new Map([...(activity ?? []), ...(inputFacts.data ?? [])].map((event) => [event.id, event])).values()],
    [activity, inputFacts.data],
  );
  const resolvedLinkedRuns = linkedRuns ?? [];
  useEffect(() => {
    recordIssueDetailReadiness({ activity: !activityPending, "linked-runs": !linkedRunsPending, runtime: runtimeSelectionKnown });
  }, [issueId, issueQueryRef, activityPending, linkedRunsPending, runtimeSelectionKnown]);
  const retryFailedRun = useMutation({
    mutationFn: async (runId: string) => {
      const failedRun = resolvedLinkedRuns.find((run) => run.runId === runId);
      if (!failedRun) throw new Error("Failed run is no longer available.");
      return agentsApi.retryFailedRun(
        failedRun.agentId,
        failedRun.runId,
        companyId,
      );
    },
    onSuccess: (result) => {
      if (!result.runId) {
        pushToast({
          title: "Retry queued",
          body: "The exact request will retry when this task is ready.",
          tone: "success",
        });
      }
    },
    onSettled: () => {
      queryClient.invalidateQueries({
        queryKey: queryKeys.issues.runs(issueQueryRef),
      });
      queryClient.invalidateQueries({
        queryKey: queryKeys.issues.liveRuns(issueQueryRef),
      });
      queryClient.invalidateQueries({
        queryKey: queryKeys.issues.activeRun(issueQueryRef),
      });
    },
    onError: (error) => {
      pushToast({
        title: "Run retry failed",
        body: error instanceof Error ? error.message : "Unable to retry run",
        tone: "error",
      });
    },
  });

  const interruptibleIssueRun = useMemo(
    () => resolveInterruptibleIssueRun(resolvedActiveRun, resolvedLiveRuns),
    [resolvedActiveRun, resolvedLiveRuns],
  );
  const currentRunAgent = interruptibleIssueRun ? agentMap.get(interruptibleIssueRun.agentId) : null;
  const grokWork = currentRunAgent?.adapterType === "paperclip_runner" && currentRunAgent.adapterConfig.provider === "grok_bot";
  const stopGrokWork = useMutation({
    mutationFn: (run: { id: string; agentId: string }) => grokBotApi.stop(companyId, run.agentId, run.id),
    onSettled: (_data, _error, run) => Promise.all([
      queryClient.invalidateQueries({ queryKey: queryKeys.issues.detail(issueId) }),
      queryClient.invalidateQueries({ queryKey: queryKeys.issues.runs(issueId) }),
      queryClient.invalidateQueries({ queryKey: ["grok-binding", companyId, run.agentId] }),
    ]),
  });
  const liveRunIds = useMemo(() => {
    const ids = new Set<string>();
    for (const run of resolvedLiveRuns) ids.add(run.id);
    if (resolvedActiveRun) ids.add(resolvedActiveRun.id);
    return ids;
  }, [resolvedActiveRun, resolvedLiveRuns]);
  const timelineRuns = useMemo(() => {
    const historicalRuns =
      liveRunIds.size === 0
        ? resolvedLinkedRuns
        : resolvedLinkedRuns.filter((run) => !liveRunIds.has(run.runId));
    return historicalRuns.map((run) => ({
      ...run,
      adapterType: run.adapterType,
      hasStoredOutput: (run.logBytes ?? 0) > 0,
    }));
  }, [liveRunIds, resolvedLinkedRuns]);
  const commentsWithRunMeta = useMemo<IssueDetailComment[]>(() => {
    const activeRunStartedAt =
      interruptibleIssueRun?.startedAt ??
      interruptibleIssueRun?.createdAt ??
      null;
    const runMetaByCommentId = new Map<
      string,
      {
        runId: string;
        runAgentId: string | null;
        interruptedRunId: string | null;
      }
    >();
    const followUpCommentIds = new Set<string>();
    const agentIdByRunId = new Map<string, string>();
    const inputPlacementByCommentId = new Map<
      string,
      {
        runId: string;
        anchorAt: string;
        sequence: number;
        anchorMs: number;
        kind: "run_start" | "steer";
        queueIds: Set<string>;
      }
    >();

    for (const run of resolvedLinkedRuns) {
      agentIdByRunId.set(run.runId, run.agentId);
      if (run.status === "queued" || !run.startedAt) continue;
      const batchedIds = Array.isArray(run.wakeCommentIds)
        ? run.wakeCommentIds.filter(
            (value): value is string =>
              typeof value === "string" && value.length > 0,
          )
        : [];
      const fallbackId =
        typeof run.wakeCommentId === "string" && run.wakeCommentId.length > 0
          ? run.wakeCommentId
          : typeof run.contextCommentId === "string" &&
              run.contextCommentId.length > 0
            ? run.contextCommentId
            : null;
      const inputIds =
        batchedIds.length > 0 ? batchedIds : fallbackId ? [fallbackId] : [];
      const anchorAt = run.startedAt ?? run.createdAt;
      const anchorMs = new Date(anchorAt).getTime();
      inputIds.forEach((commentId, sequence) => {
        const existing = inputPlacementByCommentId.get(commentId);
        const queueIds = existing?.queueIds ?? new Set<string>();
        if (run.wakeupRequestId) queueIds.add(run.wakeupRequestId);
        if (Array.isArray(run.queuedCommentSourceWakeIds)) {
          for (const queueId of run.queuedCommentSourceWakeIds) queueIds.add(queueId);
        }
        if (existing && existing.anchorMs <= anchorMs) return;
        inputPlacementByCommentId.set(commentId, {
          runId: run.runId,
          anchorAt,
          sequence,
          anchorMs,
          kind: "run_start",
          queueIds,
        });
      });
    }
    for (const run of [resolvedActiveRun, ...resolvedLiveRuns]) {
      if (!run || run.status !== "running" || !run.startedAt) continue;
      const anchorAt = new Date(run.startedAt).toISOString();
      for (const commentId of [run.contextCommentId, run.contextWakeCommentId]) {
        if (!commentId) continue;
        const existing = inputPlacementByCommentId.get(commentId);
        const queueIds = existing?.queueIds ?? new Set<string>();
        if (run.wakeupRequestId) queueIds.add(run.wakeupRequestId);
        if (Array.isArray(run.queuedCommentSourceWakeIds)) {
          for (const queueId of run.queuedCommentSourceWakeIds) queueIds.add(queueId);
        }
        if (existing) continue;
        inputPlacementByCommentId.set(commentId, {
          runId: run.id,
          anchorAt,
          sequence: 0,
          anchorMs: new Date(anchorAt).getTime(),
          kind: "run_start",
          queueIds,
        });
      }
    }
    // Same-turn steering has a durable PRP acknowledgement and a matching
    // activity fact keyed by commentId/targetRunId. Its acknowledgement time,
    // not the comment submission time, is the causal conversation slot. Use
    // only the first acknowledgement; an idempotent replay emits a diagnostic
    // activity row with duplicate=true but must not move the message later.
    const steeringEvents = resolvedActivity
      .filter((evt) => evt.action === "issue.queued_comment_steered")
      .sort(
        (a, b) =>
          new Date(a.createdAt).getTime() - new Date(b.createdAt).getTime(),
      );
    const steeringSequenceByRunId = new Map<string, number>();
    for (const evt of steeringEvents) {
      const details = evt.details ?? {};
      if (details["duplicate"] === true) continue;
      const commentId =
        typeof details["commentId"] === "string" ? details["commentId"] : null;
      const targetRunId =
        typeof details["targetRunId"] === "string"
          ? details["targetRunId"]
          : null;
      if (!commentId || !targetRunId) continue;
      const anchorAt =
        evt.createdAt instanceof Date
          ? evt.createdAt.toISOString()
          : evt.createdAt;
      const anchorMs = new Date(anchorAt).getTime();
      if (!Number.isFinite(anchorMs)) continue;
      const sequence = steeringSequenceByRunId.get(targetRunId) ?? 0;
      steeringSequenceByRunId.set(targetRunId, sequence + 1);
      inputPlacementByCommentId.set(commentId, {
        runId: targetRunId,
        anchorAt,
        sequence,
        anchorMs,
        kind: "steer",
        queueIds: inputPlacementByCommentId.get(commentId)?.queueIds ?? new Set(),
      });
    }
    for (const [commentId, placement] of localSteeringPlacements) {
      if (inputPlacementByCommentId.has(commentId)) continue;
      inputPlacementByCommentId.set(commentId, {
        runId: placement.targetRunId,
        anchorAt: placement.anchorAt,
        sequence: placement.sequence,
        anchorMs: new Date(placement.anchorAt).getTime(),
        kind: "steer",
        queueIds: new Set(),
      });
    }
    for (const evt of resolvedActivity) {
      if (evt.action !== "issue.comment_added" || !evt.runId) continue;
      const details = evt.details ?? {};
      const commentId =
        typeof details["commentId"] === "string" ? details["commentId"] : null;
      if (!commentId || runMetaByCommentId.has(commentId)) continue;
      const interruptedRunId =
        typeof details["interruptedRunId"] === "string"
          ? details["interruptedRunId"]
          : null;
      runMetaByCommentId.set(commentId, {
        runId: evt.runId,
        runAgentId: evt.agentId ?? agentIdByRunId.get(evt.runId) ?? null,
        interruptedRunId,
      });
    }
    for (const evt of resolvedActivity) {
      if (evt.action !== "issue.comment_added") continue;
      const details = evt.details ?? {};
      const commentId =
        typeof details["commentId"] === "string" ? details["commentId"] : null;
      if (!commentId) continue;
      if (
        details["followUpRequested"] === true ||
        details["resumeIntent"] === true
      ) {
        followUpCommentIds.add(commentId);
      }
    }

    // The queue can contain a saved message outside the loaded history page.
    // Keep its optimistic bubble until the canonical comment is available.
    const commentsToProject = [...comments];
    const loadedCommentIds = new Set(comments.map((comment) => comment.id));
    for (const placement of [
      ...localSteeringPlacements.values(),
      ...localInterruptPlacements.values(),
    ]) {
      if (placement.comment && !loadedCommentIds.has(placement.comment.id)) {
        commentsToProject.push(placement.comment);
        loadedCommentIds.add(placement.comment.id);
      }
    }
    const projectedComments = commentsToProject.map((comment) => {
      const activityMeta = runMetaByCommentId.get(comment.id);
      // Internal run finalization can persist a reply without a separate
      // comment_added activity row. Its durable authoring run is stronger
      // evidence than activity projection, and lets the transcript's chosen
      // completion comment own the answer after a refresh.
      const authoredRunId =
        comment.authorType === "agent" && comment.authorAgentId
          ? comment.createdByRunId
          : null;
      const meta = authoredRunId
        ? {
            runId: authoredRunId,
            runAgentId: comment.authorAgentId,
            interruptedRunId:
              activityMeta?.runId === authoredRunId
                ? activityMeta.interruptedRunId
                : null,
          }
        : activityMeta;
      const inputPlacement = inputPlacementByCommentId.get(comment.id);
      const submittedAtMs = new Date(comment.createdAt).getTime();
      // Older activity rows may predate the explicit followUpRequested flag.
      // A run-start input is a provable queued follow-up only when it was
      // submitted during a completed run for this issue and the same agent,
      // before the target run consumed it. Merely overlapping any linked run
      // is not enough: issue activity can link otherwise unrelated runs.
      const targetRun =
        inputPlacement?.kind === "run_start"
          ? resolvedLinkedRuns.find((run) => run.runId === inputPlacement.runId)
          : undefined;
      const targetStartedAtMs = targetRun
        ? new Date(targetRun.startedAt ?? targetRun.createdAt).getTime()
        : Number.NaN;
      const submittedDuringSourceRun = Boolean(
        targetRun?.contextIssueId === issueId &&
        Number.isFinite(targetStartedAtMs) &&
        Number.isFinite(submittedAtMs) &&
        resolvedLinkedRuns.some((run) => {
          if (
            run.runId === targetRun.runId ||
            run.agentId !== targetRun.agentId ||
            run.contextIssueId !== issueId ||
            !run.finishedAt
          ) {
            return false;
          }
          const startedAtMs = new Date(
            run.startedAt ?? run.createdAt,
          ).getTime();
          const finishedAtMs = new Date(run.finishedAt).getTime();
          return (
            Number.isFinite(startedAtMs) &&
            Number.isFinite(finishedAtMs) &&
            startedAtMs <= submittedAtMs &&
            submittedAtMs <= finishedAtMs &&
            finishedAtMs <= targetStartedAtMs
          );
        }),
      );
      const nextComment: IssueDetailComment = {
        ...comment,
        ...(meta ?? {}),
        ...(inputPlacement
          ? {
              consumedByRunId: inputPlacement.runId,
              consumedQueueIds: [...inputPlacement.queueIds],
              ...(inputPlacement.kind === "steer"
                ? { steeredIntoRunId: inputPlacement.runId }
                : {}),
              conversationAnchorAt: inputPlacement.anchorAt,
              conversationAnchorSequence: inputPlacement.sequence,
            }
          : {}),
      };
      if (followUpCommentIds.has(comment.id) || submittedDuringSourceRun) {
        nextComment.followUpRequested = true;
      }
      const queuedTargetRunId =
        locallyQueuedCommentRunIds.get(comment.id) ??
        nextComment.queueTargetRunId ??
        null;
      if (inputPlacement) {
        return {
          ...nextComment,
          clientStatus: undefined,
          queueState: undefined,
          queueTargetRunId: null,
          queueReason: undefined,
        };
      }
      const locallyQueuedComment = applyLocalQueuedIssueCommentState(
        nextComment,
        {
          queuedTargetRunId,
          targetRunIsLive: queuedTargetRunId
            ? liveRunIds.has(queuedTargetRunId)
            : false,
          runningRunId: interruptibleIssueRun?.id ?? null,
        },
      );
      if (locallyQueuedComment !== nextComment) {
        return locallyQueuedComment;
      }
      // A queued target is fixed when the message is submitted. If that run
      // settles while the request is still in flight, do not rebind the
      // message's Interrupt action to an unrelated run that became live later.
      if (queuedTargetRunId) {
        return nextComment;
      }
      if (
        isQueuedIssueComment({
          comment: nextComment,
          activeRunStartedAt,
          activeRunAgentId: interruptibleIssueRun?.agentId ?? null,
          activeRunCommentId: interruptibleIssueRun?.contextCommentId ?? null,
          activeRunWakeCommentId:
            interruptibleIssueRun?.contextWakeCommentId ?? null,
          runId: meta?.runId ?? nextComment.runId ?? null,
          interruptedRunId:
            meta?.interruptedRunId ?? nextComment.interruptedRunId ?? null,
        })
      ) {
        return {
          ...nextComment,
          queueState: "queued" as const,
          queueTargetRunId: interruptibleIssueRun?.id ?? null,
          queueReason: queuedCommentReason,
        };
      }
      return nextComment;
    });
    const questionDeliveryByInteractionId = new Map<
      string,
      { targetRunId: string; deliveryMode: string | null }
    >();
    for (const event of resolvedActivity) {
      if (event.action !== "issue.question_response_delivered") continue;
      const details = event.details ?? {};
      const interactionId =
        typeof details["interactionId"] === "string"
          ? details["interactionId"]
          : null;
      const targetRunId =
        typeof details["targetRunId"] === "string"
          ? details["targetRunId"]
          : null;
      if (
        !interactionId ||
        !targetRunId ||
        questionDeliveryByInteractionId.has(interactionId)
      ) {
        continue;
      }
      questionDeliveryByInteractionId.set(interactionId, {
        targetRunId,
        deliveryMode:
          typeof details["deliveryMode"] === "string"
            ? details["deliveryMode"]
            : null,
      });
    }
    const responseComments = classicTaskInterfaceEnabled
      ? []
      : interactions.flatMap((interaction): IssueDetailComment[] => {
          const answeredQuestions =
            interaction.kind === "ask_user_questions" &&
            interaction.status === "answered";
          const resolvedPlanDecision =
            isPlanConfirmationInteraction(interaction) &&
            (interaction.status === "accepted" ||
              interaction.status === "rejected");
          if (
            (!answeredQuestions && !resolvedPlanDecision) ||
            !interaction.resolvedAt
          ) {
            return [];
          }
          const resolvedAt =
            interaction.resolvedAt instanceof Date
              ? interaction.resolvedAt
              : new Date(interaction.resolvedAt);
          if (Number.isNaN(resolvedAt.getTime())) return [];
          const delivery = answeredQuestions
            ? (questionDeliveryByInteractionId.get(interaction.id) ?? null)
            : null;
          const queuedTargetRunId =
            interaction.sourceRunId &&
            interruptibleIssueRun?.id === interaction.sourceRunId &&
            interruptibleIssueRun.adapterType !== "paperclip_runner"
              ? interaction.sourceRunId
              : null;
          const body =
            interaction.kind === "ask_user_questions"
              ? buildAnsweredQuestionsDeliveryText(interaction)
              : isPlanConfirmationInteraction(interaction)
                ? buildPlanDecisionResponseText(interaction)
                : "";
          return [
            {
              id: `interaction-response:${interaction.id}`,
              companyId: interaction.companyId,
              issueId: interaction.issueId,
              authorType: interaction.resolvedByAgentId ? "agent" : "user",
              authorAgentId: interaction.resolvedByAgentId ?? null,
              authorUserId: interaction.resolvedByUserId ?? null,
              createdByRunId: interaction.resolvedByRunId ?? null,
              body,
              presentation: null,
              metadata: null,
              createdAt: resolvedAt,
              updatedAt: resolvedAt,
              consumedByRunId: delivery?.targetRunId ?? null,
              ...(delivery?.deliveryMode === "steered"
                ? { steeredIntoRunId: delivery.targetRunId }
                : {}),
              conversationAnchorAt: resolvedAt,
              conversationAnchorSequence: 0,
              ...(queuedTargetRunId
                ? {
                    queueState: "queued" as const,
                    queueTargetRunId: queuedTargetRunId,
                    queueReason: queuedCommentReason,
                  }
                : {}),
            },
          ];
        });
    return [...projectedComments, ...responseComments];
  }, [
    comments,
    classicTaskInterfaceEnabled,
    interactions,
    liveRunIds,
    localSteeringPlacements,
    localInterruptPlacements,
    locallyQueuedCommentRunIds,
    queuedCommentReason,
    resolvedActivity,
    resolvedLinkedRuns,
    resolvedActiveRun,
    resolvedLiveRuns,
    interruptibleIssueRun,
  ]);
  const startingCommentIds = useMemo(() =>
    startingQueuedCommentIds(authoritativeQueuedCommentQueue, resolvedLinkedRuns),
    [authoritativeQueuedCommentQueue, resolvedLinkedRuns]);
  const effectiveQueuedCommentQueue = useMemo(() => {
    if (!queuedCommentQueueEnabled) return null;
    const deliveredCommentRunIds = new Map<string, string>();
    const deliveredCommentQueueIds = new Map<string, string[]>();
    for (const comment of commentsWithRunMeta) {
      if (comment.consumedByRunId) {
        deliveredCommentRunIds.set(comment.id, comment.consumedByRunId);
        deliveredCommentQueueIds.set(comment.id, comment.consumedQueueIds ?? []);
      }
    }
    const visibleAuthoritativeQueue = authoritativeQueuedCommentQueue
      ? {
          ...authoritativeQueuedCommentQueue,
          entries: authoritativeQueuedCommentQueue.entries.filter(
            (entry) =>
              !consumedQueuedCommentIds.has(entry.comment.id) &&
              !discardedQueuedCommentIds.has(entry.comment.id) &&
              !deliveredCommentQueueIds.get(entry.comment.id)?.includes(
                authoritativeQueuedCommentQueue.queueId ?? "",
              ) &&
              deliveredCommentRunIds.get(entry.comment.id) !==
                authoritativeQueuedCommentQueue.targetRunId,
          ),
        }
      : null;
    const pendingComments = commentsWithRunMeta.flatMap((comment) => {
      if (
        consumedQueuedCommentIds.has(comment.id) ||
        deliveredCommentRunIds.has(comment.id) ||
        discardedQueuedCommentIds.has(comment.id) ||
        comment.steeredIntoRunId
      ) {
        return [];
      }
      const targetRunId =
        locallyQueuedCommentRunIds.get(comment.id) ??
        ("clientStatus" in comment && comment.clientStatus === "queued"
          ? (comment.queueTargetRunId ?? null)
          : comment.queueState === "queued"
            ? (comment.queueTargetRunId ?? null)
            : null);
      return targetRunId ? [{ comment, targetRunId }] : [];
    });
    const fallbackProtocol =
      liveRuntimeRun?.adapterType === "paperclip_runner" ||
      (!liveRuntimeRun && assigneeUsesPaperclipRunner)
        ? "paperclip_runner_v1"
        : "legacy";
    return mergePendingIssueQueuedComments({
      issueId,
      authoritativeQueue: visibleAuthoritativeQueue,
      pendingComments,
      fallbackProtocol,
    });
  }, [
    authoritativeQueuedCommentQueue,
    commentsWithRunMeta,
    consumedQueuedCommentIds,
    discardedQueuedCommentIds,
    issueId,
    liveRuntimeRun,
    assigneeUsesPaperclipRunner,
    locallyQueuedCommentRunIds,
    queuedCommentQueueEnabled,
  ]);
  const visibleQueuedCommentQueue = useMemo(() => {
    if (!effectiveQueuedCommentQueue) return null;
    const entries = effectiveQueuedCommentQueue.entries
      .filter(entry => !startingCommentIds.has(entry.comment.id))
      .map((entry, position) => ({ ...entry, position }));
    return entries.length ? { ...effectiveQueuedCommentQueue, entries } : null;
  }, [effectiveQueuedCommentQueue, startingCommentIds]);
  const commentsForThread = useMemo(
    () =>
      [...commentsWithRunMeta, ...(authoritativeQueuedCommentQueue?.entries ?? [])
        .filter(entry => startingCommentIds.has(entry.comment.id) &&
          !commentsWithRunMeta.some(comment => comment.id === entry.comment.id))
        .map((entry): IssueDetailComment => entry.comment)].flatMap((comment) => {
        if (discardedQueuedCommentIds.has(comment.id)) return [];
        if (!consumedQueuedCommentIds.has(comment.id) && !startingCommentIds.has(comment.id)) return [comment];
        return [
          {
            ...comment,
            ...(!comment.consumedByRunId && localInterruptPlacements.has(comment.id)
              ? {
                  conversationAnchorAt: localInterruptPlacements.get(comment.id)!.anchorAt,
                  conversationAnchorSequence: localInterruptPlacements.get(comment.id)!.sequence,
                }
              : {}),
            clientStatus: undefined,
            queueState: undefined,
            queueTargetRunId: null,
            queueReason: undefined,
          },
        ];
      }),
    [
      commentsWithRunMeta,
      consumedQueuedCommentIds,
      discardedQueuedCommentIds,
      localInterruptPlacements,
      authoritativeQueuedCommentQueue,
      startingCommentIds,
    ],
  );

  const storeQueuedCommentQueue = useCallback(
    (value: unknown) => {
      const queue = normalizeIssueQueuedCommentQueue(value, issueId);
      queryClient.setQueryData(queryKeys.issues.queuedComments(issueId), queue);
      return queue;
    },
    [issueId, queryClient],
  );

  const refreshQueueAfterConflict = useCallback(
    async (error: unknown) => {
      if (error instanceof ApiError && error.status === 409) {
        await queryClient.invalidateQueries({
          queryKey: queryKeys.issues.queuedComments(issueId),
        });
      }
      throw error;
    },
    [issueId, queryClient],
  );

  const editQueuedComment = useCallback(
    async (commentId: string, body: string, revision: string) => {
      const queueId = effectiveQueuedCommentQueue?.queueId;
      if (!queueId)
        throw new Error(
          "The queued message is awaiting server acknowledgement.",
        );
      try {
        storeQueuedCommentQueue(
          await issuesApi.editQueuedComment(issueId, commentId, {
            body,
            queueId,
            revision,
          }),
        );
        await queryClient.invalidateQueries({
          queryKey: queryKeys.issues.comments(issueId),
        });
      } catch (error) {
        await refreshQueueAfterConflict(error);
      }
    },
    [
      effectiveQueuedCommentQueue?.queueId,
      issueId,
      queryClient,
      refreshQueueAfterConflict,
      storeQueuedCommentQueue,
    ],
  );

  const reorderQueuedComments = useCallback(
    async (orderedCommentIds: string[], revision: string) => {
      const queueId = effectiveQueuedCommentQueue?.queueId;
      if (!queueId)
        throw new Error(
          "The queued messages are awaiting server acknowledgement.",
        );
      try {
        let nextPosition = 0;
        const fullOrder = effectiveQueuedCommentQueue.entries.map(entry =>
          startingCommentIds.has(entry.comment.id) ? entry.comment.id : orderedCommentIds[nextPosition++]!);
        storeQueuedCommentQueue(
          await issuesApi.reorderQueuedComments(issueId, {
            orderedCommentIds: fullOrder,
            queueId,
            revision,
          }),
        );
      } catch (error) {
        await refreshQueueAfterConflict(error);
      }
    },
    [
      effectiveQueuedCommentQueue,
      startingCommentIds,
      issueId,
      refreshQueueAfterConflict,
      storeQueuedCommentQueue,
    ],
  );

  const steerQueuedComment = useCallback(
    async (commentId: string, revision: string) => {
      const queueId = effectiveQueuedCommentQueue?.queueId;
      const targetRunId = effectiveQueuedCommentQueue?.targetRunId;
      if (!queueId || !targetRunId)
        throw new Error(
          "The queued message no longer has an active run target.",
        );
      const anchorAt = new Date().toISOString();
      setLocalSteeringPlacements((current) => {
        const next = new Map(current);
        const sequence = [...current.values()].filter(
          (placement) => placement.targetRunId === targetRunId,
        ).length;
        next.set(commentId, {
          targetRunId,
          anchorAt,
          sequence,
          comment: effectiveQueuedCommentQueue?.entries.find(
            (entry) => entry.comment.id === commentId,
          )?.comment,
        });
        return next;
      });
      setConsumedQueuedCommentIds((current) => new Set(current).add(commentId));
      try {
        const nextQueue = await issuesApi.steerQueuedComment(
          issueId,
          commentId,
          {
            queueId,
            targetRunId,
            revision,
          },
        );
        // The local placement bridges the durable receipt refresh. Release the
        // control as soon as delivery is acknowledged, even on a slow refetch.
        storeQueuedCommentQueue(nextQueue);
        void Promise.all([
          queryClient.invalidateQueries({
            queryKey: queryKeys.issues.comments(issueId),
          }),
          queryClient.invalidateQueries({
            queryKey: queryKeys.issues.activity(issueQueryRef),
          }),
        ]);
      } catch (error) {
        setConsumedQueuedCommentIds((current) => {
          const next = new Set(current);
          next.delete(commentId);
          return next;
        });
        setLocalSteeringPlacements((current) => {
          const next = new Map(current);
          next.delete(commentId);
          return next;
        });
        await refreshQueueAfterConflict(error);
      }
    },
    [
      effectiveQueuedCommentQueue,
      issueId,
      issueQueryRef,
      queryClient,
      refreshQueueAfterConflict,
      storeQueuedCommentQueue,
    ],
  );

  const interruptQueuedComments = useCallback(
    async (runId: string | null) => {
      const queuedComments = effectiveQueuedCommentQueue?.targetRunId === runId
        ? effectiveQueuedCommentQueue.entries.map((entry) => entry.comment)
        : commentsWithRunMeta.filter(
            (comment) => comment.queueState === "queued" && comment.queueTargetRunId === runId,
          );
      const ids = queuedComments.map((comment) => comment.id);
      const anchorAt = new Date().toISOString();
      setClassicQueuedDeliveryError(null);
      setConsumedQueuedCommentIds((current) => new Set([...current, ...ids]));
      setLocalInterruptPlacements((current) => {
        const next = new Map(current);
        queuedComments.forEach((comment, sequence) => {
          next.set(comment.id, { anchorAt, sequence, comment });
        });
        return next;
      });
      try {
        const updatedQueue = await onInterruptQueued(runId);
        if (updatedQueue?.state === "deferred") {
          const remaining = new Set(updatedQueue.entries.map(entry => entry.comment.id));
          setConsumedQueuedCommentIds(current => new Set([...current].filter(id => !remaining.has(id))));
          setLocalInterruptPlacements(current => new Map([...current].filter(([id]) => !remaining.has(id))));
          storeQueuedCommentQueue(updatedQueue);
          if (classicTaskInterfaceEnabled) setClassicQueuedDeliveryError(updatedQueue.executionWait?.message ?? "Messages are still queued.");
        }
        return updatedQueue;
      } catch (error) {
        setConsumedQueuedCommentIds((current) => {
          const next = new Set(current);
          for (const id of ids) next.delete(id);
          return next;
        });
        setLocalInterruptPlacements((current) => {
          const next = new Map(current);
          for (const id of ids) next.delete(id);
          return next;
        });
        if (classicTaskInterfaceEnabled) {
          setClassicQueuedDeliveryError("Couldn’t interrupt. Message is still queued.");
          return;
        }
        await refreshQueueAfterConflict(error);
        throw error;
      }
    },
    [
      effectiveQueuedCommentQueue,
      commentsWithRunMeta,
      onInterruptQueued,
      storeQueuedCommentQueue,
      refreshQueueAfterConflict,
      classicTaskInterfaceEnabled,
    ],
  );

  const discardQueuedComment = useCallback(
    async (commentId: string, revision: string) => {
      const queueId = effectiveQueuedCommentQueue?.queueId;
      if (!queueId)
        throw new Error(
          "The queued message is awaiting server acknowledgement.",
        );
      try {
        storeQueuedCommentQueue(
          await issuesApi.discardQueuedComment(issueId, commentId, {
            queueId,
            revision,
          }),
        );
        setDiscardedQueuedCommentIds((current) =>
          new Set(current).add(commentId),
        );
        // Discard deletes the persisted comment. Update both history caches
        // and task aliases so the row stays removed after this view unmounts.
        await onRemoveCommentFromCache(commentId);
        await queryClient.invalidateQueries({
          queryKey: queryKeys.issues.comments(issueId),
        });
      } catch (error) {
        const responseBody =
          error instanceof ApiError &&
          typeof error.body === "object" &&
          error.body !== null
            ? (error.body as { code?: unknown; details?: unknown })
            : null;
        const details =
          responseBody &&
          typeof responseBody.details === "object" &&
          responseBody.details !== null
            ? (responseBody.details as { code?: unknown })
            : null;
        const code =
          typeof details?.code === "string"
            ? details.code
            : typeof responseBody?.code === "string"
              ? responseBody.code
              : null;
        if (code === "queued_comment_already_dispatching") {
          pushToast({
            title: "Message is already being sent",
            body: "The continuation started before the discard was confirmed, so Paperclip could not unsend it.",
            tone: "error",
            ttlMs: 15_000,
            dedupeKey: `queued-comment-already-dispatching:${issueId}:${commentId}`,
          });
        }
        await refreshQueueAfterConflict(error);
      }
    },
    [
      effectiveQueuedCommentQueue?.queueId,
      issueId,
      onRemoveCommentFromCache,
      pushToast,
      queryClient,
      refreshQueueAfterConflict,
      storeQueuedCommentQueue,
    ],
  );

  const timelineEvents = useMemo(
    () => extractIssueTimelineEvents(resolvedActivity),
    [resolvedActivity],
  );
  const workModeChanges = useMemo(
    () => extractIssueWorkModeChanges(resolvedActivity),
    [resolvedActivity],
  );

  const scrollingHistory = conversationMode ? {
    hasMore: !!hasOlderComments,
    loading: commentsLoadingOlder,
    error: commentsOlderError,
    load: onLoadOlderComments,
  } : undefined;
  const loadOlderButton = !conversationMode && hasOlderComments ? (
    <div className="flex justify-center">
      <Button
        type="button"
        variant="outline"
        size="sm"
        disabled={commentsLoadingOlder}
        onClick={onLoadOlderComments}
      >
        {commentsLoadingOlder
          ? "Loading earlier comments..."
          : "Load earlier comments"}
      </Button>
    </div>
  ) : null;

  const savedThread = (
    <div
      className={
        classicTaskInterfaceEnabled
          ? "space-y-3"
          : "flex min-h-0 flex-1 flex-col"
      }
    >
      {/* Chat-style: the button rides inside the thread's scroll viewport with
          the header so nothing sits above the thread in the page flow. */}
      {classicTaskInterfaceEnabled ? loadOlderButton : null}
      {classicTaskInterfaceEnabled &&
      commentsInitialLoading &&
      commentsWithRunMeta.length === 0 &&
      interactions.length === 0 ? (
        <IssueChatSkeleton />
      ) : (
        <TaskChatScrollNavigation.Provider
          value={{
            ...taskChatScrollEntry(scrollLocation),
            restore: scrollNavigationType === "POP",
          }}
        >
          <EmailThreadProvider companyId={companyId} issueId={issueId}>
          <ThreadComponent
            {...(!classicTaskInterfaceEnabled ? {
              compactHistory: !historyExpanded,
              onExpandHistory: conversationMode ? undefined : onExpandHistory,
              scrollingHistory,
              historyControl: conversationMode ? null : !historyExpanded && (hasEarlierMessages || hasEarlierRuns) ? (
                <Button type="button" variant="ghost" size="sm" onClick={onExpandHistory}>
                  More messages
                </Button>
              ) : null,
            } : {})}
            executionBlocked={executionBlocked}
            interruption={interruption}
            retryPreparing={retryPreparing}
            key={conversationMode ? draftKey : issueId}
            {...(!classicTaskInterfaceEnabled ? { creationActivity: resolvedActivity } : {})}
            onOpenSkill={onOpenSkill}
            browsers={browsers}
            onOpenBrowser={onOpenBrowser}
            hasOlderComments={hasOlderComments}
            initialHistoryPending={!!issueId && (
              initialHistoryPending ||
              commentsInitialLoading ||
              // These responses add rows or change the composer takeover.
              // Coordinate the first reveal so each response does not move a
              // conversation the reader has already started looking at.
              initialMetadataPending ||
              activityPending ||
              linkedRunsPending ||
              (conversationMode && observedRunIds.length > 0 && commentRuns.isPending) ||
              inputFacts.isLoading ||
              !runtimeSelectionKnown)
            }
            initialHistoryError={
              initialHistoryError ||
              activityError ||
              (!historyExpanded && inputFacts.isError) ||
              linkedRunsError ||
              (conversationMode && commentRuns.isError) ||
              liveRunsError ||
              (activeRunQueryEnabled && activeRunError)
            }
            onRetryInitialHistory={() => {
              onRetryInitialHistory?.();
              void refetchActivity();
              if (!historyExpanded && inputCommentIds.length) void inputFacts.refetch();
              void refetchLinkedRuns();
              if (conversationMode && observedRunIds.length) void commentRuns.refetch();
              void refetchLiveRuns();
              if (activeRunQueryEnabled) void refetchActiveRun();
            }}
            composerRef={composerRef}
            composerAccessory={<><WorkspaceRetryControl />{composerAccessory}</>}
            threadHeader={
              !classicTaskInterfaceEnabled &&
              (threadHeader || loadOlderButton) ? (
                <>
                  {threadHeader}
                  {loadOlderButton}
                </>
              ) : null
            }
            issueBrief={issueBrief}
            comments={commentsForThread}
            interactions={interactions}
            documents={documents}
            workProducts={workProducts}
            attachments={attachments}
            feedbackVotes={feedbackVotes}
            feedbackDataSharingPreference={feedbackDataSharingPreference}
            feedbackTermsUrl={feedbackTermsUrl}
            linkedRuns={timelineRuns}
            onRetryFailedRun={(runId) =>
              retryFailedRun.mutateAsync(runId).then(() => undefined)
            }
            retryFailedRunId={
              retryFailedRun.isPending ? retryFailedRun.variables : null
            }
            timelineEvents={timelineEvents}
            workModeChanges={workModeChanges}
            liveRuns={resolvedLiveRuns}
            activeRun={resolvedActiveRun}
            issueId={issueId}
            blockedBy={blockedBy ?? []}
            liveIssueIds={liveIssueIds}
            blockerAttention={blockerAttention}
            successfulRunHandoff={successfulRunHandoff}
            scheduledRetry={scheduledRetry}
            recoveryAction={recoveryAction?.cause === "native_workspace_finalization_owner_unverified" ? null : recoveryAction ?? null}
            onResolveRecoveryAction={onResolveRecoveryAction}
            onReissueIsolatedRecoveryAction={onReissueIsolatedRecoveryAction}
            reissueIsolatedRecoveryActionPending={
              reissueIsolatedRecoveryActionPending
            }
            onReconcileForwardRecoveryAction={onReconcileForwardRecoveryAction}
            onBreakGlassOverrideRecoveryAction={
              onBreakGlassOverrideRecoveryAction
            }
            onQuarantineRestoreRecoveryAction={
              onQuarantineRestoreRecoveryAction
            }
            quarantineRestoreRecoveryActionPending={
              quarantineRestoreRecoveryActionPending
            }
            canBreakGlassRecoveryAction={canBreakGlassRecoveryAction}
            reconcileRecoveryActionPending={reconcileRecoveryActionPending}
            canFalsePositiveRecoveryAction={canFalsePositiveRecoveryAction}
            legacyRecoverySourceIssue={legacyRecoverySourceIssue ?? null}
            companyId={companyId}
            projectId={projectId}
            issueStatus={issueStatus}
            issueAssigneeAgentId={issueAssigneeAgentId}
            agentMap={agentMap}
            currentUserId={currentUserId}
            userLabelMap={userLabelMap}
            userProfileMap={userProfileMap}
            draftKey={draftKey}
            conversationMode={conversationMode}
            enableReassign={!conversationMode}
            reassignOptions={reassignOptions}
            currentAssigneeValue={currentAssigneeValue}
            assigneeAdapterOverrides={assigneeAdapterOverrides}
            suggestedAssigneeValue={suggestedAssigneeValue}
            mentions={mentions}
            composerPause={composerPause}
            composerDisabledReason={composerDisabledReason}
            composerHint={composerHint}
            onVote={onVote}
            onAdd={onAdd}
            imageUploadHandler={onImageUpload}
            onAttachImage={onAttachImage}
            onInterruptQueued={interruptQueuedComments}
            queuedCommentQueue={visibleQueuedCommentQueue}
            onEditQueuedComment={editQueuedComment}
            onReorderQueuedComments={reorderQueuedComments}
            onSteerQueuedComment={steerQueuedComment}
            onDiscardQueuedComment={discardQueuedComment}
            onDeleteComment={onDeleteComment}
            onCancelQueued={onCancelQueued}
            interruptingQueuedRunId={interruptingQueuedRunId}
            stoppingRunId={
              stopGrokWork.isPending ? stopGrokWork.variables.id : pauseWorkPending
                ? (pausingWorkRunId ?? interruptibleIssueRun?.id ?? null)
                : pausingWorkRunId
            }
            onStopRun={
              grokWork || onPauseWorkRun
                ? async (runId) => {
                    const selectedRun = resolvedLiveRuns.find(run => run.id === runId)
                      ?? (resolvedActiveRun?.id === runId ? resolvedActiveRun : null);
                    const selectedAgent = selectedRun ? agentMap.get(selectedRun.agentId) : null;
                    if (selectedRun && selectedAgent?.adapterType === "paperclip_runner" && selectedAgent.adapterConfig.provider === "grok_bot") {
                      await stopGrokWork.mutateAsync(selectedRun).catch(() => undefined);
                    } else if (onPauseWorkRun) {
                      await onPauseWorkRun(runId).catch(() => undefined);
                    }
                  }
                : undefined
            }
            stopRunLabel={grokWork ? "Stop Paperclip work" : "Pause work"}
            stoppingRunLabel={grokWork ? "Stopping Paperclip work…" : "Pausing..."}
            stopRunVariant={grokWork ? "stop" : "pause"}
            runFinalizationActions={runFinalizationActions}
            onAcceptInteraction={onAcceptInteraction}
            onRejectInteraction={onRejectInteraction}
            onSubmitInteractionAnswers={(interaction, answers) =>
              onSubmitInteractionAnswers(interaction, answers)
            }
            onCancelInteraction={onCancelInteraction}
            onSkipInteraction={onSkipInteraction}
            onDismissInteraction={onDismissInteraction}
            onSubmitInteractionVerdicts={onSubmitInteractionVerdicts}
            issueWorkMode={issueWorkMode}
            onWorkModeChange={onWorkModeChange}
            stopPending={grokWork ? stopGrokWork.isPending : stopResponsePending}
            onCancelRun={
              grokWork && interruptibleIssueRun ? () => stopGrokWork.mutateAsync(interruptibleIssueRun).then(() => undefined) : interruptibleIssueRun && onStopResponse
                ? () => onStopResponse(interruptibleIssueRun.id)
                : undefined
            }
            onImageClick={onImageClick}
            onRefreshLatestComments={onRefreshLatestComments}
            assigneeUserId={assigneeUserId}
            onResumeFromBacklog={onResumeFromBacklog}
            resumeFromBacklogPending={resumeFromBacklogPending}
            onResumeAssignee={onResumeAssignee}
            resumeAssigneePending={resumeAssigneePending}
            onTryAgainNoLiveExecutionPath={onTryAgainNoLiveExecutionPath}
            tryAgainNoLiveExecutionPathPending={
              tryAgainNoLiveExecutionPathPending
            }
            footer={grokWork || stopGrokWork.error || classicQueuedDeliveryError ? <>
              {grokWork && <p className="text-xs text-muted-foreground">Runs in Grok Bot · Usage not reported. Stop Paperclip work revokes this session’s authority; remote execution may continue. Open the Grok Bot desktop app to inspect it.</p>}
              {stopGrokWork.error && <p role="alert" className="text-sm text-destructive">{describeError(stopGrokWork.error).body}</p>}
              {classicQueuedDeliveryError && <p role="status" className="text-sm text-destructive">{classicQueuedDeliveryError}</p>}
              {footer}
            </> : footer}
            externalReferences={externalReferences}
            linkCaseReferences={linkCaseReferences}
          />
          </EmailThreadProvider>
        </TaskChatScrollNavigation.Provider>
      )}
    </div>
  );

  return import.meta.env.DEV && designSandbox && !classicTaskInterfaceEnabled && !conversationMode ? (
    <Suspense fallback={savedThread}>
      <DesignSandboxTaskThread
        previewMode="playback"
        key={issueId}
        header={threadHeader}
        agentName={agentMap.get(issueAssigneeAgentId ?? "")?.name ?? "Preview agent"}
        agent={agentMap.get(issueAssigneeAgentId ?? "")}
        defaultConversation={issueQueryRef === "DES-1" || issueQueryRef === "DES-7"}
      >
        {savedThread}
      </DesignSandboxTaskThread>
    </Suspense>
  ) : savedThread;
});

type IssueDetailActivityTabProps = {
  issue: Issue;
  issueId: string;
  companyId: string;
  issueStatus: Issue["status"];
  childIssues: Issue[];
  agentMap: Map<string, Agent>;
  hasLiveRuns: boolean;
  currentUserId: string | null;
  userProfileMap: Map<
    string,
    import("../lib/company-members").CompanyUserProfile
  >;
  pendingApprovalAction: {
    approvalId: string;
    action: "approve" | "reject";
  } | null;
  onApprovalAction: (approvalId: string, action: "approve" | "reject") => void;
  handoffFocusSignal?: number;
  externalReferences?: MarkdownExternalReferenceMap;
};

function IssueDetailActivityTab({
  issue,
  issueId,
  companyId,
  issueStatus,
  childIssues,
  agentMap,
  hasLiveRuns,
  currentUserId,
  userProfileMap,
  pendingApprovalAction,
  onApprovalAction,
  handoffFocusSignal = 0,
  externalReferences,
}: IssueDetailActivityTabProps) {
  const { data: activity, isLoading: activityLoading } = useQuery({
    queryKey: queryKeys.issues.activity(issueId),
    queryFn: () => activityApi.forIssue(issueId),
    placeholderData: keepPreviousDataForSameQueryTail<ActivityEvent[]>(issueId),
  });
  const { data: linkedRuns, isLoading: linkedRunsLoading } = useQuery({
    queryKey: queryKeys.issues.runs(issueId),
    queryFn: () => activityApi.runsForIssue(issueId),
    placeholderData: keepPreviousDataForSameQueryTail<RunForIssue[]>(issueId),
  });
  const { data: linkedApprovals } = useQuery({
    queryKey: queryKeys.issues.approvals(issueId),
    queryFn: () => issuesApi.listApprovals(issueId),
    placeholderData:
      keepPreviousDataForSameQueryTail<
        Awaited<ReturnType<typeof issuesApi.listApprovals>>
      >(issueId),
  });
  const { data: continuationHandoff } = useQuery({
    queryKey: queryKeys.issues.document(
      issueId,
      ISSUE_CONTINUATION_SUMMARY_DOCUMENT_KEY,
    ),
    queryFn: async () => {
      try {
        return await issuesApi.getDocument(
          issueId,
          ISSUE_CONTINUATION_SUMMARY_DOCUMENT_KEY,
        );
      } catch (error) {
        if (error instanceof ApiError && error.status === 404) return null;
        throw error;
      }
    },
    placeholderData: keepPreviousDataForSameQueryTail<Awaited<
      ReturnType<typeof issuesApi.getDocument>
    > | null>(issueId),
  });
  const { data: issueTreeCostSummary } = useQuery({
    queryKey: queryKeys.issues.costSummary(issueId),
    queryFn: () => issuesApi.getCostSummary(issueId),
    placeholderData:
      keepPreviousDataForSameQueryTail<
        Awaited<ReturnType<typeof issuesApi.getCostSummary>>
      >(issueId),
  });
  const initialLoading =
    (activityLoading && activity === undefined) ||
    (linkedRunsLoading && linkedRuns === undefined);
  const issueCostSummary = useMemo(() => {
    let input = 0;
    let output = 0;
    let cached = 0;
    let totalTokens = 0;
    let cost = 0;
    let runtimeMs = 0;
    let runCount = 0;
    let hasCost = false;
    let hasTokens = false;
    const nowMs = Date.now();

    for (const run of linkedRuns ?? []) {
      const usage = asRecord(run.usageJson);
      const result = asRecord(run.resultJson);
      const runInput = usageNumber(usage, "inputTokens", "input_tokens");
      const runOutput = usageNumber(usage, "outputTokens", "output_tokens");
      const runCached = usageNumber(
        usage,
        "cachedInputTokens",
        "cached_input_tokens",
        "cache_read_input_tokens",
      );
      const runCost = visibleRunCostUsd(usage, result);
      if (runCost > 0) hasCost = true;
      if (runInput + runOutput + runCached > 0) hasTokens = true;
      input += runInput;
      output += runOutput;
      cached += runCached;
      totalTokens += visibleRunTokenTotal(usage);
      cost += runCost;

      if (run.startedAt) {
        const startMs = new Date(run.startedAt).getTime();
        const endMs = run.finishedAt
          ? new Date(run.finishedAt).getTime()
          : nowMs;
        if (
          Number.isFinite(startMs) &&
          Number.isFinite(endMs) &&
          endMs >= startMs
        ) {
          runtimeMs += endMs - startMs;
          runCount += 1;
        }
      }
    }

    return {
      input,
      output,
      cached,
      cost,
      totalTokens,
      hasCost,
      hasTokens,
      runtimeMs,
      runCount,
      hasRuntime: runtimeMs > 0,
    };
  }, [linkedRuns]);
  const issueTreeCostTokens =
    (issueTreeCostSummary?.inputTokens ?? 0) +
    (issueTreeCostSummary?.cachedInputTokens ?? 0) +
    (issueTreeCostSummary?.outputTokens ?? 0);
  const hasIssueTreeCost =
    !!issueTreeCostSummary &&
    (issueTreeCostSummary.costCents > 0 ||
      issueTreeCostTokens > 0 ||
      issueTreeCostSummary.cachedInputTokens > 0 ||
      issueTreeCostSummary.runtimeMs > 0 ||
      issueTreeCostSummary.issueCount > 1);
  const shouldShowCostSummary =
    (linkedRuns && linkedRuns.length > 0) || hasIssueTreeCost;

  if (initialLoading) {
    return <IssueSectionSkeleton titleWidth="w-20" rows={4} />;
  }

  return (
    <>
      {shouldShowCostSummary && (
        <div className="mb-3 px-3 py-2 rounded-lg border border-border">
          <div className="text-sm font-medium text-muted-foreground mb-1">
            Cost Summary
          </div>
          {!issueCostSummary.hasCost &&
          !issueCostSummary.hasTokens &&
          !hasIssueTreeCost ? (
            <div className="text-xs text-muted-foreground">
              No cost data yet.
            </div>
          ) : (
            <div className="space-y-1 text-xs text-muted-foreground tabular-nums">
              <div className="flex flex-wrap gap-3">
                <span className="font-medium text-foreground">This task</span>
                {issueCostSummary.hasCost ? (
                  <span className="font-medium text-foreground">
                    ${issueCostSummary.cost.toFixed(4)}
                  </span>
                ) : null}
                {issueCostSummary.hasTokens ? (
                  <span>
                    Tokens {formatTokens(issueCostSummary.totalTokens)}
                    {issueCostSummary.cached > 0
                      ? ` (in ${formatTokens(issueCostSummary.input)}, out ${formatTokens(issueCostSummary.output)}, cached ${formatTokens(issueCostSummary.cached)})`
                      : ` (in ${formatTokens(issueCostSummary.input)}, out ${formatTokens(issueCostSummary.output)})`}
                  </span>
                ) : null}
                {issueCostSummary.hasRuntime ? (
                  <span>
                    Runtime {formatDurationMs(issueCostSummary.runtimeMs)}
                    {` (${issueCostSummary.runCount} run${issueCostSummary.runCount === 1 ? "" : "s"})`}
                  </span>
                ) : null}
                {!issueCostSummary.hasCost &&
                !issueCostSummary.hasTokens &&
                !issueCostSummary.hasRuntime ? (
                  <span>No direct cost data.</span>
                ) : null}
              </div>
              {hasIssueTreeCost && issueTreeCostSummary ? (
                <div className="flex flex-wrap gap-3">
                  <span className="font-medium text-foreground">
                    Including sub-tasks{" "}
                    {(issueTreeCostSummary.costCents / 100).toLocaleString(
                      undefined,
                      {
                        style: "currency",
                        currency: "USD",
                        minimumFractionDigits: 4,
                        maximumFractionDigits: 4,
                      },
                    )}
                  </span>
                  <span>
                    Tokens {formatTokens(issueTreeCostTokens)}
                    {issueTreeCostSummary.cachedInputTokens > 0
                      ? ` (in ${formatTokens(issueTreeCostSummary.inputTokens)}, out ${formatTokens(issueTreeCostSummary.outputTokens)}, cached ${formatTokens(issueTreeCostSummary.cachedInputTokens)})`
                      : ` (in ${formatTokens(issueTreeCostSummary.inputTokens)}, out ${formatTokens(issueTreeCostSummary.outputTokens)})`}
                  </span>
                  {issueTreeCostSummary.runCount > 0 ? (
                    <span>
                      Runtime {formatDurationMs(issueTreeCostSummary.runtimeMs)}
                      {` (${issueTreeCostSummary.runCount} run${issueTreeCostSummary.runCount === 1 ? "" : "s"})`}
                    </span>
                  ) : null}
                  <span>
                    {issueTreeCostSummary.issueCount} task
                    {issueTreeCostSummary.issueCount === 1 ? "" : "s"}
                  </span>
                </div>
              ) : null}
            </div>
          )}
        </div>
      )}
      <div className="mb-3">
        <IssueRunLedger
          issueId={issueId}
          companyId={companyId}
          issueStatus={issueStatus}
          childIssues={childIssues}
          agentMap={agentMap}
          hasLiveRuns={hasLiveRuns}
          activityEvents={activity ?? []}
          resolveUserLabel={(userId) =>
            userProfileMap.get(userId)?.label ?? null
          }
          renderActivityEvent={(evt) => {
            const tone = successfulRunHandoffActivityTone(evt.action);
            const isHandoffWarning =
              evt.action === SUCCESSFUL_RUN_HANDOFF_REQUIRED_ACTION ||
              evt.action === SUCCESSFUL_RUN_HANDOFF_ESCALATED_ACTION;
            return (
              <div
                className={cn(
                  "space-y-1.5 rounded-lg border px-3 py-2 text-xs",
                  tone.className,
                )}
              >
                <div className="flex items-center gap-1.5">
                  {isHandoffWarning ? (
                    <AlertTriangle
                      className={cn("h-3.5 w-3.5 shrink-0", tone.iconClassName)}
                    />
                  ) : null}
                  <ActorIdentity
                    evt={evt}
                    agentMap={agentMap}
                    userProfileMap={userProfileMap}
                  />
                  <span>
                    {formatIssueActivityAction(evt.action, evt.details, {
                      agentMap,
                      userProfileMap,
                      currentUserId,
                    })}
                  </span>
                  <span className="ml-auto shrink-0">
                    {relativeTime(evt.createdAt)}
                  </span>
                </div>
                <IssueReferenceActivitySummary event={evt} />
                {/* Field-level who/what/why receipt for agent and board edits alike. */}
                <IssueFieldChangeReceipt
                  event={evt}
                  resolveAgentLabel={(agentId) =>
                    agentMap.get(agentId)?.name ?? null
                  }
                  resolveUserLabel={(userId) =>
                    userProfileMap.get(userId)?.label ?? null
                  }
                />
                {/* A refused write explains itself here, not just in the API error. */}
                {(() => {
                  const denial = issueWriteDenialForActivity(
                    evt.action,
                    evt.details,
                    {
                      actorLabel: evt.agentId
                        ? (agentMap.get(evt.agentId)?.name ?? null)
                        : null,
                      responsibleUserName: evt.responsibleUserId
                        ? (userProfileMap.get(evt.responsibleUserId)?.label ??
                          null)
                        : null,
                    },
                  );
                  return denial ? (
                    <IssueWriteDenialNotice
                      code={denial.code}
                      context={denial.context}
                    />
                  ) : null;
                })()}
              </div>
            );
          }}
        />
      </div>
      <IssueContinuationHandoff
        document={continuationHandoff}
        focusSignal={handoffFocusSignal}
        externalReferences={externalReferences}
      />
      {linkedApprovals && linkedApprovals.length > 0 && (
        <div className="mb-3 space-y-3">
          {linkedApprovals.map((approval) => (
            <ApprovalCard
              key={approval.id}
              approval={approval}
              requesterAgent={
                approval.requestedByAgentId
                  ? (agentMap.get(approval.requestedByAgentId) ?? null)
                  : null
              }
              onApprove={() => onApprovalAction(approval.id, "approve")}
              onReject={() => onApprovalAction(approval.id, "reject")}
              detailLink={`/approvals/${approval.id}`}
              isPending={pendingApprovalAction?.approvalId === approval.id}
              pendingAction={
                pendingApprovalAction?.approvalId === approval.id
                  ? pendingApprovalAction.action
                  : null
              }
            />
          ))}
        </div>
      )}
      <IssueScheduledRetryCard
        issueId={issue.id}
        scheduledRetry={issue.scheduledRetry ?? null}
      />
      {/* Waiting-monitor state now lives in the pinned top banner (IssueMonitorBanner) — PAP-14557 decision 1. */}
    </>
  );
}

export function IssueDetail({ tasksTab }: { tasksTab?: TaskSidePanelProps["tasksTab"] }) { return <TaskDetailSurface tasksTab={tasksTab} />; }

/** One controller and surface for both task URLs and agent conversations. */
export function TaskDetailSurface({ conversation, tasksTab }: { tasksTab?: TaskSidePanelProps["tasksTab"]; conversation?: {
  agent: Agent; issue: Issue | null; ensureIssue: () => Promise<Issue>;
} }) {
  const { issueId: routeIssueId, companyPrefix } = useParams<{ issueId: string; companyPrefix: string }>();
  const issueId = conversation ? conversation.issue?.id : routeIssueId;
  const [draftWorkMode, setDraftWorkMode] = useState<IssueWorkMode>("standard");
  const draftIssue = useMemo(() => conversation ? agentChatDraft(conversation.agent, draftWorkMode) : undefined, [conversation?.agent, draftWorkMode]);
  const pendingDraftWorkMode = useRef<IssueWorkMode | null>(null);
  const { companies, selectedCompanyId } = useCompany();
  // Classic Task Interface remains the sole task-chat-vs-pre-chat switch from
  // master. Streamlined UI only layers the new task-detail presentation onto
  // master's default task-chat shell.
  const {
    classicTaskInterfaceEnabled,
    taskChatShellEnabled,
    streamlinedTaskDetailEnabled,
    streamlinedUiEnabled,
    loaded: taskInterfaceSettingsLoaded,
    coordinatorWorkspaceEnabled,
  } = useTaskDetailInterfaceMode(!!conversation);
  const designSandbox = useDesignSandbox();
  const proposedTaskHeader = (designSandbox || coordinatorWorkspaceEnabled) && streamlinedTaskDetailEnabled;
  // Chat-style: the page wrapper spans the full center pane so the thread's
  // scroll viewport (and its scrollbar) reaches the properties-pane border;
  // every non-thread section re-centers itself at the 60rem shell cap instead.
  const shellSectionClass = taskChatShellEnabled
    ? "mx-auto w-full max-w-(--tc-shell-max-w)"
    : undefined;
  const { openNewIssue } = useDialogActions();
  const {
    openPanel,
    closePanel,
    panelVisible,
    setPanelVisible,
    requestPanelMaximize,
    clearPanelMaximizeRequest,
  } = usePanel();
  const {
    setBreadcrumbs,
    setBreadcrumbToolbar,
    setBreadcrumbPanelControl,
    setMobileToolbar,
  } = useBreadcrumbs();
  const queryClient = useQueryClient();
  const navigate = useNavigate();
  const navigationType = useNavigationType();
  const location = useLocation();
  const { pushToast } = useToastActions();
  const { isMobile } = useSidebar();
  const [moreOpen, setMoreOpen] = useState(false);
  const [copied, setCopied] = useState(false);
  const [mobilePropsOpen, setMobilePropsOpen] = useState(false);
  const [artifactsOpenRequest, setArtifactsOpenRequest] = useState<{
    issueId: string;
    requestId: number;
    handled?: boolean;
  } | null>(null);
  const [openAttachment, setOpenAttachment] = useState<{ issueId: string; id: string; title: string; requestId: number } | null>(null);
  const [openSkill, setOpenSkill] = useState<{ id: string; name: string } | null>(null);
  const handleSkillOpened = useCallback((skillId: string) => {
    setOpenSkill((current) => current?.id === skillId ? null : current);
  }, []);
  const [documentDeepLink, setDocumentDeepLink] = useState<
    (IssuePropertiesDocumentDeepLink & { issueId: string }) | null
  >(null);
  const [fileViewerPromptOpen, setFileViewerPromptOpen] = useState(false);
  const [detailTab, setDetailTab] = useState("chat");
  // Redesign: the center tab strip is hidden, so chat is the only surface —
  // deep links that would switch tabs (e.g. #document- hashes) stay on chat.
  const resolvedDetailTab = taskChatShellEnabled ? "chat" : detailTab;
  const [handoffFocusSignal, setHandoffFocusSignal] = useState(0);
  const [pendingApprovalAction, setPendingApprovalAction] = useState<{
    approvalId: string;
    action: "approve" | "reject";
  } | null>(null);
  const [attachmentError, setAttachmentError] = useState<string | null>(null);
  const [attachmentDragActive, setAttachmentDragActive] = useState(false);
  const [galleryOpen, setGalleryOpen] = useState(false);
  const [galleryIndex, setGalleryIndex] = useState(0);
  const [treeControlOpen, setTreeControlOpen] = useState(false);
  const [treeControlWakeWarning, setTreeControlWakeWarning] = useState<
    string | null
  >(null);
  const [treeControlMode, setTreeControlMode] =
    useState<Exclude<IssueTreeControlMode, "pause">>("resume");
  const [treeControlWakeAgentsOnResume, setTreeControlWakeAgentsOnResume] =
    useState(false);
  const [optimisticComments, setOptimisticComments] = useState<
    OptimisticIssueComment[]
  >([]);
  const [locallyQueuedCommentRunIds, setLocallyQueuedCommentRunIds] = useState<
    Map<string, string>
  >(() => new Map());
  const [pendingCommentComposerFocusKey, setPendingCommentComposerFocusKey] =
    useState(0);
  const fileInputRef = useRef<HTMLInputElement | null>(null);
  const lastMarkedReadIssueIdRef = useRef<string | null>(null);
  const lastScrollIssueIdRef = useRef<string | undefined>(undefined);
  const commentComposerRef = useRef<IssueChatComposerHandle | null>(null);
  const cancelledQueuedOptimisticCommentIdsRef = useRef(new Set<string>());
  const commentRenderKeys = useRef(new Map<string, string>());
  const resolvedIssueDetailState = useMemo(
    () =>
      readIssueDetailLocationState(issueId, location.state, location.search),
    [issueId, location.state, location.search],
  );
  const relationIssueLinkState = useMemo(() => {
    const sourceState = resolvedIssueDetailState ?? location.state;
    if (!streamlinedTaskDetailEnabled) return sourceState;
    if (typeof sourceState !== "object" || sourceState === null)
      return sourceState;
    return {
      ...sourceState,
      // The inbox `y` shortcut is intentionally armed only for the selected
      // inbox row. Preserve the origin/breadcrumb when opening a related task,
      // but do not let that one-row archive affordance leak to the relation.
      issueDetailInboxQuickArchiveArmed: false,
    };
  }, [location.state, resolvedIssueDetailState, streamlinedTaskDetailEnabled]);
  const preferInboxHistoryBack = useMemo(
    () =>
      readIssueDetailLocationState(null, location.state)?.issueDetailSource ===
      "inbox",
    [location.state],
  );
  const issueHeaderSeed = useMemo(
    () =>
      readIssueDetailHeaderSeed(location.state) ??
      readIssueDetailHeaderSeed(resolvedIssueDetailState),
    [location.state, resolvedIssueDetailState],
  );

  const coreIssueQuery = useQuery({
    queryKey: [...queryKeys.issues.detail(issueId!), "core"],
    queryFn: async ({ signal }) => {
      const core = await issuesApi.getCore(issueId!, { signal });
      seedIssueDetailProjections(queryClient, core, issueId);
      return core;
    },
    enabled: !!issueId,
  });
  const { historyExpanded, expandHistory, recent: recentComments, retainComment, acknowledgedComments } = useIssueHistoryWindow(
    issueId,
    // Classic settings can resolve before the personal workspace preference.
    // Do not persist full-history expansion for a surface we have not chosen.
    Boolean(!conversation && !coreIssueQuery.data?.conversationAgentId && taskInterfaceSettingsLoaded && classicTaskInterfaceEnabled),
    coreIssueQuery.data,
    Boolean(conversation || coreIssueQuery.data?.conversationAgentId),
  );
  const paginatedConversation = Boolean(conversation || coreIssueQuery.data?.conversationAgentId);
  const issueQuery = useQuery({
    ...getIssueDetailQueryOptions(queryClient, issueId!, {
      placeholderIssue: issueHeaderSeed
        ? {
            id: issueHeaderSeed.id,
            identifier: issueHeaderSeed.identifier,
          }
        : null,
    }),
    enabled: !!issueId && (coreIssueQuery.isFetched || !!queryClient.getQueryData(queryKeys.issues.detail(issueId))),
  });
  const {
    data: queriedIssue,
    isLoading,
    isPlaceholderData,
    error,
    refetch: refetchIssueDetail,
  } = issueQuery;
  // A header seed is a placeholder, not loaded data: it must not count as
  // content worth keeping on screen through a failure.
  const issueView = useQueryView(isPlaceholderData ? { ...issueQuery, data: undefined } : issueQuery);
  const coreIssueView = useQueryView(coreIssueQuery);
  useEffect(() => {
    if (issueId && historyExpanded) void prefetchIssueThread(queryClient, issueId);
  }, [issueId, historyExpanded, queryClient]);
  const accessError = [error, coreIssueQuery.error].find((value) =>
    value instanceof ApiError && [401, 403, 404].includes(value.status),
  );
  const issue = accessError ? undefined : queriedIssue ?? coreIssueQuery.data ?? conversation?.issue ?? draftIssue;
  const taskRetry = useTaskRetry(issue ?? undefined);
  const resolveWritableIssueId = async () => {
    if (!conversation) return issueId!;
    const resolved = await conversation.ensureIssue();
    const requestedMode = pendingDraftWorkMode.current;
    if (requestedMode !== null && requestedMode !== resolved.workMode) {
      await issuesApi.update(resolved.id, { workMode: requestedMode });
    }
    pendingDraftWorkMode.current = null;
    return resolved.id;
  };
  // A cached header seed can paint during navigation, but must not redirect
  // or upload against the previous task while the requested task is loading.
  // A failed refetch of an already loaded task does not unload it.
  const loadedIssue =
    !isPlaceholderData &&
    !(error && !queriedIssue && !coreIssueQuery.data) &&
    issue &&
    issueId &&
    (issue.id.toLowerCase() === issueId.toLowerCase() ||
      issue.identifier?.toLowerCase() === issueId.toLowerCase())
      ? issue
      : null;
  const loadedIssueCompany = loadedIssue
    ? companies.find((company) => company.id === loadedIssue.companyId)
    : undefined;
  const taskRouteReady = Boolean(conversation || (
    loadedIssue &&
    issueId === (loadedIssue.identifier ?? loadedIssue.id) &&
    (!loadedIssueCompany || companyPrefix === loadedIssueCompany.issuePrefix) &&
    !hasLegacyIssueDetailQuery(location.search)
  ));
  const resolvedCompanyId = issue?.companyId ?? selectedCompanyId;
  const hasLiveConnection = useTaskRunLiveUpdates({ companyId: resolvedCompanyId, issueId: issue?.id ?? issueId, issueQueryRef: issueId ?? "pending", assigneeAgentId: issue?.assigneeAgentId });
  const externalObjectsState = useIssueExternalObjects(conversation && !conversation.issue ? null : issue?.id ?? null);
  // A closed isolated workspace no longer blocks the composer. The server reopens
  // the workspace when the next comment or resume arrives, so the composer stays
  // enabled and a hint tells the user what happens.
  const closedIsolatedWorkspaceReopenPending = useMemo(
    () =>
      Boolean(
        issue?.currentExecutionWorkspace &&
        isClosedIsolatedExecutionWorkspace(issue.currentExecutionWorkspace),
      ),
    [issue?.currentExecutionWorkspace],
  );

  const {
    data: commentPages,
    isLoading: commentsLoading,
    isError: commentsError,
    isFetchingNextPage: commentsLoadingOlder,
    hasNextPage: hasOlderComments,
    fetchNextPage: fetchOlderComments,
    refetch: refetchComments,
  } = useInfiniteQuery({
    queryKey: queryKeys.issues.comments(issueId!),
    queryFn: ({ pageParam }) =>
      issuesApi.listComments(issueId!, {
        order: "desc",
        limit: ISSUE_COMMENT_PAGE_SIZE,
        ...(pageParam ? { after: pageParam } : {}),
      }),
    enabled: !!issueId && historyExpanded,
    initialPageParam: null as string | null,
    getNextPageParam: (lastPage) =>
      getNextIssueCommentPageParam(lastPage, ISSUE_COMMENT_PAGE_SIZE),
    placeholderData: keepPreviousDataForSameQueryTail<
      InfiniteData<IssueComment[], string | null>
    >(issueId ?? "pending"),
  });
  const earlierChatComments = useConversationHistoryPages(issueId, paginatedConversation, recentComments.data?.oldestCommentId, recentComments.data?.comments ?? []);
  const commentAnchor = location.hash.startsWith("#comment-")
    ? location.hash.slice("#comment-".length)
    : null;
  const linkedCommentId = commentAnchor && isUuidLike(commentAnchor) ? commentAnchor.trim() : null;
  const windowComments = useMemo(
    () => mergeWindowComments(recentComments.data?.comments ?? [], paginatedConversation
      ? earlierChatComments.data?.pages.flatMap(page => page.comments) ?? []
      : flattenIssueCommentPages(commentPages?.pages), acknowledgedComments),
    [paginatedConversation, earlierChatComments.data?.pages, commentPages?.pages, recentComments.data?.comments, acknowledgedComments],
  );
  const linkedComment = useQuery({
    queryKey: [...queryKeys.issues.comments(issueId!), "linked", linkedCommentId],
    queryFn: ({ signal }) => issuesApi.getComment(issue!.id, linkedCommentId!, { signal }),
    enabled: !!issue && !!linkedCommentId && !historyExpanded && !windowComments.some(comment => comment.id === linkedCommentId),
  });
  useEffect(() => {
    const target = linkedComment.data;
    if (!target || !recentComments.data) return;
    // A document click changes the hash, not the reader's conversation. Keep
    // every fetched target in the observed window so that click cannot remove
    // its source row. The preview cursor still belongs to the latest reply.
    queryClient.setQueryData<IssueRecentComments>(
      [...queryKeys.issues.comments(issueId!), "recent"],
      current => !current || current.comments.some(comment => comment.id === target.id)
        ? current
        : { ...current, comments: mergeWindowComments([target], current.comments) },
    );
  }, [issueId, linkedComment.data, recentComments.data, queryClient]);
  const comments = useMemo(
    () => mergeWindowComments(linkedComment.data ? [linkedComment.data] : [], windowComments),
    [linkedComment.data, windowComments],
  );

  useLayoutEffect(() => {
    beginIssueDetailNavigation();
  }, [issueId]);

  useEffect(() => {
    if (!(import.meta.env.DEV || import.meta.env.MODE === "qa")) return;
    return reportIssueDetailWebVitals();
  }, [issueId]);

  useEffect(() => {
    if (!issue) return;
    scheduleIssueDetailPaintMeasure(
      ISSUE_DETAIL_HEADER_PAINT_MARK,
      ISSUE_DETAIL_HEADER_MEASURE,
    );
  }, [issue?.id]);

  useEffect(() => {
    if (!classicTaskInterfaceEnabled || !issue || commentsLoading) return;
    scheduleIssueDetailPaintMeasure(
      ISSUE_DETAIL_CONTENT_PAINT_MARK,
      ISSUE_DETAIL_CONTENT_MEASURE,
    );
  }, [classicTaskInterfaceEnabled, commentsLoading, issue?.id]);
  const linkedCommentPending = Boolean(
    linkedCommentId &&
    !comments.some((comment) => comment.id === linkedCommentId) &&
    !(historyExpanded ? commentsError : linkedComment.isError) &&
    (historyExpanded ? commentsLoading || hasOlderComments : linkedComment.isPending),
  );
  const shouldPrefetchOlderComments = useMemo(
    () =>
      historyExpanded && shouldAutoloadOlderIssueComments({
        activeDetailTab: detailTab,
        hasOlderComments: hasOlderComments ?? false,
        loadedCommentCount: comments.length,
        initialPageLoading: commentsLoading,
        olderPageLoading: commentsLoadingOlder,
        autoLoadLimit: ISSUE_COMMENT_AUTOLOAD_LIMIT,
      }),
    [
      comments.length,
      commentsLoading,
      commentsLoadingOlder,
      historyExpanded,
      detailTab,
      hasOlderComments,
    ],
  );
  const {
    data: interactions = [],
    isLoading: interactionsLoading,
    isError: interactionsError,
    refetch: refetchInteractions,
  } = useQuery({
    queryKey: queryKeys.issues.interactions(issueId!),
    queryFn: () => issuesApi.listInteractions(issueId!),
    enabled: !!issueId,
    // A review can be committed between the initial fetch and live-socket
    // subscription. Reconcile even after its originating run has ended.
    refetchInterval: (query) => interactionReadinessRefetchInterval(query.state.data, 20_000),
    placeholderData: keepPreviousDataForSameQueryTail<IssueThreadInteraction[]>(
      issueId ?? "pending",
    ),
  });

  const {
    data: attachments,
    isLoading: attachmentsLoading,
    isError: attachmentsError,
    refetch: refetchAttachments,
  } = useQuery({
    queryKey: queryKeys.issues.attachments(issueId!),
    queryFn: () => issuesApi.listAttachments(issueId!),
    enabled: !!issueId,
    placeholderData: keepPreviousDataForSameQueryTail<IssueAttachment[]>(
      issueId ?? "pending",
    ),
  });

  const {
    data: workProducts,
    isLoading: workProductsLoading,
    isError: workProductsError,
    refetch: refetchWorkProducts,
  } = useIssueWorkProducts(issueId);
  useEffect(() => {
    recordIssueDetailReadiness({ issue: !!loadedIssue, comments: !commentsLoading, interactions: !interactionsLoading, attachments: !attachmentsLoading, "work-products": !workProductsLoading });
  }, [issueId, loadedIssue, commentsLoading, interactionsLoading, attachmentsLoading, workProductsLoading]);

  const { data: liveRunCount = 0 } = useQuery<LiveRunForIssue[], Error, number>(
    {
      queryKey: queryKeys.issues.liveRuns(issueId!),
      queryFn: () => heartbeatsApi.liveRunsForIssue(issueId!),
      enabled: !!issueId,
      refetchInterval: (query) => liveRunRefetchInterval(hasLiveConnection, query.state, 3000),
      select: (runs) => runs.length,
      placeholderData: keepPreviousDataForSameQueryTail<LiveRunForIssue[]>(
        issueId ?? "pending",
      ),
    },
  );

  const { data: hasActiveRun = false } = useQuery<
    ActiveRunForIssue | null,
    Error,
    boolean
  >({
    queryKey: queryKeys.issues.activeRun(issueId!),
    queryFn: () => heartbeatsApi.activeRunForIssue(issueId!),
    enabled:
      !!issueId && (!!issue?.executionRunId || issue?.status === "in_progress"),
    refetchInterval: (query) => liveRunCount > 0 ? false : liveRunRefetchInterval(hasLiveConnection, query.state, 3000),
    select: (run) => !!run,
    placeholderData: keepPreviousDataForSameQueryTail<ActiveRunForIssue | null>(
      issueId ?? "pending",
    ),
  });
  const resolvedHasActiveRun = issue
    ? shouldTrackIssueActiveRun(issue) && hasActiveRun
    : hasActiveRun;
  const hasLiveRuns = liveRunCount > 0 || resolvedHasActiveRun;
  useEffect(() => {
    if (!hasLiveRuns && locallyQueuedCommentRunIds.size > 0) {
      setLocallyQueuedCommentRunIds(new Map());
    }
  }, [hasLiveRuns, locallyQueuedCommentRunIds.size]);
  const sourceBreadcrumb = useMemo(
    () =>
      readIssueDetailBreadcrumb(issueId, location.state, location.search) ?? {
        label: "Tasks",
        href: "/issues",
      },
    [issueId, location.state, location.search],
  );

  const {
    data: rawChildIssuesData,
    isLoading: childIssuesLoading,
    isError: childIssuesError,
    refetch: refetchChildIssues,
  } = useQuery({
    queryKey:
      issue?.id && resolvedCompanyId
        ? queryKeys.issues.listByDescendantRoot(resolvedCompanyId, issue.id)
        : ["issues", "parent", "pending"],
    queryFn: () =>
      issuesApi.listAll(resolvedCompanyId!, {
        descendantOf: issue!.id,
        includeBlockedBy: true,
      }),
    enabled: !!resolvedCompanyId && !!issue?.id && !issue.id.startsWith("chat:"),
    placeholderData: keepPreviousDataForSameQueryTail<Issue[]>(
      issue?.id ?? "pending",
    ),
  });
  const rawChildIssues: Issue[] = rawChildIssuesData ?? EMPTY_ISSUES;
  const createdTasksQuery = useQuery({
    queryKey: queryKeys.issues.listCreatedFromIssue(
      resolvedCompanyId ?? "pending",
      issue?.id ?? "pending",
    ),
    queryFn: () => issuesApi.listAll(resolvedCompanyId!, {
      createdFromIssueId: issue!.id,
      includeRoutineExecutions: true,
    }),
    enabled: streamlinedTaskDetailEnabled && !!resolvedCompanyId && !!issue?.id && !tasksTab,
  });

  const {
    data: rawSiblingIssuesData,
    isLoading: siblingIssuesLoading,
    isError: siblingIssuesError,
  } = useQuery({
    queryKey:
      issue?.parentId && resolvedCompanyId
        ? queryKeys.issues.listByParent(resolvedCompanyId, issue.parentId)
        : ["issues", "siblings", "pending"],
    queryFn: () =>
      issuesApi.list(resolvedCompanyId!, {
        parentId: issue!.parentId!,
        includeBlockedBy: true,
      }),
    enabled: !!resolvedCompanyId && !!issue?.parentId,
  });
  const rawSiblingIssues: Issue[] = rawSiblingIssuesData ?? EMPTY_ISSUES;
  const companyLiveRunsQueryKey = resolvedCompanyId
    ? queryKeys.liveRuns(resolvedCompanyId)
    : (["live-runs", "pending"] as const);
  const sharedCompanyLiveRuns = useSharedPollingQuery<LiveRunForIssue[]>({
    companyId: resolvedCompanyId,
    resourceKey: "live-runs",
    queryKey: companyLiveRunsQueryKey,
    enabled: !!resolvedCompanyId,
    // Event-sourced via LiveUpdatesProvider (GitHub issue 9627); no interval poll needed.
    refetchInterval: false,
    leaderOnly: true,
  });
  const { data: companyLiveRuns, dataUpdatedAt: companyLiveRunsUpdatedAt } =
    useQuery({
      queryKey: companyLiveRunsQueryKey,
      queryFn: () => heartbeatsApi.liveRunsForCompany(resolvedCompanyId!),
      enabled: sharedCompanyLiveRuns.enabled,
      refetchInterval: sharedCompanyLiveRuns.refetchInterval,
      placeholderData: keepPreviousDataForSameQueryTail<LiveRunForIssue[]>(
        resolvedCompanyId ?? "pending",
      ),
    });
  usePublishSharedQueryData(
    sharedCompanyLiveRuns,
    companyLiveRuns,
    companyLiveRunsUpdatedAt,
  );

  const { data: agents } = useQuery({
    queryKey: queryKeys.agents.list(selectedCompanyId!),
    queryFn: () => agentsApi.list(selectedCompanyId!),
    enabled: !!selectedCompanyId,
  });
  const { data: companyMembers } = useQuery({
    queryKey: queryKeys.access.companyUserDirectory(selectedCompanyId!),
    queryFn: () => accessApi.listUserDirectory(selectedCompanyId!),
    enabled: !!selectedCompanyId,
  });
  // Bounded pool of recently-updated issues to back the `@task` reference picker.
  // The picker filters this list client-side by identifier/title.
  const { data: mentionIssues = [] } = useQuery({
    queryKey: resolvedCompanyId
      ? queryKeys.issues.mentionPool(resolvedCompanyId)
      : ["issues", "mention-pool", "pending"],
    queryFn: () =>
      issuesApi.list(resolvedCompanyId!, {
        limit: 100,
        sortField: "updated",
        sortDir: "desc",
      }),
    enabled: !!resolvedCompanyId,
    staleTime: 60_000,
    placeholderData: keepPreviousDataForSameQueryTail<Issue[]>(
      resolvedCompanyId ?? "pending",
    ),
  });

  const { data: session, isFetched: sessionResolved } = useQuery({
    queryKey: queryKeys.auth.session,
    queryFn: () => authApi.getSession(),
  });

  const { data: projects } = useQuery({
    queryKey: queryKeys.projects.list(selectedCompanyId!),
    queryFn: () => projectsApi.list(selectedCompanyId!),
    enabled: !!selectedCompanyId,
  });
  const currentUserId = session?.user?.id ?? session?.session?.userId ?? null;
  useEffect(() => {
    if (!streamlinedUiEnabled || !issue || !sessionResolved) return;
    recordRecentTask(issue, currentUserId);
  }, [issue, currentUserId, sessionResolved, streamlinedUiEnabled]);
  const { data: boardAccess } = useQuery({
    queryKey: queryKeys.access.currentBoardAccess,
    queryFn: () => accessApi.getCurrentBoardAccess(),
    enabled: !!session?.user?.id,
  });
  const canManageTreeControl = Boolean(
    selectedCompanyId && boardAccess?.companyIds?.includes(selectedCompanyId),
  );
  const canResolveBoardRecoveryAction = canBoardResolveRecoveryAction(
    selectedCompanyId,
    boardAccess,
  );
  // The break-glass override reconcile is `runtime:manage`-gated server-side, not gated on the
  // recovery-resolution permission — so hide its affordance behind the matching client check.
  const canManageBoardRuntime = canBoardManageRuntime(
    selectedCompanyId,
    boardAccess,
  );
  const { data: feedbackVotes } = useQuery({
    queryKey: queryKeys.issues.feedbackVotes(issueId!),
    queryFn: () => issuesApi.listFeedbackVotes(issueId!),
    enabled: !!issueId && !!currentUserId,
  });
  const { data: instanceGeneralSettings } = useQuery({
    queryKey: queryKeys.instance.generalSettings,
    queryFn: () => instanceSettingsApi.getGeneral(),
    enabled: !!issueId,
  });
  const { data: instanceExperimentalSettings } = useQuery({
    queryKey: queryKeys.instance.experimentalSettings,
    queryFn: () => instanceSettingsApi.getExperimental(),
    enabled: !!issueId,
  });
  // Experimental Cases: linkify `PAP-C7` chips in this issue's comment bodies.
  const casesChipsEnabled = instanceExperimentalSettings?.enableCases === true;
  const feedbackDataSharingPreference =
    instanceGeneralSettings?.feedbackDataSharingPreference ?? "prompt";
  const showPlanDecompositionsSection =
    instanceExperimentalSettings?.enableIssuePlanDecompositions === true;
  const fileViewerEnabled =
    instanceExperimentalSettings?.enableExperimentalFileViewer === true;
  const { orderedProjects } = useProjectOrder({
    projects: projects ?? [],
    companyId: selectedCompanyId,
    userId: currentUserId,
  });
  const { slots: issuePluginDetailSlots } = usePluginSlots({
    slotTypes: ["detailTab"],
    entityType: "issue",
    companyId: resolvedCompanyId,
    enabled: !!resolvedCompanyId,
  });
  const issuePluginTabItems = useMemo(
    () =>
      issuePluginDetailSlots.map((slot) => ({
        value: `plugin:${slot.pluginKey}:${slot.id}`,
        label: slot.displayName,
        slot,
      })),
    [issuePluginDetailSlots],
  );
  const activePluginTab =
    issuePluginTabItems.find((item) => item.value === detailTab) ?? null;
  const {
    data: treeControlPreview,
    isFetching: treeControlPreviewLoading,
    error: treeControlPreviewError,
    refetch: refetchTreeControlPreview,
  } = useQuery({
    queryKey: [
      "issues",
      "tree-control-preview",
      issueId ?? "pending",
      treeControlMode,
    ],
    queryFn: () =>
      issuesApi.previewTreeControl(issueId!, {
        mode: treeControlMode,
        releasePolicy: {
          strategy: "manual",
        },
      }),
    enabled: treeControlOpen && !!issueId && canManageTreeControl,
    staleTime: 0,
  });
  const { data: treeControlState, error: treeControlStateError } = useQuery({
    queryKey: ["issues", "tree-control-state", issueId ?? "pending"],
    queryFn: () => issuesApi.getTreeControlState(issueId!),
    enabled: !!issueId,
  });
  const { data: activeRootPauseHolds = [] } = useQuery({
    queryKey: [
      "issues",
      "tree-holds",
      issueId ?? "pending",
      "active-pause-with-members",
    ],
    queryFn: () =>
      issuesApi.listTreeHolds(issueId!, {
        status: "active",
        mode: "pause",
        includeMembers: true,
      }),
    enabled: !!issueId && treeControlState?.activePauseHold?.isRoot === true,
  });
  const { data: activeCancelHolds = [] } = useQuery({
    queryKey: ["issues", "tree-holds", issueId ?? "pending", "active-cancel"],
    queryFn: () =>
      issuesApi.listTreeHolds(issueId!, {
        status: "active",
        mode: "cancel",
      }),
    enabled: !!issueId && canManageTreeControl,
  });

  const agentMap = useMemo(() => {
    const map = new Map<string, Agent>();
    for (const a of agents ?? []) map.set(a.id, a);
    return map;
  }, [agents]);
  const userProfileMap = useMemo(
    () => buildCompanyUserProfileMap(companyMembers?.users),
    [companyMembers?.users],
  );
  const userLabelMap = useMemo(
    () => buildCompanyUserLabelMap(companyMembers?.users),
    [companyMembers?.users],
  );
  const canManagePrivacy = canManageIssuePrivacy(issue, currentUserId, boardAccess);
  // Role-based principals for the share sheet's implicit rows (no revoke).
  const privacyImplicitPrincipals = useMemo<ShareSheetImplicitPrincipal[]>(() => {
    if (!issue) return [];
    const list: ShareSheetImplicitPrincipal[] = [];
    const seen = new Set<string>();
    const pushUser = (userId: string | null, roleLabel: string) => {
      if (!userId || seen.has(`user:${userId}`)) return;
      seen.add(`user:${userId}`);
      const profile = userProfileMap.get(userId);
      list.push({
        id: `user:${userId}`,
        displayName: profile?.label ?? userId.slice(0, 5),
        roleLabel,
        avatarUrl: profile?.image ?? null,
      });
    };
    const pushAgent = (agentId: string | null, roleLabel: string) => {
      if (!agentId || seen.has(`agent:${agentId}`)) return;
      seen.add(`agent:${agentId}`);
      const agent = agentMap.get(agentId);
      list.push({
        id: `agent:${agentId}`,
        displayName: agent?.name ?? agentId.slice(0, 8),
        roleLabel,
      });
    };
    pushUser(issue.responsibleUserId, "Owner");
    pushAgent(issue.assigneeAgentId, "Assignee");
    pushUser(issue.assigneeUserId, "Assignee");
    return list;
  }, [issue, userProfileMap, agentMap]);
  const mentionOptions = useMemo<MentionOption[]>(() => {
    return buildMarkdownMentionOptions({
      agents,
      projects: orderedProjects,
      members: companyMembers?.users,
      issues: mentionIssues,
    });
  }, [agents, companyMembers?.users, orderedProjects, mentionIssues]);

  const resolvedProject = useMemo(
    () =>
      issue?.projectId
        ? (orderedProjects.find((project) => project.id === issue.projectId) ??
          issue.project ??
          null)
        : null,
    [issue?.project, issue?.projectId, orderedProjects],
  );
  const childIssues = useMemo(() => {
    const descendants = issue?.id
      ? filterIssueDescendants(issue.id, rawChildIssues)
      : rawChildIssues;
    return [...descendants].sort(
      (a, b) =>
        new Date(a.createdAt).getTime() - new Date(b.createdAt).getTime(),
    );
  }, [issue?.id, rawChildIssues]);
  const resolvedTasksTab = useMemo(() => {
    if (tasksTab) return tasksTab;
    if (!streamlinedTaskDetailEnabled) return undefined;
    const createdTasks = createdTasksQuery.data ?? EMPTY_ISSUES;
    const hasError = createdTasksQuery.isError || childIssuesError;
    return {
      count: new Set([
        ...(issue?.createdFrom ? [issue.createdFrom.issue] : []),
        ...(issue?.ancestors ?? []),
        ...childIssues,
        ...createdTasks,
      ].map((task) => task.id)).size,
      hasError,
      content: (
        <TaskDetailTasksPanel
          ancestors={issue?.ancestors}
          createdFrom={issue?.createdFrom}
          issueLinkState={resolvedIssueDetailState ?? location.state}
          subtasks={childIssues}
          createdTasks={createdTasks}
          projects={projects ?? []}
          isLoading={createdTasksQuery.isLoading || childIssuesLoading}
          hasError={hasError}
          onRetry={() => {
            void createdTasksQuery.refetch();
            void refetchChildIssues();
          }}
        />
      ),
    };
  }, [
    tasksTab,
    issue?.ancestors,
    issue?.createdFrom,
    resolvedIssueDetailState,
    location.state,
    streamlinedTaskDetailEnabled,
    childIssues,
    childIssuesLoading,
    childIssuesError,
    refetchChildIssues,
    projects,
    createdTasksQuery.data,
    createdTasksQuery.isError,
    createdTasksQuery.isLoading,
    createdTasksQuery.refetch,
  ]);
  const liveIssueIds = useMemo(
    () =>
      collectLiveIssueIds(
        companyLiveRuns,
        issue ? [issue, ...childIssues] : childIssues,
      ),
    [childIssues, companyLiveRuns, issue],
  );
  const issuePanelKey = useMemo(
    () => buildIssuePropertiesPanelKey(issue ?? null, childIssues),
    [childIssues, issue],
  );
  const panelIssue = useMemo(() => issue ?? null, [issue?.id, issuePanelKey]);
  const panelChildIssues = useMemo(() => childIssues, [issuePanelKey]);
  // Planning tasks start as chat-only until a plan exists, then reveal the
  // sidebar already on the Plan tab. The onboarding first task keeps the same
  // behavior even if its work mode changes. We gate the panel *mount* (withhold
  // the panel content) rather than flipping the global `panelVisible` preference
  // — that preference persists to localStorage and would leak "hidden" into every
  // other task. The user can still opt in early via the "Show properties" header
  // button, which sets a per-issue override (keyed on the issue id so it resets
  // across navigations).
  const isOnboardingFirstTask =
    taskChatShellEnabled &&
    issue?.originKind === ONBOARDING_FIRST_TASK_ORIGIN_KIND;
  const shouldDeferPanelUntilPlan =
    taskChatShellEnabled &&
    (isOnboardingFirstTask || issue?.workMode === "planning");
  const { data: deferredPanelPlanDoc } = useIssuePlanDocument(
    shouldDeferPanelUntilPlan ? issue?.id : null,
  );
  const [panelBeforePlanOverrideIssueId, setPanelBeforePlanOverrideIssueId] =
    useState<string | null>(null);
  const panelBeforePlanOverride =
    panelBeforePlanOverrideIssueId !== null &&
    panelBeforePlanOverrideIssueId === issue?.id;
  const suppressPanelUntilPlan =
    shouldDeferPanelUntilPlan &&
    shouldSuppressTaskPanelUntilPlan({
      deferredPlanAvailable: Boolean(deferredPanelPlanDoc),
      panelBeforePlanOverride,
    });
  const openTaskSidePanel = useCallback(() => {
    if (suppressPanelUntilPlan && issue?.id) {
      setPanelBeforePlanOverrideIssueId(issue.id);
    }
    setPanelVisible(true);
  }, [issue?.id, setPanelVisible, suppressPanelUntilPlan]);
  const handleAttachmentOpened = useCallback(() => setOpenAttachment(null), []);
  const handleOpenTextAttachment = useCallback((id: string, title: string) => {
    if (!issue?.id) return;
    setOpenAttachment({ issueId: issue.id, id, title, requestId: Date.now() });
    openTaskSidePanel();
    if (isMobile) setMobilePropsOpen(true);
  }, [issue?.id, openTaskSidePanel, isMobile]);
  const decisionAttachmentOpened = useRef<string | null>(null);
  useEffect(() => {
    if (!coordinatorWorkspaceEnabled || !issue?.id) return;
    const params = new URLSearchParams(location.hash.split("&").slice(1).join("&"));
    const attachmentId = params.get("attachment") ?? new URLSearchParams(location.search).get("attachmentId");
    if (!attachmentId) { decisionAttachmentOpened.current = null; return; }
    const key = `${issue.id}:${location.key}:${attachmentId}`;
    if (decisionAttachmentOpened.current === key) return;
    const attachment = attachments?.find(item => item.id === attachmentId);
    if (!attachment) return;
    decisionAttachmentOpened.current = key;
    handleOpenTextAttachment(attachment.id, attachment.originalFilename ?? "Attachment");
  }, [coordinatorWorkspaceEnabled, issue?.id, location.hash, location.search, location.key, attachments, handleOpenTextAttachment]);

  // History links restore the exact point of decision while its artifact opens
  // in the side pane. Wait for the real thread to mount, without guessing a row.
  useEffect(() => {
    if (!issue?.id) return;
    const anchor = taskChatHashAnchor(location.hash);
    if (!anchor || (!anchor.startsWith("interaction-") && !anchor.startsWith("decision-"))) return;
    if (!coordinatorWorkspaceEnabled && !anchor.startsWith("decision-")) return;
    const focusDecision = () => {
      const target = document.getElementById(anchor);
      if (!target) return false;
      target.tabIndex = -1;
      target.scrollIntoView({ block: "center", behavior: "instant" });
      target.focus({ preventScroll: true });
      return true;
    };
    if (focusDecision()) return;
    const observer = new MutationObserver(() => { if (focusDecision()) observer.disconnect(); });
    observer.observe(document.getElementById("main-content") ?? document.body, { subtree: true, childList: true });
    const timeout = window.setTimeout(() => observer.disconnect(), 10_000);
    return () => { observer.disconnect(); window.clearTimeout(timeout); };
  }, [coordinatorWorkspaceEnabled, issue?.id, location.hash, location.key]);
  const taskPanelAccountScope = coordinatorWorkspaceEnabled ? `coordinator:${currentUserId ?? "anonymous"}` : currentUserId ?? "anonymous";
  const { panels: pluginPanels, isLoading: pluginPanelsLoading } = useTaskPluginPanels(issue, taskChatShellEnabled);
  const revealedPluginPanels = useRef(new Set<string>());
  const openedPluginPanelKeys = useRef(new Set<string>());
  const dismissedPluginPanelKeys = useRef(new Set<string>());
  useEffect(() => {
    for (const panel of pluginPanels) {
      if (!panel.autoOpen || !panel.runId) continue;
      const key = taskPluginPanelActivationKey(panel, taskPanelAccountScope, issue!);
      if (revealedPluginPanels.current.has(key)) continue;
      revealedPluginPanels.current.add(key);
      if (dismissedPluginPanelKeys.current.has(key)) continue;
      openTaskSidePanel();
      if (isMobile) setMobilePropsOpen(true);
    }
  }, [pluginPanels, taskPanelAccountScope, issue?.companyId, issue?.id, openTaskSidePanel, isMobile]);
  const browserQuery = useTaskBrowsers(issue?.id);
  const { openBrowserId, openBrowser: setOpenBrowserId, acknowledgeBrowserOpened: handleBrowserOpened } =
    useBrowserArrivals(currentUserId ?? "anonymous", issue?.id, browserQuery.data);
  useEffect(() => {
    if (!openBrowserId) return;
    openTaskSidePanel();
    if (isMobile) setMobilePropsOpen(true);
  }, [openBrowserId, openTaskSidePanel, isMobile]);
  const handleOpenSkill = useCallback((skillId: string, name: string) => {
    const next = openSkillPanelState(
      { panelBeforePlanOverrideIssueId },
      { id: skillId, name }, issue?.id ?? null, suppressPanelUntilPlan,
    );
    setOpenSkill(next.skill);
    setPanelBeforePlanOverrideIssueId(next.panelBeforePlanOverrideIssueId);
    setPanelVisible(true);
    if (isMobile) setMobilePropsOpen(true);
  }, [isMobile, issue?.id, panelBeforePlanOverrideIssueId, setPanelVisible, suppressPanelUntilPlan]);
  const registerArtifactTab = useCallback(() => {
    if (!issue?.id) return;
    setArtifactsOpenRequest((previous) => ({
      issueId: issue.id,
      requestId: (previous?.requestId ?? 0) + 1,
    }));
  }, [issue?.id]);
  const handleArtifactsOpened = useCallback((requestId: number) => {
    setArtifactsOpenRequest((request) => request?.requestId === requestId
      ? { ...request, handled: true } : request);
  }, []);
  useTaskArtifactArrival({
    issueId: taskChatShellEnabled ? issue?.id : undefined,
    attachments,
    workProducts,
    documents: issue?.documentSummaries,
    onArrival: registerArtifactTab,
  });
  const toggleTaskSidePanel = useCallback(() => {
    if (!panelVisible || suppressPanelUntilPlan) {
      openTaskSidePanel();
      return;
    }
    setPanelVisible(false);
  }, [
    openTaskSidePanel,
    panelVisible,
    setPanelVisible,
    suppressPanelUntilPlan,
  ]);
  const showRichSubIssuesSection = shouldRenderRichSubIssuesSection(
    childIssuesLoading,
    childIssues.length,
  );
  const siblingNavigation = useMemo(
    () =>
      issue &&
      !childIssuesLoading &&
      !siblingIssuesLoading &&
      !siblingIssuesError
        ? buildIssueSiblingNavigation(issue, rawSiblingIssues, childIssues)
        : null,
    [
      childIssues,
      childIssuesLoading,
      issue,
      rawSiblingIssues,
      siblingIssuesError,
      siblingIssuesLoading,
    ],
  );
  const openNewSubIssue = useCallback(() => {
    if (!issue) return;
    openNewIssue(buildSubIssueDefaultsForViewer(issue, currentUserId));
  }, [currentUserId, issue, openNewIssue]);

  const commentReassignOptions = useMemo(() => {
    const options: Array<{ id: string; label: string; searchText?: string }> =
      [];
    options.push(
      ...buildCompanyUserInlineOptions(companyMembers?.users, {
        excludeUserIds: [currentUserId],
      }),
    );
    const activeAgents = [...(agents ?? [])]
      .filter(isAgentTaskTarget)
      .sort((a, b) => a.name.localeCompare(b.name));
    for (const agent of activeAgents) {
      options.push({ id: `agent:${agent.id}`, label: agent.name });
    }
    if (currentUserId) {
      options.push({ id: `user:${currentUserId}`, label: "Me" });
    }
    return options;
  }, [agents, companyMembers?.users, currentUserId]);

  const actualAssigneeValue = useMemo(
    () => assigneeValueFromSelection(issue ?? {}),
    [issue],
  );

  const { data: assignmentActivity } = useQuery({
    queryKey: queryKeys.issues.activity(issueId!),
    queryFn: () => activityApi.forIssue(issueId!),
    enabled: Boolean(issueId && currentUserId && issue?.assigneeUserId === currentUserId),
  });

  const suggestedAssigneeValue = useMemo(
    () =>
      suggestedCommentAssigneeValue(
        issue ?? {},
        mergeIssueComments(comments ?? [], optimisticComments),
        currentUserId,
        undefined,
        assignmentActivity,
      ),
    [issue, comments, optimisticComments, currentUserId, assignmentActivity],
  );

  const threadComments = useMemo(
    () =>
      mergeIssueComments(comments ?? [], optimisticComments)
      .filter(comment => !(comment.authorType === "system" && comment.metadata?.recoveryResponsibility === "system"))
      .map((comment) => {
        if ("clientId" in comment && comment.clientId)
          commentRenderKeys.current.set(comment.id, comment.clientId);
        const clientId = commentRenderKeys.current.get(comment.id);
        return clientId ? { ...comment, clientId } : comment;
      }),
    [comments, optimisticComments],
  );
  const breadcrumbTitle = issue?.title ?? issueId ?? "Task";
  const breadcrumbIdentifier =
    issue?.identifier ?? issueHeaderSeed?.identifier ?? undefined;
  const breadcrumbStatus = issue?.status;
  const breadcrumbBlockerAttention = issue?.blockerAttention;
  // Stable identity for the breadcrumb status glyph. The glyph's shape/colour
  // depend on status (+ covered state), and its accessible label is derived
  // from the blocker counts — so the key signs over the full blockerAttention,
  // not just `state`, to avoid a stale label when counts change.
  const breadcrumbStatusKey = breadcrumbStatus
    ? `${breadcrumbStatus}|${issue?.externalConversationState ?? ""}|${JSON.stringify(breadcrumbBlockerAttention ?? null)}`
    : undefined;
  const breadcrumbStatusLeading = useMemo(
    () =>
      breadcrumbStatus ? (
        <StatusIcon
          status={breadcrumbStatus}
          externalConversationState={issue?.externalConversationState}
          className="size-3"
          blockerAttention={breadcrumbBlockerAttention}
        />
      ) : undefined,
    // `breadcrumbStatusKey` is a complete signature of the inputs below.
    // eslint-disable-next-line react-hooks/exhaustive-deps
    [breadcrumbStatusKey],
  );
  const issueCacheRefs = useMemo(() => {
    const refs = new Set<string>();
    if (issueId) refs.add(issueId);
    if (issue?.id) refs.add(issue.id);
    if (issue?.identifier) refs.add(issue.identifier);
    return [...refs];
  }, [issue?.id, issue?.identifier, issueId]);

  const invalidateIssueDetail = useCallback(() => {
    for (const ref of issueCacheRefs) {
      queryClient.invalidateQueries({ queryKey: queryKeys.issues.detail(ref) });
      queryClient.invalidateQueries({
        queryKey: queryKeys.issues.activity(ref),
      });
      queryClient.invalidateQueries({
        queryKey: queryKeys.issues.interactions(ref),
      });
    }
  }, [issueCacheRefs, queryClient]);
  const invalidateIssueThreadLazily = useCallback(() => {
    for (const ref of issueCacheRefs) {
      queryClient.invalidateQueries({
        queryKey: queryKeys.issues.detail(ref),
        refetchType: "inactive",
      });
      queryClient.invalidateQueries({
        queryKey: queryKeys.issues.activity(ref),
        refetchType: "inactive",
      });
      queryClient.invalidateQueries({
        queryKey: queryKeys.issues.interactions(ref),
        refetchType: "inactive",
      });
    }
  }, [issueCacheRefs, queryClient]);

  const invalidateIssueRunState = useCallback(() => {
    for (const ref of issueCacheRefs) {
      queryClient.invalidateQueries({ queryKey: queryKeys.issues.runs(ref) });
      queryClient.invalidateQueries({
        queryKey: queryKeys.issues.liveRuns(ref),
      });
      queryClient.invalidateQueries({
        queryKey: queryKeys.issues.activeRun(ref),
      });
    }
  }, [issueCacheRefs, queryClient]);

  const invalidateIssueDocumentAnnotationState = useCallback(() => {
    queryClient.invalidateQueries({
      queryKey: ["issues", "document-annotations", issueId!],
    });
    queryClient.invalidateQueries({
      queryKey: queryKeys.issues.documents(issueId!),
    });
  }, [issueId, queryClient]);

  const removeCommentFromCache = useCallback(
    async (commentId: string) => {
      // Cancel reads started before deletion so they cannot restore stale rows.
      await Promise.all(issueCacheRefs.map((ref) =>
        queryClient.cancelQueries({ queryKey: queryKeys.issues.comments(ref) }),
      ));
      for (const ref of issueCacheRefs) {
        queryClient.setQueryData<IssueComment | null>(
          [...queryKeys.issues.comments(ref), "linked", commentId],
          current => current ? null : current,
        );
        queryClient.setQueryData<InfiniteData<IssueComment[], string | null>>(
          queryKeys.issues.comments(ref),
          (current) => current && { ...current, pages: removeIssueCommentFromPages(current.pages, commentId) },
        );
        queryClient.setQueryData<IssueComment[]>(queryKeys.issues.acknowledgedComments(ref), current =>
          current?.filter(comment => comment.id !== commentId),
        );
        queryClient.setQueryData<InfiniteData<ConversationHistoryPage, string | null>>(
          queryKeys.issues.earlierComments(ref), current => current && {
            ...current, pages: current.pages.map(page => ({ ...page, comments: page.comments.filter(comment => comment.id !== commentId) })),
          },
        );
        queryClient.setQueryData<IssueRecentComments>(
          [...queryKeys.issues.comments(ref), "recent"],
          (current) => {
            if (!current) return current;
            const comments = mergeWindowComments(current.comments.filter((comment) => comment.id !== commentId));
            return {
              ...current,
              comments,
              latestCommentId: current.latestCommentId === commentId
                ? comments.at(-1)?.id ?? null
                : current.latestCommentId,
            };
          },
        );
      }
    },
    [issueCacheRefs, queryClient],
  );

  const clearCommentHashIfCurrent = useCallback(
    (commentId: string) => {
      if (typeof window === "undefined") return;
      if (window.location.hash !== `#comment-${commentId}`) return;
      window.history.replaceState(
        null,
        "",
        `${location.pathname}${location.search}`,
      );
    },
    [location.pathname, location.search],
  );

  const upsertCommentInCache = useCallback(
    async (comment: IssueComment) => {
      await Promise.all(issueCacheRefs.map((ref) =>
        queryClient.cancelQueries({ queryKey: queryKeys.issues.comments(ref) }),
      ));
      for (const ref of issueCacheRefs) {
        queryClient.setQueryData<IssueComment | null>(
          [...queryKeys.issues.comments(ref), "linked", comment.id],
          current => current ? comment : current,
        );
        queryClient.setQueryData<
          InfiniteData<IssueComment[], string | null> | undefined
        >(queryKeys.issues.comments(ref), (current) =>
          current
            ? {
                ...current,
                pages: upsertIssueCommentInPages(current.pages, comment),
              }
            : current,
        );
        queryClient.setQueryData<IssueComment[]>(queryKeys.issues.acknowledgedComments(ref), current =>
          current?.map(existing => existing.id === comment.id ? comment : existing),
        );
        queryClient.setQueryData<InfiniteData<ConversationHistoryPage, string | null>>(
          queryKeys.issues.earlierComments(ref), current => current && {
            ...current, pages: current.pages.map(page => ({ ...page, comments: page.comments.map(existing => existing.id === comment.id ? comment : existing) })),
          },
        );
        queryClient.setQueryData<IssueRecentComments>(
          [...queryKeys.issues.comments(ref), "recent"],
          (current) => current && {
            ...current,
            comments: current.comments.map((existing) => existing.id === comment.id ? comment : existing),
          },
        );
      }
    },
    [issueCacheRefs, queryClient],
  );

  const restoreQueuedCommentDraft = useCallback((body: string) => {
    commentComposerRef.current?.restoreDraft(body);
  }, []);

  const invalidateIssueCollections = useCallback(() => {
    if (selectedCompanyId) {
      queryClient.invalidateQueries({
        queryKey: queryKeys.issues.list(selectedCompanyId),
      });
      queryClient.invalidateQueries({
        queryKey: queryKeys.issues.listMineByMe(selectedCompanyId),
      });
      queryClient.invalidateQueries({
        queryKey: queryKeys.issues.listTouchedByMe(selectedCompanyId),
      });
      queryClient.invalidateQueries({
        queryKey: queryKeys.issues.listUnreadTouchedByMe(selectedCompanyId),
      });
      queryClient.invalidateQueries({
        queryKey: queryKeys.sidebarBadges(selectedCompanyId),
      });
    }
  }, [queryClient, selectedCompanyId]);
  const undoInboxArchive = useCallback(
    async (
      id: string,
      companyId: string | undefined,
      previousData: InboxIssueCacheSnapshot,
    ) => {
      if (companyId) {
        await cancelInboxIssueQueries(queryClient, companyId);
        clearLocalInboxArchive(companyId, id);
        restoreIssueToInboxCaches(queryClient, previousData, id);
      }

      try {
        await issuesApi.unarchiveFromInbox(id);
        pushToast({ title: "Task restored to inbox", tone: "success" });
      } catch (error) {
        if (companyId) {
          beginLocalInboxArchive(companyId, id);
          removeIssueFromInboxCaches(queryClient, companyId, id);
          boundLocalInboxArchive(companyId, id);
        }
        pushToast({
          title: "Undo failed",
          body:
            error instanceof Error
              ? error.message
              : "Unable to restore this task to the inbox",
          tone: "error",
        });
      } finally {
        if (companyId) {
          await invalidateInboxIssueQueries(queryClient, companyId);
        }
      }
    },
    [pushToast, queryClient],
  );
  const upsertInteractionInCache = useCallback(
    (interaction: IssueThreadInteraction) => {
      queryClient.setQueryData<IssueThreadInteraction[] | undefined>(
        queryKeys.issues.interactions(issueId!),
        (current) => {
          const existing = current ?? [];
          const next = existing.filter((entry) => entry.id !== interaction.id);
          next.push(interaction);
          next.sort((left, right) => {
            const createdAtDelta =
              new Date(left.createdAt).getTime() -
              new Date(right.createdAt).getTime();
            return createdAtDelta === 0
              ? left.id.localeCompare(right.id)
              : createdAtDelta;
          });
          return next;
        },
      );
      queryClient.invalidateQueries({ queryKey: ["issues", "pending-questions"] });
      queryClient.invalidateQueries({ queryKey: ["issues", "decision-receipts"] });
      queryClient.invalidateQueries({ queryKey: queryKeys.attention(interaction.companyId) });
    },
    [issueId, queryClient],
  );

  const mergeIssueResponseIntoCaches = useCallback(
    (refs: Iterable<string>, nextIssue: Issue) => {
      queryClient.setQueriesData<Issue>(
        { queryKey: ["issues", "detail"] },
        (cached) =>
          cached && matchesIssueRef(cached, refs)
            ? { ...cached, ...nextIssue }
            : cached,
      );

      if (!selectedCompanyId) return;
      queryClient.setQueryData<Issue[] | undefined>(
        queryKeys.issues.list(selectedCompanyId),
        (cached) =>
          cached?.map((item) =>
            matchesIssueRef(item, refs) ? { ...item, ...nextIssue } : item,
          ),
      );
    },
    [queryClient, selectedCompanyId],
  );

  const markIssueRead = useMutation({
    mutationFn: (id: string) => issuesApi.markRead(id),
    onSuccess: () => {
      if (selectedCompanyId) {
        queryClient.invalidateQueries({
          queryKey: queryKeys.issues.listMineByMe(selectedCompanyId),
        });
        queryClient.invalidateQueries({
          queryKey: queryKeys.issues.listTouchedByMe(selectedCompanyId),
        });
        queryClient.invalidateQueries({
          queryKey: queryKeys.issues.listUnreadTouchedByMe(selectedCompanyId),
        });
        queryClient.invalidateQueries({
          queryKey: queryKeys.sidebarBadges(selectedCompanyId),
        });
      }
    },
  });

  const updateIssueMutation = useUpdateIssueMutation({
    companyId: selectedCompanyId,
    onSuccess: ({
      comment: _comment,
      changes: _changes,
      blockedByIssueIds: _blockedByIssueIds,
      ...nextIssue
    }, { data }) => {
      if (Object.prototype.hasOwnProperty.call(data, "projectId")) {
        trackRecentProject(nextIssue.projectId ?? "", nextIssue.companyId);
      }
      const issueRefs = new Set<string>([issueId!, nextIssue.id]);
      if (nextIssue.identifier) issueRefs.add(nextIssue.identifier);
      mergeIssueResponseIntoCaches(issueRefs, nextIssue);
      if (streamlinedUiEnabled && sessionResolved) {
        recordRecentTask(nextIssue, currentUserId);
      }
      queryClient.invalidateQueries({
        queryKey: queryKeys.issues.activity(issueId!),
      });
      invalidateIssueCollections();
    },
  });
  // This page always updates its own issue.
  const updateIssue = useMemo(() => ({
    mutate: (data: Record<string, unknown>, options?: Parameters<typeof updateIssueMutation.mutate>[1]) =>
      updateIssueMutation.mutate({ id: issueId!, data }, options),
    mutateAsync: (data: Record<string, unknown>) =>
      updateIssueMutation.mutateAsync({ id: issueId!, data }),
    isPending: updateIssueMutation.isPending,
    variables: updateIssueMutation.variables?.data,
  }), [issueId, updateIssueMutation]);
  const resolveRecoveryAction = useMutation({
    mutationFn: (data: {
      actionId?: string;
      outcome: ResolveRecoveryActionOutcome;
      sourceIssueStatus: "todo" | "done" | "in_review" | "blocked";
      resolutionNote?: string | null;
    }) => issuesApi.resolveRecoveryAction(issueId!, data),
    onSuccess: ({ issue: nextIssue }) => {
      const issueRefs = new Set<string>([issueId!, nextIssue.id]);
      if (nextIssue.identifier) issueRefs.add(nextIssue.identifier);
      mergeIssueResponseIntoCaches(issueRefs, nextIssue);
      queryClient.invalidateQueries({
        queryKey: queryKeys.issues.activity(issueId!),
      });
      invalidateIssueCollections();
    },
    onError: (err) => {
      pushToast({
        title: "Recovery resolution failed",
        body:
          err instanceof Error
            ? err.message
            : "Unable to resolve recovery action",
        tone: "error",
      });
    },
    onSettled: () => {
      queryClient.invalidateQueries({
        queryKey: queryKeys.issues.detail(issueId!),
      });
      if (selectedCompanyId) {
        queryClient.invalidateQueries({
          queryKey: queryKeys.issues.list(selectedCompanyId),
        });
      }
    },
  });
  // The inline notice owns feedback; do not also emit a global error toast.
  const retryDispositionRecovery = useMutation({
    mutationFn: async (actionId: string) => {
      const result = await issuesApi.resolveRecoveryAction(issueId!, {
        actionId,
        outcome: "restored",
        sourceIssueStatus: "todo",
      });
      if (
        result.issue.status !== "todo" ||
        result.issue.assigneeAgentId !== result.recoveryAction.returnOwnerAgentId
      ) {
        throw new Error("The task’s state has changed. Refresh to see its current state.");
      }
      return result;
    },
    onSuccess: ({ issue: nextIssue }) => {
      const issueRefs = new Set<string>([issueId!, nextIssue.id]);
      if (nextIssue.identifier) issueRefs.add(nextIssue.identifier);
      mergeIssueResponseIntoCaches(issueRefs, nextIssue);
      invalidateIssueCollections();
    },
    onSettled: () => {
      for (const queryKey of [
        queryKeys.issues.detail(issueId!),
        queryKeys.issues.activity(issueId!),
        queryKeys.issues.runs(issueId!),
        queryKeys.issues.liveRuns(issueId!),
      ]) {
        void queryClient.invalidateQueries({ queryKey });
      }
    },
  });
  const executeTreeControl = useMutation({
    onMutate: () => setTreeControlWakeWarning(null),
    mutationFn: async ({
      mode,
      scope,
      runId,
      wakeAgents = false,
    }: {
      mode: IssueTreeControlMode;
      scope: "leaf" | "subtree";
      runId?: string;
      wakeAgents?: boolean;
      feedback?: "composer";
    }) => {
      if (mode === "resume") {
        const pauseHoldId = treeControlState?.activePauseHold?.holdId;
        if (!pauseHoldId) {
          throw new Error(
            "No active subtree pause hold is available to resume.",
          );
        }
        const releasedHold = await issuesApi.releaseTreeHold(
          issueId!,
          pauseHoldId,
          {
            reason: null,
            metadata: {
              wakeAgents,
            },
          },
        );
        return { kind: "release" as const, hold: releasedHold };
      }
      const created = await issuesApi.createTreeHold(issueId!, {
        mode,
        reason: null,
        releasePolicy: {
          strategy: "manual",
          ...(mode === "pause"
            ? {
                note: scope === "leaf" ? "leaf_pause" : "full_pause",
              }
            : {}),
        },
        ...(runId
          ? { metadata: { source: "issue_active_run_control", runId } }
          : {}),
        ...(mode === "restore" ? { metadata: { wakeAgents } } : {}),
      });
      if (mode === "pause") {
        // Show the hold promptly; keep Stop pending until termination is verified.
        void queryClient.invalidateQueries({
          queryKey: ["issues", "tree-control-state", issueId ?? "pending"],
        });
        await waitForStoppedRuns(
          created.preview.activeRuns.map((run) => run.id),
        );
      }
      return {
        kind: "create" as const,
        hold: created.hold,
        preview: created.preview,
      };
    },
    onSuccess: (result) => {
      if (result.kind === "release" && result.hold.wakeFailures?.length) {
        setTreeControlWakeWarning(
          `Pause released, but ${result.hold.wakeFailures.length} ${result.hold.wakeFailures.length === 1 ? "task" : "tasks"} could not start. ${result.hold.wakeFailures[0].message} Check the affected agents and try starting them again.`,
        );
      }
      setTreeControlOpen(false);
      setTreeControlWakeAgentsOnResume(false);
    },
    onSettled: async () => {
      await Promise.all([
        queryClient.invalidateQueries({
          queryKey: queryKeys.issues.detail(issueId!),
        }),
        queryClient.invalidateQueries({
          queryKey: queryKeys.issues.activity(issueId!),
        }),
        queryClient.invalidateQueries({
          queryKey: queryKeys.issues.liveRuns(issueId!),
        }),
        queryClient.invalidateQueries({
          queryKey: queryKeys.issues.activeRun(issueId!),
        }),
        queryClient.invalidateQueries({
          queryKey: queryKeys.issues.runs(issueId!),
        }),
        queryClient.invalidateQueries({
          queryKey: ["issues", "tree-control-state", issueId ?? "pending"],
        }),
        queryClient.invalidateQueries({
          queryKey: ["issues", "tree-holds", issueId ?? "pending"],
        }),
        queryClient.invalidateQueries({
          queryKey: ["issues", "tree-control-preview", issueId ?? "pending"],
        }),
      ]);
      if (selectedCompanyId) {
        await Promise.all([
          queryClient.invalidateQueries({
            queryKey: queryKeys.issues.list(selectedCompanyId),
          }),
          ...(issue?.id
            ? [
                queryClient.invalidateQueries({
                  queryKey: queryKeys.issues.listByParent(
                    selectedCompanyId,
                    issue.id,
                  ),
                }),
                queryClient.invalidateQueries({
                  queryKey: queryKeys.issues.listByDescendantRoot(
                    selectedCompanyId,
                    issue.id,
                  ),
                }),
              ]
            : []),
        ]);
      }
    },
  });
  const stopResponse = useMutation({
    mutationFn: async (runId: string) => {
      await heartbeatsApi.cancel(runId);
      await waitForStoppedRuns([runId]);
    },
    onSettled: () => Promise.all([
      queryClient.invalidateQueries({ queryKey: queryKeys.issues.detail(issueId!) }),
      queryClient.invalidateQueries({ queryKey: queryKeys.issues.runs(issueId!) }),
    ]),
  });
  const stopAndFinalizeRun = useMutation({
    mutationFn: async ({
      runId,
      status,
    }: {
      runId: string;
      status: "cancelled" | "done";
    }) => {
      await heartbeatsApi.cancel(runId);
      try {
        return await issuesApi.update(issueId!, { status });
      } catch (err) {
        throw createRunCancelledStatusUpdateError(err);
      }
    },
    onSuccess: ({ comment: _comment, ...nextIssue }, { status }) => {
      const issueRefs = new Set<string>([issueId!, nextIssue.id]);
      if (nextIssue.identifier) issueRefs.add(nextIssue.identifier);
      mergeIssueResponseIntoCaches(issueRefs, nextIssue);
      queryClient.invalidateQueries({
        queryKey: queryKeys.issues.activity(issueId!),
      });
      invalidateIssueRunState();
      invalidateIssueCollections();
      pushToast({
        title:
          status === "done"
            ? "Run stopped and task done"
            : "Run stopped and task cancelled",
        tone: "success",
      });
    },
    onError: (err, { status }) => {
      const runWasStopped = didRunCancelBeforeStatusUpdateFail(err);
      pushToast({
        title: runWasStopped
          ? "Run stopped; task update failed"
          : status === "done"
            ? "Stop and done failed"
            : "Stop and cancel failed",
        body:
          err instanceof Error
            ? err.message
            : "Unable to stop the run and update the task",
        tone: "error",
      });
    },
    onSettled: (_data, err) => {
      queryClient.invalidateQueries({
        queryKey: queryKeys.issues.detail(issueId!),
      });
      if (err) invalidateIssueRunState();
      if (selectedCompanyId) {
        queryClient.invalidateQueries({
          queryKey: queryKeys.issues.list(selectedCompanyId),
        });
      }
    },
  });
  const handleIssuePropertiesUpdate = useCallback(
    (data: Record<string, unknown>) => {
      updateIssue.mutate(data);
    },
    [updateIssue.mutate],
  );

  const updateChildIssue = useMutation({
    mutationFn: ({ id, data }: { id: string; data: Record<string, unknown> }) =>
      issuesApi.update(id, data),
    onSuccess: () => {
      if (resolvedCompanyId) {
        queryClient.invalidateQueries({
          queryKey: ["issues", resolvedCompanyId],
        });
        queryClient.invalidateQueries({
          queryKey: queryKeys.sidebarBadges(resolvedCompanyId),
        });
      }
    },
    onError: (err) => {
      pushToast({
        title: "Task update failed",
        body:
          err instanceof Error
            ? err.message
            : "Unable to save sub-task changes",
        tone: "error",
      });
    },
  });
  const handleChildIssueUpdate = useCallback(
    (id: string, data: Record<string, unknown>) => {
      updateChildIssue.mutate({ id, data });
    },
    [updateChildIssue.mutate],
  );

  const subTasksTree = useMemo(
    () =>
      taskChatShellEnabled &&
      !streamlinedTaskDetailEnabled &&
      issue &&
      showRichSubIssuesSection ? (
        <IssuesList
          issues={childIssues}
          isLoading={childIssuesLoading}
          agents={agents}
          projects={projects}
          liveIssueIds={liveIssueIds}
          projectId={issue.projectId ?? undefined}
          viewStateKey={`paperclip:issue-detail:${issue.id}:subissues-view`}
          issueLinkState={resolvedIssueDetailState ?? location.state}
          searchFilters={{ descendantOf: issue.id, includeBlockedBy: true }}
          searchWithinLoadedIssues
          baseCreateIssueDefaults={buildSubIssueDefaultsForViewer(
            issue,
            currentUserId,
          )}
          createIssueLabel="Sub-task"
          defaultSortField="workflow"
          showProgressSummary
          parentIssueIdForCostSummary={issue.id}
          onUpdateIssue={handleChildIssueUpdate}
        />
      ) : null,
    [
      taskChatShellEnabled,
      streamlinedTaskDetailEnabled,
      issue,
      showRichSubIssuesSection,
      childIssues,
      childIssuesLoading,
      agents,
      projects,
      liveIssueIds,
      resolvedIssueDetailState,
      location.state,
      currentUserId,
      handleChildIssueUpdate,
    ],
  );

  const cancelIssueMonitor = useMutation({
    mutationKey: ["cancel-issue-monitor", issueId],
    mutationFn: async () => {
      const current = await issuesApi.get(issueId!);
      const { monitor: _monitor, ...policy } = current.executionPolicy ?? { mode: "normal" as const, commentRequired: true, stages: [] };
      return issuesApi.update(current.id, {
        expectedExecutionPolicy: current.executionPolicy ?? null,
        executionPolicy: {
          ...policy,
          mode: policy.mode ?? "normal",
          commentRequired: policy.commentRequired ?? true,
          stages: policy.stages ?? [],
        },
      });
    },
    onSuccess: () => {
      invalidateIssueDetail();
      invalidateIssueRunState();
      invalidateIssueCollections();
    },
  });

  const checkIssueMonitorNow = useMutation({
    mutationKey: ["check-issue-monitor-now", issueId],
    mutationFn: () => issuesApi.checkMonitorNow(issueId!),
    onSuccess: () => {
      invalidateIssueDetail();
      invalidateIssueRunState();
      invalidateIssueCollections();
      pushToast({
        title: "Monitor check queued",
        tone: "success",
      });
    },
    onError: (err) => {
      pushToast({
        title: "Monitor check failed",
        body:
          err instanceof Error
            ? err.message
            : "Unable to trigger the monitor right now",
        tone: "error",
      });
    },
  });

  const approvalDecision = useMutation({
    mutationFn: async ({
      approvalId,
      action,
    }: {
      approvalId: string;
      action: "approve" | "reject";
    }) => {
      if (action === "approve") {
        return approvalsApi.approve(approvalId);
      }
      return approvalsApi.reject(approvalId);
    },
    onMutate: ({ approvalId, action }) => {
      setPendingApprovalAction({ approvalId, action });
    },
    onSuccess: (_approval, variables) => {
      invalidateIssueDetail();
      queryClient.invalidateQueries({
        queryKey: queryKeys.issues.approvals(issueId!),
      });
      invalidateIssueCollections();
      queryClient.invalidateQueries({
        queryKey: queryKeys.approvals.detail(variables.approvalId),
      });
      if (resolvedCompanyId) {
        queryClient.invalidateQueries({
          queryKey: queryKeys.approvals.list(resolvedCompanyId),
        });
      }
      pushToast({
        title:
          variables.action === "approve"
            ? "Approval approved"
            : "Approval rejected",
        tone: "success",
      });
    },
    onError: (err, variables) => {
      pushToast({
        title:
          variables.action === "approve"
            ? "Approval failed"
            : "Rejection failed",
        body: err instanceof Error ? err.message : "Unable to update approval",
        tone: "error",
      });
    },
    onSettled: () => {
      setPendingApprovalAction(null);
    },
  });

  const addComment = useAccountBoundMutation({
    mutationFn: async ({ body, reopen, interrupt, attachmentIds, clientRequestId, runSettings }: {
      body: string; reopen?: boolean; interrupt?: boolean; attachmentIds?: string[]; clientRequestId?: string; runSettings?: ComposerRunSettings;
    }, { assertCurrentAccount }) => {
      if (issue?.conversationAgentId) clearLegacyChatMessageRequests(`${issue.companyId}:${currentUserId}:${issue.conversationAgentId}`);
      const writableIssueId = await resolveWritableIssueId();
      assertCurrentAccount();
      // Conversation messages use the ordered, idempotent comments endpoint.
      // Save the conversation's run preferences before admitting the next message.
      if (runSettings && issue?.conversationAgentId) {
        const updated = await issuesApi.update(writableIssueId, {
          assigneeAdapterOverrides: mergeComposerRunSettings(
            issue.assigneeAdapterOverrides,
            (conversation?.agent ?? agentMap.get(issue.conversationAgentId))?.adapterType,
            runSettings,
          ),
        });
        assertCurrentAccount();
        queryClient.setQueryData(queryKeys.issues.detail(writableIssueId), updated);
      }
      return issuesApi.addComment(writableIssueId, body, reopen, interrupt, attachmentIds, clientRequestId ?? crypto.randomUUID());
    },
    onMutate: async ({ body, reopen, interrupt }) => {
      // Start cache cancellation immediately but do not put it in front of the
      // optimistic echo. The new-runner startup placeholder must paint in the
      // same frame as send, even when an in-flight comments query is slow to
      // cancel.
      const cancelComments = queryClient.cancelQueries({
        queryKey: queryKeys.issues.comments(issueId!),
      });
      const cancelIssue = queryClient.cancelQueries({
        queryKey: queryKeys.issues.detail(issueId!),
      });

      const previousIssue = queryClient.getQueryData<Issue>(
        queryKeys.issues.detail(issueId!),
      );
      const queuedComment = !interrupt
        ? readIssueRunStateFromCache(queryClient, issueId!, issue)
            .interruptibleIssueRun
        : null;
      const optimisticComment = issue
        ? createOptimisticIssueComment({
            companyId: issue.companyId,
            issueId: issue.id,
            body,
            authorUserId: currentUserId,
            clientStatus: queuedComment ? "queued" : "pending",
            queueTargetRunId: queuedComment?.id ?? null,
          })
        : null;

      if (optimisticComment) {
        setOptimisticComments((current) => [...current, optimisticComment]);
      }
      if (previousIssue) {
        queryClient.setQueryData(
          queryKeys.issues.detail(issueId!),
          applyOptimisticIssueCommentUpdate(previousIssue, { reopen }),
        );
      }

      await Promise.all([cancelComments, cancelIssue]);

      return {
        optimisticCommentId: optimisticComment?.clientId ?? null,
        queuedCommentTargetRunId: queuedComment?.id ?? null,
        previousIssue,
      };
    },
    onSuccess: async (comment, _variables, context) => {
      if (
        context?.optimisticCommentId &&
        cancelledQueuedOptimisticCommentIdsRef.current.has(
          context.optimisticCommentId,
        )
      ) {
        cancelledQueuedOptimisticCommentIdsRef.current.delete(
          context.optimisticCommentId,
        );
        setOptimisticComments((current) =>
          current.filter(
            (entry) => entry.clientId !== context.optimisticCommentId,
          ),
        );
        try {
          await issuesApi.cancelComment(comment.issueId, comment.id);
          await removeCommentFromCache(comment.id);
          invalidateIssueDetail();
          invalidateIssueThreadLazily();
          invalidateIssueCollections();
          return;
        } catch (err) {
          pushToast({
            title: "Cancel failed",
            body:
              err instanceof Error
                ? err.message
                : "Unable to cancel the queued comment",
            tone: "error",
          });
        }
      }
      if (context?.queuedCommentTargetRunId) {
        setLocallyQueuedCommentRunIds((current) => {
          const next = new Map(current);
          next.set(comment.id, context.queuedCommentTargetRunId!);
          return next;
        });
        void queryClient.invalidateQueries({
          queryKey: queryKeys.issues.queuedComments(issueId ?? comment.issueId),
        });
      }
      if (context?.optimisticCommentId) {
        commentRenderKeys.current.set(comment.id, context.optimisticCommentId);
      }
      if (paginatedConversation) retainComment(comment);
      queryClient.setQueryData<InfiniteData<IssueComment[], string | null>>(
        queryKeys.issues.comments(issueId ?? comment.issueId),
        (current) =>
          current
            ? {
                ...current,
                pages: upsertIssueCommentInPages(current.pages, comment),
              }
            : {
                pageParams: [null],
                pages: upsertIssueCommentInPages(undefined, comment),
              },
      );
      // A locally seeded page is not a complete history page. Expansion must
      // fetch the real first page even within the normal cache freshness window.
      if (!historyExpanded) {
        await queryClient.invalidateQueries({ queryKey: queryKeys.issues.comments(issueId ?? comment.issueId), exact: true, refetchType: "none" });
      }
      if (context?.optimisticCommentId) {
        setOptimisticComments((current) =>
          current.filter(
            (entry) => entry.clientId !== context.optimisticCommentId,
          ),
        );
      }
      if (streamlinedUiEnabled && issue && sessionResolved) {
        recordRecentTask(
          issue,
          currentUserId,
          new Date(comment.createdAt).getTime(),
        );
      }
    },
    onError: (err, _variables, context) => {
      if (context?.optimisticCommentId) {
        setOptimisticComments((current) =>
          current.filter(
            (entry) => entry.clientId !== context.optimisticCommentId,
          ),
        );
      }
      if (context?.previousIssue) {
        queryClient.setQueryData(
          queryKeys.issues.detail(issueId!),
          context.previousIssue,
        );
      }
      // A comment that is not known to be saved stays in the composer and
      // resends with the same request ID; its notice replaces this toast.
      if (classifySendFailure(err) === "pending") return;
      const { title, body } = describeError(err, { action: "post the comment" });
      pushToast({ title, body, tone: "error" });
    },
    onFinished: (_variables, context) => {
      if (context?.optimisticCommentId) setOptimisticComments(current =>
        current.filter(entry => entry.clientId !== context.optimisticCommentId));
    },
    onSettled: (result, _error, variables) => {
      if (result && !issueId) void queryClient.invalidateQueries({ queryKey: queryKeys.issues.comments(result.issueId) });
      if (_error) void queryClient.invalidateQueries({ queryKey: ["issues", "tree-control-state"] });
      invalidateIssueThreadLazily();
      // Binding happens when the comment saves, after the upload's earlier
      // refetch. Refresh even after an unknown response: the write may exist.
      if (variables.attachmentIds?.length) {
        for (const ref of issueCacheRefs) {
          void queryClient.invalidateQueries({
            queryKey: queryKeys.issues.attachments(ref),
          });
        }
      }
      if (variables.interrupt) {
        invalidateIssueRunState();
      }
      if (variables.reopen) {
        invalidateIssueCollections();
      }
    },
  });
  // Resolutions may resend across an outage: the server refuses a second
  // resolution, and the API treats that refusal of our own earlier answer as
  // success.
  const acceptInteraction = useAccountBoundMutation({
    meta: { replay: "idempotent" },
    mutationFn: ({
      interaction,
      selectedClientKeys,
      selectedOptionIds,
      rememberAction,
    }: {
      interaction: ActionableIssueThreadInteraction;
      selectedClientKeys?: string[];
      selectedOptionIds?: string[];
      rememberAction?: boolean;
    }) =>
      issuesApi.acceptInteraction(issueId!, interaction.id, {
        selectedClientKeys,
        selectedOptionIds,
        rememberAction,
      }),
    onSuccess: (interaction) => {
      upsertInteractionInCache(interaction);
      if (
        interaction.kind === "suggest_tasks" &&
        resolvedCompanyId &&
        issue?.id
      ) {
        queryClient.invalidateQueries({
          queryKey: queryKeys.issues.listByParent(resolvedCompanyId, issue.id),
        });
      }
      invalidateIssueDetail();
      invalidateIssueCollections();
      const createdCount =
        interaction.kind === "suggest_tasks"
          ? (interaction.result?.createdTasks?.length ?? 0)
          : 0;
      const skippedCount =
        interaction.kind === "suggest_tasks"
          ? (interaction.result?.skippedClientKeys?.length ?? 0)
          : 0;
      pushToast({
        title:
          interaction.kind === "request_confirmation"
            ? "Request confirmed"
            : interaction.kind === "request_checkbox_confirmation"
              ? "Selection confirmed"
              : skippedCount > 0
                ? `Accepted ${createdCount} draft${createdCount === 1 ? "" : "s"} and skipped ${skippedCount}`
                : "Suggested tasks accepted",
        tone: "success",
      });
    },
    onError: (err) => {
      pushToast({
        title: "Accept failed",
        body: interactionResolutionErrorMessage(err),
        tone: "error",
      });
    },
  });
  const rejectInteraction = useAccountBoundMutation({
    meta: { replay: "idempotent" },
    mutationFn: ({
      interaction,
      reason,
    }: {
      interaction: ActionableIssueThreadInteraction;
      reason?: string;
    }) => issuesApi.rejectInteraction(issueId!, interaction.id, reason),
    onSuccess: (interaction) => {
      upsertInteractionInCache(interaction);
      invalidateIssueDetail();
      invalidateIssueCollections();
      pushToast({
        title:
          interaction.kind === "request_confirmation"
            ? buildIssueThreadInteractionSummary(interaction)
            : "Suggestion rejected",
        tone: "success",
      });
    },
    onError: (err) => {
      pushToast({
        title: "Reject failed",
        body: interactionResolutionErrorMessage(err),
        tone: "error",
      });
    },
  });
  const answerInteraction = useAccountBoundMutation({
    meta: { replay: "idempotent" },
    mutationFn: ({
      interaction,
      answers,
    }: {
      interaction: IssueThreadInteraction;
      answers: AskUserQuestionsAnswer[];
    }) => issuesApi.respondToInteraction(issueId!, interaction.id, { answers }),
    onSuccess: (interaction) => {
      upsertInteractionInCache(interaction);
      invalidateIssueDetail();
      invalidateIssueCollections();
      pushToast({
        title: "Answers submitted",
        tone: "success",
      });
    },
    onError: (err) => {
      pushToast({
        title: "Submit failed",
        body: interactionResolutionErrorMessage(err),
        tone: "error",
      });
    },
  });

  const submitInteractionVerdicts = useMutation({
    mutationFn: ({
      interaction,
      verdicts,
    }: {
      interaction: RequestItemVerdictsInteraction;
      verdicts: {
        id: string;
        verdict: RequestItemVerdictValue;
        reason?: string;
      }[];
    }) =>
      issuesApi.submitInteractionVerdicts(issueId!, interaction.id, verdicts),
    onSuccess: (interaction, variables) => {
      upsertInteractionInCache(interaction);
      invalidateIssueDetail();
      invalidateIssueCollections();
      const applied = variables.verdicts.length;
      const complete =
        interaction.kind === "request_item_verdicts"
          ? (interaction.result?.complete ?? false)
          : false;
      pushToast({
        title: complete
          ? "All verdicts applied"
          : `Applied ${applied} decision${applied === 1 ? "" : "s"}`,
        tone: "success",
      });
    },
    onError: (err) => {
      pushToast({
        title: "Apply failed",
        body:
          err instanceof Error ? err.message : "Unable to apply the verdicts",
        tone: "error",
      });
    },
  });

  const cancelInteraction = useMutation({
    mutationFn: ({
      interaction,
    }: {
      interaction: AskUserQuestionsInteraction;
    }) => issuesApi.cancelInteraction(issueId!, interaction.id),
    onSuccess: (interaction) => {
      upsertInteractionInCache(interaction);
      invalidateIssueDetail();
      invalidateIssueCollections();
      pushToast({
        title: "Question cancelled",
        tone: "success",
      });
    },
    onError: (err) => {
      pushToast({
        title: "Cancel failed",
        body:
          err instanceof Error ? err.message : "Unable to cancel the question",
        tone: "error",
      });
    },
  });

  const dismissInteraction = useMutation({
    mutationFn: (interaction: IssueThreadInteraction) => issuesApi.dismissInteraction(issueId!, interaction.id),
    onSuccess: (interaction) => {
      upsertInteractionInCache(interaction);
      invalidateIssueDetail();
      invalidateIssueCollections();
    },
  });

  const skipInteraction = useMutation({
    mutationFn: ({ interaction }: { interaction: IssueThreadInteraction }) =>
      issuesApi.skipInteraction(issueId!, interaction.id),
    onSuccess: (interaction) => {
      upsertInteractionInCache(interaction);
      invalidateIssueDetail();
      invalidateIssueCollections();
    },
    onError: (err) => {
      pushToast({
        title: "Skip failed",
        body:
          err instanceof Error ? err.message : "Unable to skip this request",
        tone: "error",
      });
    },
  });

  const addCommentAndReassign = useMutation({
    mutationFn: ({
      body,
      reopen,
      interrupt,
      reassignment,
      attachmentIds,
      clientRequestId,
      runSettings,
    }: {
      body: string;
      reopen?: boolean;
      interrupt?: boolean;
      reassignment?: CommentReassignment;
      attachmentIds?: string[];
      clientRequestId?: string;
      runSettings?: ComposerRunSettings;
    }) =>
      issuesApi.update(issueId!, {
        comment: body,
        commentClientRequestId: clientRequestId,
        ...(attachmentIds?.length ? { attachmentIds } : {}),
        ...(reassignment ? {
          assigneeAgentId: reassignment.assigneeAgentId,
          assigneeUserId: reassignment.assigneeUserId,
        } : {}),
        ...(runSettings || reassignment ? {
          assigneeAdapterOverrides: runSettings
            ? mergeComposerRunSettings(
                issue?.assigneeAdapterOverrides,
                agentMap.get(reassignment?.assigneeAgentId ?? issue?.assigneeAgentId ?? "")?.adapterType,
                runSettings,
                Boolean(reassignment),
              )
            : null,
        } : {}),
        ...(reopen ? { status: "todo" } : {}),
        ...(interrupt ? { interrupt } : {}),
      }),
    onMutate: async ({ body, reopen, reassignment, interrupt }) => {
      // Cache cancellation can wait on an active request for several seconds.
      // Start it now, but paint the optimistic echo before awaiting it so a
      // reassignment never clears the composer into an empty thread.
      const cancelComments = queryClient.cancelQueries({
        queryKey: queryKeys.issues.comments(issueId!),
      });
      const cancelIssue = queryClient.cancelQueries({
        queryKey: queryKeys.issues.detail(issueId!),
      });

      const previousIssue = queryClient.getQueryData<Issue>(
        queryKeys.issues.detail(issueId!),
      );
      const queuedComment = !interrupt
        ? readIssueRunStateFromCache(queryClient, issueId!, issue)
            .interruptibleIssueRun
        : null;
      const optimisticComment = issue
        ? createOptimisticIssueComment({
            companyId: issue.companyId,
            issueId: issue.id,
            body,
            authorUserId: currentUserId,
            clientStatus: queuedComment ? "queued" : "pending",
            queueTargetRunId: queuedComment?.id ?? null,
          })
        : null;

      if (optimisticComment) {
        setOptimisticComments((current) => [...current, optimisticComment]);
      }
      if (previousIssue) {
        queryClient.setQueryData(
          queryKeys.issues.detail(issueId!),
          applyOptimisticIssueCommentUpdate(previousIssue, {
            reopen,
            reassignment,
          }),
        );
      }

      await Promise.all([cancelComments, cancelIssue]);

      return {
        optimisticCommentId: optimisticComment?.clientId ?? null,
        queuedCommentTargetRunId: queuedComment?.id ?? null,
        previousIssue,
      };
    },
    onSuccess: async (result, _variables, context) => {
      const { comment, ...nextIssue } = result;
      queryClient.setQueryData(queryKeys.issues.detail(issueId!), nextIssue);
      if (
        comment &&
        context?.optimisticCommentId &&
        cancelledQueuedOptimisticCommentIdsRef.current.has(
          context.optimisticCommentId,
        )
      ) {
        cancelledQueuedOptimisticCommentIdsRef.current.delete(
          context.optimisticCommentId,
        );
        setOptimisticComments((current) =>
          current.filter(
            (entry) => entry.clientId !== context.optimisticCommentId,
          ),
        );
        try {
          await issuesApi.cancelComment(issueId!, comment.id);
          await removeCommentFromCache(comment.id);
          invalidateIssueDetail();
          invalidateIssueThreadLazily();
          invalidateIssueCollections();
          return;
        } catch (err) {
          pushToast({
            title: "Cancel failed",
            body:
              err instanceof Error
                ? err.message
                : "Unable to cancel the queued comment",
            tone: "error",
          });
        }
      }
      if (comment && context?.queuedCommentTargetRunId) {
        setLocallyQueuedCommentRunIds((current) => {
          const next = new Map(current);
          next.set(comment.id, context.queuedCommentTargetRunId!);
          return next;
        });
        void queryClient.invalidateQueries({
          queryKey: queryKeys.issues.queuedComments(issueId!),
        });
      }
      if (comment) {
        if (paginatedConversation) retainComment(comment);
        if (context?.optimisticCommentId)
          commentRenderKeys.current.set(
            comment.id,
            context.optimisticCommentId,
          );
        queryClient.setQueryData<InfiniteData<IssueComment[], string | null>>(
          queryKeys.issues.comments(issueId!),
          (current) =>
            current
              ? {
                  ...current,
                  pages: upsertIssueCommentInPages(current.pages, comment),
                }
              : {
                  pageParams: [null],
                  pages: upsertIssueCommentInPages(undefined, comment),
                },
        );
        if (!historyExpanded) {
          await queryClient.invalidateQueries({ queryKey: queryKeys.issues.comments(issueId!), exact: true, refetchType: "none" });
        }
      }
      if (context?.optimisticCommentId) {
        setOptimisticComments((current) =>
          current.filter(
            (entry) => entry.clientId !== context.optimisticCommentId,
          ),
        );
      }
    },
    onError: (err, _variables, context) => {
      if (context?.optimisticCommentId) {
        setOptimisticComments((current) =>
          current.filter(
            (entry) => entry.clientId !== context.optimisticCommentId,
          ),
        );
      }
      if (context?.previousIssue) {
        queryClient.setQueryData(
          queryKeys.issues.detail(issueId!),
          context.previousIssue,
        );
      }
      // A comment that is not known to be saved stays in the composer and
      // resends with the same request ID; its notice replaces this toast.
      if (classifySendFailure(err) === "pending") return;
      const { title, body } = describeError(err, { action: "post the comment" });
      pushToast({ title, body, tone: "error" });
    },
    onSettled: (_result, _error, variables) => {
      if (_error) void queryClient.invalidateQueries({ queryKey: ["issues", "tree-control-state"] });
      invalidateIssueThreadLazily();
      if (variables.attachmentIds?.length) {
        for (const ref of issueCacheRefs) {
          void queryClient.invalidateQueries({
            queryKey: queryKeys.issues.attachments(ref),
          });
        }
      }
      if (variables.interrupt) {
        invalidateIssueRunState();
      }
      invalidateIssueCollections();
    },
  });

  const interruptQueuedComment = useMutation({
    mutationFn: (runId: string | null) => issuesApi.interruptLatestQueuedComments(issueId!, runId),
    onSuccess: () => {
      invalidateIssueDetail();
      invalidateIssueRunState();
    },
    onError: () => {
      invalidateIssueDetail();
      invalidateIssueRunState();
    },
  });

  const cancelQueuedComment = useMutation({
    mutationFn: async ({ commentId }: { commentId: string }) =>
      issuesApi.cancelComment(issueId!, commentId),
    onSuccess: async (comment) => {
      setLocallyQueuedCommentRunIds((current) => {
        if (!current.has(comment.id)) return current;
        const next = new Map(current);
        next.delete(comment.id);
        return next;
      });
      await removeCommentFromCache(comment.id);
      restoreQueuedCommentDraft(comment.body);
      invalidateIssueDetail();
      invalidateIssueThreadLazily();
      invalidateIssueCollections();
      pushToast({
        title: "Queued comment canceled",
        body: "The queued message was restored to the composer.",
        tone: "success",
      });
    },
    onError: (err) => {
      pushToast({
        title: "Cancel failed",
        body:
          err instanceof Error
            ? err.message
            : "Unable to cancel the queued comment",
        tone: "error",
      });
    },
  });

  const deleteComment = useMutation({
    mutationFn: async ({ commentId }: { commentId: string }) =>
      issuesApi.deleteComment(issueId!, commentId),
    onSuccess: async (comment) => {
      await upsertCommentInCache(comment);
      clearCommentHashIfCurrent(comment.id);
      invalidateIssueDetail();
      invalidateIssueThreadLazily();
      invalidateIssueCollections();
      invalidateIssueDocumentAnnotationState();
      pushToast({
        title: "Comment deleted",
        body: "The thread now shows a deleted-comment marker.",
        tone: "success",
      });
    },
    onError: (err) => {
      pushToast({
        title: "Delete failed",
        body:
          err instanceof Error ? err.message : "Unable to delete the comment",
        tone: "error",
      });
    },
  });

  const handleCancelQueuedComment = useCallback(
    (commentId: string) => {
      if (commentId.startsWith("optimistic-")) {
        cancelledQueuedOptimisticCommentIdsRef.current.add(commentId);
        let cancelledCommentBody: string | null = null;
        setOptimisticComments((current) => {
          const next = takeOptimisticIssueComment(current, commentId);
          cancelledCommentBody = next.comment?.body ?? null;
          return next.comments;
        });
        if (cancelledCommentBody) {
          restoreQueuedCommentDraft(cancelledCommentBody);
          pushToast({
            title: "Queued comment canceled",
            body: "The queued message was restored to the composer.",
            tone: "success",
          });
        }
        return;
      }

      void cancelQueuedComment.mutateAsync({ commentId });
    },
    [cancelQueuedComment, restoreQueuedCommentDraft, pushToast],
  );

  const feedbackVoteMutation = useMutation({
    mutationFn: (variables: {
      targetType: "issue_comment" | "issue_document_revision";
      targetId: string;
      vote: "up" | "down";
      reason?: string;
      allowSharing?: boolean;
      sharingPreferenceAtSubmit: "allowed" | "not_allowed" | "prompt";
    }) =>
      issuesApi.upsertFeedbackVote(issueId!, {
        targetType: variables.targetType,
        targetId: variables.targetId,
        vote: variables.vote,
        ...(variables.reason ? { reason: variables.reason } : {}),
        ...(variables.allowSharing ? { allowSharing: true } : {}),
      }),
    onMutate: async (variables) => {
      await queryClient.cancelQueries({
        queryKey: queryKeys.issues.feedbackVotes(issueId!),
      });
      const previousVotes = queryClient.getQueryData<FeedbackVote[]>(
        queryKeys.issues.feedbackVotes(issueId!),
      );
      queryClient.setQueryData<FeedbackVote[]>(
        queryKeys.issues.feedbackVotes(issueId!),
        mergeOptimisticFeedbackVote(
          previousVotes,
          {
            issueId: issueId!,
            targetType: variables.targetType,
            targetId: variables.targetId,
            vote: variables.vote,
            reason: variables.reason,
          },
          currentUserId,
        ),
      );
      return { previousVotes };
    },
    onSuccess: (_savedVote, variables) => {
      queryClient.invalidateQueries({
        queryKey: queryKeys.issues.feedbackVotes(issueId!),
      });
      queryClient.invalidateQueries({ queryKey: queryKeys.companies.all });
      queryClient.invalidateQueries({
        queryKey: queryKeys.instance.generalSettings,
      });
      pushToast({
        title:
          variables.sharingPreferenceAtSubmit === "prompt"
            ? variables.allowSharing
              ? "Feedback saved. Future votes will share"
              : "Feedback saved. Future votes will stay local"
            : variables.allowSharing
              ? "Feedback saved and sharing enabled"
              : "Feedback saved",
        tone: "success",
      });
    },
    onError: (err, _variables, context) => {
      if (context?.previousVotes) {
        queryClient.setQueryData(
          queryKeys.issues.feedbackVotes(issueId!),
          context.previousVotes,
        );
      }
      pushToast({
        title: "Failed to save feedback",
        body: err instanceof Error ? err.message : "Unknown error",
        tone: "error",
      });
    },
  });

  const uploadAttachment = useMutation({
    mutationFn: async (file: File) => {
      if (conversation) {
        return issuesApi.uploadAttachment(conversation.agent.companyId, await resolveWritableIssueId(), file);
      }
      if (!loadedIssue)
        throw new Error("Task details are still loading. Please try again.");
      return issuesApi.uploadAttachment(
        loadedIssue.companyId,
        loadedIssue.id,
        file,
      );
    },
    onSuccess: (result) => {
      setAttachmentError(null);
      queryClient.invalidateQueries({
        queryKey: queryKeys.issues.attachments(issueId ?? result.issueId),
      });
      invalidateIssueDetail();
      if (!issueId) void queryClient.invalidateQueries({ queryKey: queryKeys.issues.detail(result.issueId) });
    },
    onError: (err) => {
      setAttachmentError(err instanceof Error ? err.message : "Upload failed");
    },
  });

  const importMarkdownDocument = useMutation({
    mutationFn: async (file: File) => {
      const baseName = fileBaseName(file.name);
      const key = slugifyDocumentKey(baseName);
      const existing =
        (issue?.documentSummaries ?? []).find((doc) => doc.key === key) ?? null;
      const body = await file.text();
      const inferredTitle = titleizeFilename(baseName);
      const nextTitle = existing?.title ?? inferredTitle ?? null;
      return issuesApi.upsertDocument(await resolveWritableIssueId(), key, {
        title: key === "plan" ? null : nextTitle,
        format: "markdown",
        body,
        baseRevisionId: existing?.latestRevisionId ?? null,
      });
    },
    onSuccess: (result) => {
      setAttachmentError(null);
      invalidateIssueDetail();
      if (!issueId) void queryClient.invalidateQueries({ queryKey: queryKeys.issues.detail(result.issueId) });
      queryClient.invalidateQueries({
        queryKey: queryKeys.issues.documents(issueId ?? result.issueId),
      });
    },
    onError: (err) => {
      setAttachmentError(
        err instanceof Error ? err.message : "Document import failed",
      );
    },
  });

  const deleteAttachment = useMutation({
    mutationFn: (attachmentId: string) =>
      issuesApi.deleteAttachment(attachmentId),
    onSuccess: () => {
      setAttachmentError(null);
      queryClient.invalidateQueries({
        queryKey: queryKeys.issues.attachments(issueId!),
      });
      invalidateIssueDetail();
    },
    onError: (err) => {
      setAttachmentError(err instanceof Error ? err.message : "Delete failed");
    },
  });

  const archiveFromInbox = useMutation({
    mutationFn: (id: string) => issuesApi.archiveFromInbox(id),
    onMutate: async (id) => {
      if (!selectedCompanyId)
        return { previousData: [] as InboxIssueCacheSnapshot };
      beginLocalInboxArchive(selectedCompanyId, id);
      await cancelInboxIssueQueries(queryClient, selectedCompanyId);
      const previousData = snapshotInboxIssueCaches(
        queryClient,
        selectedCompanyId,
      );
      removeIssueFromInboxCaches(queryClient, selectedCompanyId, id);
      return { companyId: selectedCompanyId, previousData };
    },
    onSuccess: (_data, id, context) => {
      if (selectedCompanyId) {
        removeIssueFromInboxCaches(queryClient, selectedCompanyId, id);
      }
      invalidateIssueCollections();
      navigate(
        sourceBreadcrumb.href.startsWith("/inbox")
          ? sourceBreadcrumb.href
          : "/inbox",
        { replace: true },
      );
      pushToast({
        title: "Task archived from inbox",
        tone: "success",
        action: {
          label: "Undo",
          onClick: () => {
            void undoInboxArchive(
              id,
              context?.companyId,
              context?.previousData ?? [],
            );
          },
        },
      });
    },
    onError: (err, id, context) => {
      if (context?.companyId) clearLocalInboxArchive(context.companyId, id);
      if (context?.previousData) {
        restoreIssueToInboxCaches(queryClient, context.previousData, id);
      }
      pushToast({
        title: "Archive failed",
        body:
          err instanceof Error
            ? err.message
            : "Unable to archive this task from the inbox",
        tone: "error",
      });
    },
    onSettled: async (_data, error, id, context) => {
      if (!context?.companyId) return;
      if (!error) boundLocalInboxArchive(context.companyId, id);
      await invalidateInboxIssueQueries(queryClient, context.companyId);
      if (!error) {
        const presence = getIssuePresenceInActiveInboxCaches(
          queryClient,
          context.companyId,
          id,
        );
        if (presence !== "unknown")
          confirmLocalInboxArchive(context.companyId, id);
      }
    },
  });

  const conversationAgent = conversation?.agent ?? agents?.find(agent => agent.id === issue?.conversationAgentId);
  useEffect(() => {
    if (conversationAgent) {
      setBreadcrumbs([{
        label: conversationAgent.name,
        leading: <AgentAvatar agent={conversationAgent} size={24} />,
        leadingKey: `agent:${conversationAgent.id}:${JSON.stringify(conversationAgent.appearance)}`,
        trailing: coordinatorWorkspaceEnabled ? <CoordinatorAgentSwitcher agent={conversationAgent} /> : <Button variant="ghost" size="icon-xs" asChild aria-label={`Configure ${conversationAgent.name}`}><Link to={agentDetailHref(conversationAgent.id, "runtime")}><ChatSettings /></Link></Button>,
        trailingKey: `${coordinatorWorkspaceEnabled ? "switch" : "configure"}:${conversationAgent.id}`,
      }]);
      return;
    }
    setBreadcrumbs([
      sourceBreadcrumb,
      {
        // The status glyph (leading) already conveys in-progress/live state;
        // no redundant 🔵 emoji prefix on the title.
        label: breadcrumbTitle,
        identifier: breadcrumbIdentifier,
        leading: breadcrumbStatusLeading,
        leadingKey: breadcrumbStatusKey,
      },
    ]);
  }, [
    conversationAgent,
    coordinatorWorkspaceEnabled,
    breadcrumbTitle,
    breadcrumbIdentifier,
    hasLiveRuns,
    setBreadcrumbs,
    sourceBreadcrumb.href,
    sourceBreadcrumb.label,
    breadcrumbStatusLeading,
    breadcrumbStatusKey,
  ]);

  useEffect(() => {
    if (!streamlinedTaskDetailEnabled || !taskChatShellEnabled || !issue?.id) {
      setBreadcrumbPanelControl(null);
      return;
    }

    setBreadcrumbPanelControl({
      open: panelVisible && !suppressPanelUntilPlan,
      onToggle: toggleTaskSidePanel,
    });

    return () => setBreadcrumbPanelControl(null);
  }, [
    issue?.id,
    panelVisible,
    setBreadcrumbPanelControl,
    streamlinedTaskDetailEnabled,
    suppressPanelUntilPlan,
    taskChatShellEnabled,
    toggleTaskSidePanel,
  ]);

  useEffect(() => {
    const showTaskPanelLauncher =
      taskChatShellEnabled &&
      !streamlinedTaskDetailEnabled &&
      !isMobile &&
      Boolean(issue?.id) &&
      (!panelVisible || suppressPanelUntilPlan);

    setBreadcrumbToolbar(
      showTaskPanelLauncher ? (
        <TooltipProvider>
          <SidePanelToggleButton
            open={false}
            onToggle={openTaskSidePanel}
            shortcut="]"
            className="shrink-0"
          />
        </TooltipProvider>
      ) : null,
    );

    return () => setBreadcrumbToolbar(null);
  }, [
    isMobile,
    issue?.id,
    openTaskSidePanel,
    panelVisible,
    setBreadcrumbToolbar,
    streamlinedTaskDetailEnabled,
    suppressPanelUntilPlan,
    taskChatShellEnabled,
  ]);

  const isFromInbox = resolvedIssueDetailState?.issueDetailSource === "inbox";

  // Scroll to top on forward navigation (PUSH/REPLACE) so issue doesn't
  // inherit the inbox/issues-list scroll position on mobile.
  useEffect(() => {
    const previousIssueId = lastScrollIssueIdRef.current;
    lastScrollIssueIdRef.current = issueId;
    if (
      !shouldScrollIssueDetailToTopOnNavigation({
        previousIssueId,
        nextIssueId: issueId,
        navigationType,
      })
    )
      return;
    window.scrollTo({ top: 0, left: 0, behavior: "auto" });
    const main = document.getElementById("main-content");
    if (main) main.scrollTop = 0;
  }, [issueId, navigationType]);

  // Resolve external UUID links and wrong-prefix task links from the loaded
  // task's company, not the organization that happened to be selected first.
  useEffect(() => {
    if (conversation || !loadedIssue) return;
    const nextState = resolvedIssueDetailState ?? location.state;
    const taskCompany = loadedIssueCompany;
    const canonicalRef = loadedIssue.identifier ?? loadedIssue.id;
    const companyMismatch =
      taskCompany && companyPrefix !== taskCompany.issuePrefix;
    const legacyQuery = hasLegacyIssueDetailQuery(location.search);
    if (issueId !== canonicalRef || companyMismatch || legacyQuery) {
      rememberIssueDetailLocationState(
        canonicalRef,
        nextState,
        location.search,
      );
      const taskPath = createIssueDetailPath(canonicalRef);
      navigate(
        {
          pathname: taskCompany
            ? `/${taskCompany.issuePrefix}${taskPath}`
            : taskPath,
          search: legacyQuery ? "" : location.search,
          hash: location.hash,
        },
        {
          replace: true,
          state: nextState,
        },
      );
    }
  }, [
    conversation,
    loadedIssue,
    loadedIssueCompany,
    companyPrefix,
    issueId,
    navigate,
    location.state,
    location.search,
    location.hash,
    resolvedIssueDetailState,
  ]);

  useEffect(() => {
    if (!issueId || !issue?.id) return;
    if (lastMarkedReadIssueIdRef.current === issue.id) return;
    lastMarkedReadIssueIdRef.current = issue.id;
    markIssueRead.mutate(issue.id);
  }, [issue?.id]); // eslint-disable-line react-hooks/exhaustive-deps

  const mediaGalleryItems = useMemo<GalleryMediaItem[]>(() => {
    const items: GalleryMediaItem[] = [];
    const seen = new Set<string>();

    const mark = (
      attachmentId: string | null | undefined,
      contentPath: string,
    ) => {
      if (attachmentId) seen.add(`attachment:${attachmentId}`);
      seen.add(`content:${contentPath}`);
    };

    const hasSeen = (
      attachmentId: string | null | undefined,
      contentPath: string,
    ) =>
      Boolean(attachmentId && seen.has(`attachment:${attachmentId}`)) ||
      seen.has(`content:${contentPath}`);

    for (const attachment of attachments ?? []) {
      if (!isImageAttachment(attachment) && !isVideoAttachment(attachment))
        continue;
      items.push(attachment);
      mark(attachment.id, attachment.contentPath);
    }

    for (const item of getIssueOutputs(workProducts).items) {
      const meta = item.metadata;
      if (!meta) continue;
      const isMedia =
        isImageLikeOutput(meta.contentType, meta.originalFilename ?? item.title) ||
        isVideoLikeOutput(meta.contentType, meta.originalFilename);
      if (!isMedia || hasSeen(meta.attachmentId, meta.contentPath)) continue;
      items.push({
        id: `work-product-${item.id}`,
        contentPath: meta.contentPath,
        openPath: meta.openPath,
        downloadPath: meta.downloadPath,
        contentType: meta.contentType,
        originalFilename: meta.originalFilename ?? item.title,
      });
      mark(meta.attachmentId, meta.contentPath);
    }

    return items;
  }, [attachments, workProducts]);

  const openIssueGallery = useCallback(
    (src: string) => {
      // Match content and preview URLs in either relative or absolute form.
      const absoluteUrl = (path: string) => {
        try {
          return new URL(path, window.location.origin).href;
        } catch {
          return path;
        }
      };
      const requestedUrl = absoluteUrl(src);
      let idx = mediaGalleryItems.findIndex(
        (a) =>
          absoluteUrl(a.contentPath) === requestedUrl ||
          (a.openPath && absoluteUrl(a.openPath) === requestedUrl),
      );
      if (idx < 0) {
        // Try matching by asset ID extracted from /api/assets/{assetId}/content URLs
        const assetMatch = src.match(/\/api\/assets\/([^/]+)\/content/);
        if (assetMatch) {
          idx = mediaGalleryItems.findIndex(
            (a) => "assetId" in a && a.assetId === assetMatch[1],
          );
        }
      }
      if (idx >= 0) {
        setGalleryIndex(idx);
        setGalleryOpen(true);
        return true;
      }
      return false;
    },
    [mediaGalleryItems],
  );

  const handleChatImageClick = useCallback(
    (src: string) => {
      if (!openIssueGallery(src)) window.open(src, "_blank");
    },
    [openIssueGallery],
  );

  useLayoutEffect(() => {
    if (!panelIssue || suppressPanelUntilPlan || (conversation && !conversation.issue) || (taskChatShellEnabled && isMobile)) {
      closePanel();
      return;
    }
    const sharedProps = {
      issue: panelIssue,
      childIssues: panelChildIssues,
      issueLinkState: streamlinedTaskDetailEnabled
        ? relationIssueLinkState
        : undefined,
      onAddSubIssue: openNewSubIssue,
      onUpdate: handleIssuePropertiesUpdate,
      hasActiveRun: resolvedHasActiveRun,
      externalObjects: externalObjectsState.isEnabled
        ? externalObjectsState.groups
        : undefined,
      externalObjectsLoading: externalObjectsState.isEnabled
        ? externalObjectsState.isLoading
        : undefined,
      externalObjectsError: externalObjectsState.isEnabled
        ? externalObjectsState.isError
        : undefined,
      onRetryExternalObjects: externalObjectsState.isEnabled
        ? externalObjectsState.refetch
        : undefined,
      onCheckMonitorNow: () => checkIssueMonitorNow.mutate(),
      checkingMonitorNow: checkIssueMonitorNow.isPending,
      documentDeepLink:
        documentDeepLink?.issueId === panelIssue.id ? documentDeepLink : null,
      onAttachmentOpened: handleAttachmentOpened,
      openAttachment: !isMobile && openAttachment?.issueId === panelIssue.id ? openAttachment : null,
      openSkillId: openSkill?.id ?? null,
      openSkillName: openSkill?.name ?? null,
      onSkillOpened: handleSkillOpened,
    };
    if (taskChatShellEnabled) {
      openPanel(
        <IssueGalleryContext.Provider value={openIssueGallery}>
          <TaskSidePanel
            pluginPanels={pluginPanels}
            pluginPanelsLoading={pluginPanelsLoading}
            openedPluginPanelKeys={openedPluginPanelKeys.current}
            dismissedPluginPanelKeys={dismissedPluginPanelKeys.current}
            openBrowserId={openBrowserId}
            onBrowserOpened={handleBrowserOpened}
            key={panelIssue.id}
            {...sharedProps}
            accountScope={taskPanelAccountScope}
            fileTabsEnabled={fileViewerEnabled}
            streamlinedTabs={streamlinedTaskDetailEnabled}
            showSubtasksTab={streamlinedTaskDetailEnabled}
            tasksTab={resolvedTasksTab}
            artifactsOpenRequestId={!isMobile && !artifactsOpenRequest?.handled && artifactsOpenRequest?.issueId === panelIssue.id
              ? artifactsOpenRequest.requestId : undefined}
            onArtifactsOpened={handleArtifactsOpened}
          />
        </IssueGalleryContext.Provider>,
        { contentMode: "full-bleed" },
      );
    } else {
      openPanel(
        <IssueGalleryContext.Provider value={openIssueGallery}>
          <IssueProperties {...sharedProps} />
        </IssueGalleryContext.Provider>,
      );
    }
    return () => closePanel();
  }, [
    pluginPanels,
    pluginPanelsLoading,
    taskPanelAccountScope,
    openBrowserId,
    handleBrowserOpened,
    closePanel,
    openIssueGallery,
    handleIssuePropertiesUpdate,
    issuePanelKey,
    openNewSubIssue,
    openPanel,
    openAttachment,
    handleAttachmentOpened,
    openSkill,
    handleSkillOpened,
    panelChildIssues,
    panelIssue,
    suppressPanelUntilPlan,
    relationIssueLinkState,
    streamlinedTaskDetailEnabled,
    resolvedHasActiveRun,
    checkIssueMonitorNow.isPending,
    checkIssueMonitorNow.mutate,
    externalObjectsState.isEnabled,
    externalObjectsState.groups,
    externalObjectsState.isLoading,
    externalObjectsState.isError,
    externalObjectsState.refetch,
    documentDeepLink,
    taskChatShellEnabled,
    currentUserId,
    coordinatorWorkspaceEnabled,
    fileViewerEnabled,
    resolvedTasksTab,
    artifactsOpenRequest,
    handleArtifactsOpened,
    isMobile,
  ]);

  const goToInboxShortcutArmedRef = useRef(false);
  const goToInboxShortcutTimeoutRef = useRef<number | null>(null);
  const canQuickArchiveFromInbox = !issue?.hiddenAt;

  useEffect(() => {
    if (!issue?.id || !canQuickArchiveFromInbox) return;
    const handleKeyDown = (event: KeyboardEvent) => {
      const action = resolveInboxQuickArchiveKeyAction({
        armed: canQuickArchiveFromInbox,
        defaultPrevented: event.defaultPrevented,
        key: event.key,
        metaKey: event.metaKey,
        ctrlKey: event.ctrlKey,
        altKey: event.altKey,
        target: event.target,
        hasOpenDialog: hasBlockingShortcutDialog(document),
      });

      if (action !== "archive") return;

      event.preventDefault();
      if (!archiveFromInbox.isPending) {
        archiveFromInbox.mutate(issue.id);
      }
    };

    document.addEventListener("keydown", handleKeyDown, true);
    return () => {
      document.removeEventListener("keydown", handleKeyDown, true);
    };
  }, [archiveFromInbox, canQuickArchiveFromInbox, issue?.id]);

  useEffect(() => {
    const clearArmTimeout = () => {
      if (goToInboxShortcutTimeoutRef.current !== null) {
        window.clearTimeout(goToInboxShortcutTimeoutRef.current);
        goToInboxShortcutTimeoutRef.current = null;
      }
    };

    const disarm = () => {
      goToInboxShortcutArmedRef.current = false;
      clearArmTimeout();
    };

    const arm = () => {
      goToInboxShortcutArmedRef.current = true;
      clearArmTimeout();
      goToInboxShortcutTimeoutRef.current = window.setTimeout(() => {
        goToInboxShortcutArmedRef.current = false;
        goToInboxShortcutTimeoutRef.current = null;
      }, 1200);
    };

    const handlePointerDown = () => {
      disarm();
    };

    const handleFocusIn = (event: FocusEvent) => {
      if (
        event.target instanceof HTMLElement &&
        event.target !== document.body
      ) {
        disarm();
      }
    };

    const handleKeyDown = (event: KeyboardEvent) => {
      const action = resolveIssueDetailGoKeyAction({
        armed: goToInboxShortcutArmedRef.current,
        defaultPrevented: event.defaultPrevented,
        key: event.key,
        metaKey: event.metaKey,
        ctrlKey: event.ctrlKey,
        altKey: event.altKey,
        target: event.target,
        hasOpenDialog: hasBlockingShortcutDialog(document),
      });

      if (action === "ignore") return;
      if (action === "arm") {
        arm();
        return;
      }

      disarm();
      if (action === "navigate_inbox") {
        event.preventDefault();
        event.stopPropagation();
        navigate(
          sourceBreadcrumb.href.startsWith("/inbox")
            ? sourceBreadcrumb.href
            : "/inbox",
        );
        return;
      }
      if (action === "focus_comment") {
        event.preventDefault();
        event.stopPropagation();
        setDetailTab("chat");
        setPendingCommentComposerFocusKey((current) => current + 1);
      }
      if (action === "open_file_viewer") {
        if (!fileViewerEnabled) return;
        event.preventDefault();
        event.stopPropagation();
        setFileViewerPromptOpen(true);
      }
    };

    document.addEventListener("pointerdown", handlePointerDown, true);
    document.addEventListener("focusin", handleFocusIn, true);
    document.addEventListener("keydown", handleKeyDown, true);
    return () => {
      disarm();
      document.removeEventListener("pointerdown", handlePointerDown, true);
      document.removeEventListener("focusin", handleFocusIn, true);
      document.removeEventListener("keydown", handleKeyDown, true);
    };
  }, [
    fileViewerEnabled,
    navigate,
    sourceBreadcrumb.href,
  ]);

  // One maximize request per issue + `viewer=full` hash: routing re-runs
  // whenever a callback dependency changes identity, and re-requesting then
  // would re-maximize a pane the user deliberately restored. The key carries
  // the issue param so navigating to another issue with an identical hash
  // still maximizes the destination pane.
  const lastMaximizeRequestKeyRef = useRef<string | null>(null);
  const routeIssueDocumentDeepLink = useCallback(
    (hash: string) => {
      const resolvedRoute = resolveIssueDocumentDeepLink(hash);
      // A handoff is a saved document too. Opening it must not switch the
      // conversation to full activity just because it has a legacy hash.
      const route = resolvedRoute?.kind === "continuation-summary" && taskChatShellEnabled
        ? { kind: "properties-pane" as const, tab: "document" as const, documentKey: "continuation-summary", maximize: false }
        : resolvedRoute;
      if (!route) return false;

      if (route.kind === "continuation-summary") {
        setDocumentDeepLink(null);
        setDetailTab("activity");
        setHandoffFocusSignal((current) => current + 1);
        return true;
      }

      // The classic interface owns document links in its center-column
      // Documents section. Do not open its tab-less properties panel.
      if (!taskInterfaceSettingsLoaded || !taskChatShellEnabled) return false;

      if (isMobile) {
        setMobilePropsOpen(true);
      } else {
        if (suppressPanelUntilPlan && issue?.id) {
          setPanelBeforePlanOverrideIssueId(issue.id);
        }
        setPanelVisible(true);
        // `viewer=full` (LOOA-2181): external links (Slack approval cards)
        // land with the pane maximized. Mobile uses the sheet, which is
        // already full-screen, so the request is desktop-only.
        if (route.maximize) {
          const requestKey = `${issueId ?? ""}::${hash}`;
          if (lastMaximizeRequestKeyRef.current !== requestKey) {
            lastMaximizeRequestKeyRef.current = requestKey;
            requestPanelMaximize();
          }
        }
      }
      const targetIssueId = issue?.id ?? issueId ?? "";
      setDocumentDeepLink((current) => ({
        issueId: targetIssueId,
        tab: route.tab,
        documentKey: route.documentKey,
        requestId:
          current?.issueId === targetIssueId ? current.requestId + 1 : 1,
      }));
      return true;
    },
    [
      taskInterfaceSettingsLoaded,
      isMobile,
      issue?.id,
      issueId,
      setPanelVisible,
      requestPanelMaximize,
      suppressPanelUntilPlan,
      taskChatShellEnabled,
    ],
  );

  useEffect(() => {
    if (!routeIssueDocumentDeepLink(location.hash)) {
      setDocumentDeepLink(null);
      // The deep link ended (hash cleared or issue changed): drop any
      // maximize request the panel never consumed so it cannot maximize a
      // later, unrelated panel, and re-arm for the next viewer=full hash.
      lastMaximizeRequestKeyRef.current = null;
      clearPanelMaximizeRequest();
    }
  }, [
    issueId,
    location.hash,
    routeIssueDocumentDeepLink,
    clearPanelMaximizeRequest,
  ]);

  // Leaving the issue page entirely also ends the deep link's lifetime.
  useEffect(
    () => () => {
      clearPanelMaximizeRequest();
    },
    [clearPanelMaximizeRequest],
  );

  // Keep first and repeated document clicks inside the mounted task and its
  // query cache. Native anchors reset thread scroll or reload alias URLs.
  useEffect(() => {
    const handleDocumentClick = (event: MouseEvent) => {
      if (
        event.defaultPrevented ||
        event.button !== 0 ||
        event.metaKey ||
        event.ctrlKey ||
        event.shiftKey ||
        event.altKey
      )
        return;
      const target = event.target;
      if (!(target instanceof Element)) return;
      const anchor = target.closest<HTMLAnchorElement>("a[href]");
      if (!anchor || anchor.hasAttribute("download") || (anchor.target && anchor.target !== "_self")) return;
      const rawHref = anchor.getAttribute("href");
      if (!rawHref) return;

      const currentUrl = new URL(`${location.pathname}${location.search}${location.hash}`, window.location.origin);
      const hash = sameIssueDocumentHash(rawHref, currentUrl, [issue?.id, issue?.identifier, issueId].filter((id): id is string => !!id));
      if (!hash) return;
      const route = resolveIssueDocumentDeepLink(hash);
      if (route?.kind === "properties-pane" && (!taskInterfaceSettingsLoaded || !taskChatShellEnabled)) return;
      event.preventDefault();
      // Let link handlers close any hovered task preview. Router links and
      // popover triggers honor defaultPrevented and skip their navigation.
      if (hash === location.hash) {
        routeIssueDocumentDeepLink(hash);
      } else {
        navigate(`${location.pathname}${location.search}${hash}`, {
          preventScrollReset: true,
          state: {
            ...(location.state && typeof location.state === "object" ? location.state : {}),
            taskDocumentScrollEntry: taskChatScrollEntry(location),
          },
        });
      }
    };

    document.addEventListener("click", handleDocumentClick, true);
    return () =>
      document.removeEventListener("click", handleDocumentClick, true);
  }, [
    issue?.id,
    issue?.identifier,
    issueId,
    navigate,
    location.hash,
    location.key,
    location.pathname,
    location.search,
    location.state,
    taskChatShellEnabled,
    taskInterfaceSettingsLoaded,
    routeIssueDocumentDeepLink,
  ]);

  // Scroll + briefly highlight work-product / direct-attachment anchors so the
  // company Artifacts page (PAP-10359) can deep-link to a specific artifact in
  // its issue context. Retries while the section data loads in.
  useEffect(() => {
    const match = location.hash.match(/^#(work-product|attachment)-(.+)$/);
    if (!match) return;
    const targetId = `${match[1]}-${decodeURIComponent(match[2]!)}`;
    let cancelled = false;
    let attempts = 0;
    let timer: ReturnType<typeof setTimeout> | undefined;
    const tryScroll = () => {
      if (cancelled) return;
      const element = document.getElementById(targetId);
      if (!element) {
        if (attempts < 30) {
          attempts += 1;
          timer = setTimeout(tryScroll, 100);
        }
        return;
      }
      element.scrollIntoView({ behavior: "smooth", block: "center" });
      element.classList.add("ring-2", "ring-primary/50", "transition-shadow");
      timer = setTimeout(
        () =>
          element.classList.remove(
            "ring-2",
            "ring-primary/50",
            "transition-shadow",
          ),
        3000,
      );
    };
    tryScroll();
    return () => {
      cancelled = true;
      if (timer) clearTimeout(timer);
    };
  }, [location.hash, workProducts, attachments]);

  useEffect(() => {
    if (pendingCommentComposerFocusKey === 0) return;
    if (detailTab !== "chat") return;
    commentComposerRef.current?.focus();
  }, [detailTab, pendingCommentComposerFocusKey]);

  useEffect(() => {
    if (!fileViewerEnabled) return;
    const handleOpenFileViewer = () => {
      setFileViewerPromptOpen(true);
    };
    window.addEventListener(
      "paperclip:open-file-viewer",
      handleOpenFileViewer as EventListener,
    );
    return () => {
      window.removeEventListener(
        "paperclip:open-file-viewer",
        handleOpenFileViewer as EventListener,
      );
    };
  }, [fileViewerEnabled]);

  const promotedOutputAttachmentIds = useMemo(
    () => getPromotedOutputAttachmentIds(workProducts),
    [workProducts],
  );
  const attachmentList = useMemo(
    () =>
      (attachments ?? []).filter(
        (attachment) => !promotedOutputAttachmentIds.has(attachment.id),
      ),
    [attachments, promotedOutputAttachmentIds],
  );
  const copyIssueToClipboard = async () => {
    if (!issue) return;
    const decodeEntities = (text: string) => {
      const el = document.createElement("textarea");
      el.innerHTML = text;
      return el.value;
    };
    const title = decodeEntities(issue.title);
    const body = decodeEntities(issue.description ?? "");
    const md = `# ${issue.identifier}: ${title}\n\n${body}`.trimEnd();
    try {
      await copyTextToClipboard(md);
      setCopied(true);
      pushToast({ title: "Copied to clipboard", tone: "success" });
      setTimeout(() => setCopied(false), 2000);
    } catch (error) {
      pushToast({
        title: "Copy failed",
        body:
          error instanceof Error
            ? error.message
            : "Unable to copy task markdown",
        tone: "error",
      });
    }
  };

  // Gmail-style mobile toolbar when viewing an issue from inbox.
  // Callbacks are stored in a ref so the effect deps stay stable and
  // don't trigger an infinite render loop (useMutation results and
  // non-memoized functions change identity every render).
  const inboxToolbarCallbacksRef = useRef({
    onArchive: () => {
      if (!archiveFromInbox.isPending && issue?.id)
        archiveFromInbox.mutate(issue.id);
    },
    onCopy: () => copyIssueToClipboard(),
    onProperties: () => setMobilePropsOpen(true),
    onHide: () => {
      updateIssue.mutate(
        { hiddenAt: new Date().toISOString() },
        { onSuccess: () => navigate("/issues/all") },
      );
    },
  });
  inboxToolbarCallbacksRef.current = {
    onArchive: () => {
      if (!archiveFromInbox.isPending && issue?.id)
        archiveFromInbox.mutate(issue.id);
    },
    onCopy: () => copyIssueToClipboard(),
    onProperties: () => setMobilePropsOpen(true),
    onHide: () => {
      updateIssue.mutate(
        { hiddenAt: new Date().toISOString() },
        { onSuccess: () => navigate("/issues/all") },
      );
    },
  };

  const backHref = sourceBreadcrumb.href ?? "/inbox";
  const showInboxToolbar = isMobile && isFromInbox;
  const archivePending = archiveFromInbox.isPending;
  const issueHidden = !!issue?.hiddenAt;
  const canArchiveFromInbox = isFromInbox && !!issue?.id && !issueHidden;

  useEffect(() => {
    if (!showInboxToolbar) {
      setMobileToolbar(null);
      return;
    }

    setMobileToolbar(
      <InboxMobileToolbar
        backHref={backHref}
        preferHistoryBack={streamlinedUiEnabled ? preferInboxHistoryBack : true}
        issueId={issue?.id}
        issueHidden={issueHidden}
        archivePending={archivePending}
        onArchive={() => inboxToolbarCallbacksRef.current.onArchive()}
        onCopy={() => inboxToolbarCallbacksRef.current.onCopy()}
        onProperties={() => inboxToolbarCallbacksRef.current.onProperties()}
        onHide={() => inboxToolbarCallbacksRef.current.onHide()}
      />,
    );

    return () => setMobileToolbar(null);
  }, [
    showInboxToolbar,
    backHref,
    preferInboxHistoryBack,
    streamlinedUiEnabled,
    issue?.id,
    issueHidden,
    archivePending,
    setMobileToolbar,
  ]);

  const attachmentsInitialLoading =
    attachmentsLoading && attachments === undefined;
  const loadOlderComments = useCallback(() => paginatedConversation
    ? earlierChatComments.load() : fetchOlderComments(), [paginatedConversation, earlierChatComments.load, fetchOlderComments]);
  const refetchLatestComments = useCallback(async () => {
    if (paginatedConversation) {
      await recentComments.refetch();
      return;
    }
    // Refetch page 0 first so comments that arrived after initial load are
    // visible, then load every remaining older page. The chat thread is
    // paginated and virtualized, so "latest" must be resolved against the
    // complete comment set rather than the current loaded window.
    const refreshed = await refetchComments();
    const loaded = await loadRemainingIssueCommentPages<IssueComment>({
      pages: refreshed.data?.pages,
      pageParams: refreshed.data?.pageParams as
        Array<string | null> | undefined,
      pageSize: ISSUE_COMMENT_PAGE_SIZE,
      maxPages: JUMP_TO_LATEST_MAX_COMMENT_PAGES,
      fetchPage: (afterCommentId) =>
        issuesApi.listComments(issueId!, {
          order: "desc",
          limit: ISSUE_COMMENT_PAGE_SIZE,
          after: afterCommentId,
        }),
    });
    queryClient.setQueryData<InfiniteData<IssueComment[], string | null>>(
      queryKeys.issues.comments(issueId!),
      loaded,
    );
    await new Promise<void>((resolve) => {
      if (typeof window === "undefined") {
        resolve();
        return;
      }
      window.requestAnimationFrame(() => resolve());
    });
  }, [issueId, queryClient, refetchComments, paginatedConversation, recentComments.refetch]);
  useEffect(() => {
    if (
      !shouldPrefetchOlderComments &&
      !(historyExpanded && linkedCommentPending && hasOlderComments && !commentsLoadingOlder)
    )
      return;
    void fetchOlderComments();
  }, [
    fetchOlderComments,
    shouldPrefetchOlderComments,
    historyExpanded,
    linkedCommentPending,
    hasOlderComments,
    commentsLoadingOlder,
  ]);
  const handleCommentVote = useCallback(
    async (
      commentId: string,
      vote: "up" | "down",
      options?: { allowSharing?: boolean; reason?: string },
    ) => {
      await feedbackVoteMutation.mutateAsync({
        targetType: "issue_comment",
        targetId: commentId,
        vote,
        reason: options?.reason,
        allowSharing: options?.allowSharing,
        sharingPreferenceAtSubmit: feedbackDataSharingPreference,
      });
    },
    [feedbackDataSharingPreference, feedbackVoteMutation],
  );
  const handleChatAdd = useCallback(
    async (
      body: string,
      reopen?: boolean,
      reassignment?: CommentReassignment,
      attachmentIds?: string[],
      clientRequestId?: string,
      runSettings?: ComposerRunSettings,
    ) => {
      if (!issue?.conversationAgentId && (reassignment || runSettings)) {
        await addCommentAndReassign.mutateAsync({
          body,
          reopen,
          reassignment,
          attachmentIds,
          clientRequestId,
          runSettings,
        });
        return;
      }
      await addComment.mutateAsync({ body, reopen, attachmentIds, clientRequestId, runSettings });
    },
    [addComment, addCommentAndReassign, issue?.conversationAgentId],
  );
  const handleCommentImageUpload = useCallback(
    async (file: File) => {
      const attachment = await uploadAttachment.mutateAsync(file);
      return attachment.contentPath;
    },
    [uploadAttachment],
  );
  const handleCommentAttachImage = useCallback(
    async (file: File) => {
      return uploadAttachment.mutateAsync(file);
    },
    [uploadAttachment],
  );
  const handleInterruptQueuedRun = useCallback(
    async (runId: string | null) => {
      return interruptQueuedComment.mutateAsync(runId);
    },
    [interruptQueuedComment],
  );
  const runFinalizationActions = useMemo<
    readonly IssueChatRunFinalizationAction[]
  >(
    () => [
      {
        id: "cancel",
        label: "Stop and cancel",
        pendingLabel: "Stopping and cancelling...",
        isPending:
          stopAndFinalizeRun.isPending &&
          stopAndFinalizeRun.variables?.status === "cancelled",
        disabled: stopAndFinalizeRun.isPending,
        onSelect: (runId) =>
          stopAndFinalizeRun.mutateAsync({ runId, status: "cancelled" }).then(
            () => undefined,
            () => undefined,
          ),
      },
      {
        id: "done",
        label: "Stop and done",
        pendingLabel: "Stopping and marking done...",
        isPending:
          stopAndFinalizeRun.isPending &&
          stopAndFinalizeRun.variables?.status === "done",
        disabled: stopAndFinalizeRun.isPending,
        onSelect: (runId) =>
          stopAndFinalizeRun.mutateAsync({ runId, status: "done" }).then(
            () => undefined,
            () => undefined,
          ),
      },
    ],
    [
      stopAndFinalizeRun.isPending,
      stopAndFinalizeRun.mutateAsync,
      stopAndFinalizeRun.variables?.status,
    ],
  );
  const handleAcceptInteraction = useCallback(
    async (
      interaction: ActionableIssueThreadInteraction,
      selectedClientKeys?: string[],
      selectedOptionIds?: string[],
      rememberAction?: boolean,
    ) => {
      await acceptInteraction.mutateAsync({
        interaction,
        selectedClientKeys,
        selectedOptionIds,
        rememberAction,
      });
    },
    [acceptInteraction],
  );
  const handleRejectInteraction = useCallback(
    async (interaction: ActionableIssueThreadInteraction, reason?: string) => {
      await rejectInteraction.mutateAsync({ interaction, reason });
    },
    [rejectInteraction],
  );
  const handleSubmitInteractionAnswers = useCallback(
    async (
      interaction: IssueThreadInteraction,
      answers: AskUserQuestionsAnswer[],
    ) => {
      await answerInteraction.mutateAsync({ interaction, answers });
    },
    [answerInteraction],
  );
  const handleCancelInteraction = useCallback(
    async (interaction: AskUserQuestionsInteraction) => {
      await cancelInteraction.mutateAsync({ interaction });
    },
    [cancelInteraction],
  );
  const handleSkipInteraction = useCallback(
    async (interaction: IssueThreadInteraction) => {
      await skipInteraction.mutateAsync({ interaction });
    },
    [skipInteraction],
  );
  const handleSubmitInteractionVerdicts = useCallback(
    async (
      interaction: RequestItemVerdictsInteraction,
      verdicts: {
        id: string;
        verdict: RequestItemVerdictValue;
        reason?: string;
      }[],
    ) => {
      await submitInteractionVerdicts.mutateAsync({ interaction, verdicts });
    },
    [submitInteractionVerdicts],
  );
  const canResumeFromBacklog =
    issue?.status === "backlog" &&
    Boolean(issue.assigneeAgentId || issue.assigneeUserId);
  const handleResumeFromBacklog = useCallback(async () => {
    await updateIssue.mutateAsync({ status: "todo" });
  }, [updateIssue.mutateAsync]);
  // Resume a paused assignee agent straight from the thread notice: a paused
  // assignee silently drops every assignment wake, so the fix belongs next to
  // the explanation.
  const issueAssigneeAgentIdForResume = issue?.assigneeAgentId ?? null;
  const issueCompanyIdForResume = issue?.companyId ?? null;
  const issueStatusForResume = issue?.status ?? null;
  const issueIdForResume = issue?.id ?? null;
  const resumeAssigneeAgent = useMutation({
    mutationFn: async () => {
      if (!issueAssigneeAgentIdForResume) throw new Error("No assignee agent");
      await agentsApi.resume(
        issueAssigneeAgentIdForResume,
        issueCompanyIdForResume ?? undefined,
      );
      // The pause silently dropped this issue's assignment wake, so resuming
      // alone would leave the task idle until some other trigger fires.
      // Re-issue the wake for executable statuses; best-effort — the agent is
      // resumed either way and the next comment or timer also wakes it.
      if (
        issueIdForResume &&
        (issueStatusForResume === "todo" ||
          issueStatusForResume === "in_progress")
      ) {
        try {
          await agentsApi.wakeup(
            issueAssigneeAgentIdForResume,
            {
              source: "assignment",
              reason: "Assignee resumed from the task page",
              payload: {
                issueId: issueIdForResume,
                mutation: "assignee_resumed",
              },
            },
            issueCompanyIdForResume ?? undefined,
          );
        } catch {
          // Non-fatal: the resume succeeded; the wake retries on the next trigger.
        }
      }
    },
    onSuccess: async () => {
      if (issueCompanyIdForResume) {
        await queryClient.invalidateQueries({
          queryKey: queryKeys.agents.list(issueCompanyIdForResume),
        });
      }
    },
  });
  const handleResumeAssignee = useCallback(async () => {
    await resumeAssigneeAgent.mutateAsync();
  }, [resumeAssigneeAgent.mutateAsync]);
  const activeRecoveryActionId = issue?.activeRecoveryAction?.id;
  const handleResolveRecoveryAction = useCallback(
    (
      outcome: import("../components/IssueRecoveryActionCard").RecoveryResolveOutcome,
    ) => {
      const actionId = activeRecoveryActionId;
      if (!actionId) return;
      switch (outcome) {
        case "todo":
          void resolveRecoveryAction.mutateAsync({
            actionId,
            outcome: "restored",
            sourceIssueStatus: "todo",
          });
          return;
        case "done":
          void resolveRecoveryAction.mutateAsync({
            actionId,
            outcome: "restored",
            sourceIssueStatus: "done",
          });
          return;
        case "in_review":
          void resolveRecoveryAction.mutateAsync({
            actionId,
            outcome: "restored",
            sourceIssueStatus: "in_review",
          });
          return;
        case "false_positive_done":
          void resolveRecoveryAction.mutateAsync({
            actionId,
            outcome: "false_positive",
            sourceIssueStatus: "done",
          });
          return;
        case "false_positive_in_review":
          void resolveRecoveryAction.mutateAsync({
            actionId,
            outcome: "false_positive",
            sourceIssueStatus: "in_review",
          });
          return;
      }
    },
    [activeRecoveryActionId, resolveRecoveryAction.mutateAsync],
  );
  const handleTryAgainNoLiveExecutionPath = useCallback(() => {
    handleResolveRecoveryAction("todo");
  }, [handleResolveRecoveryAction]);

  // Action 3 (workspace_validation): one-click re-issue of the stalled task on a fresh isolated
  // git worktree based on the live (diverged) branch. Composes the existing safe issue-creation
  // endpoint — it never mutates the current workspace, so the operator's commits are preserved.
  const reissueIsolatedRecoveryAction = useMutation({
    mutationFn: async (
      request: import("../components/IssueRecoveryActionCard").RecoveryReissueRequest,
    ) => {
      if (!issue) throw new Error("Task is not loaded yet.");
      const sourceLabel = issue.identifier ?? "the stalled task";
      const descriptionLines = [
        `Re-issued from ${sourceLabel} on an isolated git worktree after a workspace branch divergence.`,
        "",
        `- Base ref (live branch): \`${request.baseRef}\``,
        ...(request.expectedBranch
          ? [`- Recorded branch: \`${request.expectedBranch}\``]
          : []),
        "",
        "---",
        "",
        issue.description ?? "",
      ];
      return issuesApi.create(issue.companyId, {
        title: `Re-issue (isolated): ${issue.title ?? sourceLabel}`,
        description: descriptionLines.join("\n"),
        priority: issue.priority,
        projectId: issue.projectId ?? null,
        parentId: issue.parentId ?? null,
        assigneeAgentId:
          issue.activeRecoveryAction?.returnOwnerAgentId ??
          issue.activeRecoveryAction?.previousOwnerAgentId ??
          issue.assigneeAgentId ??
          null,
        executionWorkspacePreference: "isolated_workspace",
        executionWorkspaceSettings: {
          mode: "isolated_workspace",
          workspaceStrategy: { type: "git_worktree", baseRef: request.baseRef },
        },
      });
    },
    onSuccess: (created) => {
      invalidateIssueCollections();
      pushToast({
        title: "Isolated re-issue created",
        body: created.identifier
          ? `${created.identifier} will run on a fresh isolated workspace.`
          : "A fresh isolated re-issue was created.",
        tone: "success",
      });
      if (created.identifier) {
        navigate(createIssueDetailPath(created.identifier));
      }
    },
    onError: (err) => {
      pushToast({
        title: "Re-issue failed",
        body:
          err instanceof Error
            ? err.message
            : "Unable to create an isolated re-issue.",
        tone: "error",
      });
    },
  });
  const handleReissueIsolatedRecoveryAction = useCallback(
    (
      request: import("../components/IssueRecoveryActionCard").RecoveryReissueRequest,
    ) => {
      void reissueIsolatedRecoveryAction.mutateAsync(request);
    },
    [reissueIsolatedRecoveryAction.mutateAsync],
  );

  // Actions 1 & 2 (workspace_validation): reconcile the recorded workspace branch to the live one
  // via the S4 (PAP-1586) op. `forward` is the ancestry-proven safe path (server re-verifies);
  // `override` is the audited, permission-gated break-glass carrying the operator's reason. Both
  // resolve the matching recovery action server-side, so the task resumes via the existing flow.
  const reconcileRecoveryAction = useMutation({
    // The target workspace id is captured at click time (see the handlers below) and threaded
    // through as an explicit argument, so the in-flight mutation always reconciles the workspace
    // the operator saw on the card — never a value re-read from a `issue` snapshot that may have
    // been refetched to a different `executionWorkspaceId` while the request was pending.
    mutationFn: async (
      input:
        | { workspaceId: string; mode: "forward" }
        | { workspaceId: string; mode: "override"; reason: string }
        | { workspaceId: string; mode: "quarantine_restore" },
    ) => {
      const { workspaceId, ...body } = input;
      return executionWorkspacesApi.reconcile(workspaceId, body);
    },
    onSuccess: (_result, variables) => {
      // Refresh the detail card itself (not just the list collections): a successful reconcile
      // clears the active recovery action, so the card must re-fetch to stop showing stale actions.
      invalidateIssueDetail();
      invalidateIssueCollections();
      pushToast(
        variables.mode === "quarantine_restore"
          ? {
              title: "Workspace repaired",
              body: "Dirty changes were quarantined onto a rescue branch and the recorded branch restored; the task will resume.",
              tone: "success",
            }
          : {
              title: "Workspace branch reconciled",
              body: "The recorded branch now matches the live branch; the task will resume.",
              tone: "success",
            },
      );
    },
    onError: (err) => {
      pushToast({
        title: "Reconcile failed",
        body:
          err instanceof Error
            ? err.message
            : "Unable to reconcile the workspace branch.",
        tone: "error",
      });
    },
  });
  // Bind the workspace id at the moment the operator clicks, from the same render that produced the
  // visible recovery card, rather than re-reading it inside the async mutation body. The target is
  // the workspace pinned by the recovery action's evidence — the workspace that actually diverged —
  // not the page-level `issue.executionWorkspaceId`, which can drift (e.g. a re-issue rebinds the
  // issue to a new workspace) while the card still shows the older action. Fall back to the
  // page-level id only when the action carries no workspace reference.
  const reconcileExecutionWorkspaceId =
    readRecoveryReconcileWorkspaceId(issue?.activeRecoveryAction) ??
    issue?.executionWorkspaceId ??
    null;
  const handleReconcileForwardRecoveryAction = useCallback(() => {
    if (!reconcileExecutionWorkspaceId) {
      pushToast({
        title: "Reconcile failed",
        body: "This task has no execution workspace to reconcile.",
        tone: "error",
      });
      return;
    }
    void reconcileRecoveryAction.mutateAsync({
      workspaceId: reconcileExecutionWorkspaceId,
      mode: "forward",
    });
  }, [
    reconcileExecutionWorkspaceId,
    reconcileRecoveryAction.mutateAsync,
    pushToast,
  ]);
  const handleBreakGlassOverrideRecoveryAction = useCallback(
    (reason: string) => {
      if (!reconcileExecutionWorkspaceId) {
        pushToast({
          title: "Reconcile failed",
          body: "This task has no execution workspace to reconcile.",
          tone: "error",
        });
        return;
      }
      void reconcileRecoveryAction.mutateAsync({
        workspaceId: reconcileExecutionWorkspaceId,
        mode: "override",
        reason,
      });
    },
    [
      reconcileExecutionWorkspaceId,
      reconcileRecoveryAction.mutateAsync,
      pushToast,
    ],
  );
  // Repair action (workspace_validation, dirty divergence): quarantine the dirty worktree onto a
  // rescue branch and restore the recorded branch. Lossless — no reason required.
  const handleQuarantineRestoreRecoveryAction = useCallback(() => {
    if (!reconcileExecutionWorkspaceId) {
      pushToast({
        title: "Repair failed",
        body: "This task has no execution workspace to repair.",
        tone: "error",
      });
      return;
    }
    void reconcileRecoveryAction.mutateAsync({
      workspaceId: reconcileExecutionWorkspaceId,
      mode: "quarantine_restore",
    });
  }, [
    reconcileExecutionWorkspaceId,
    reconcileRecoveryAction.mutateAsync,
    pushToast,
  ]);

  const treePreviewAffectedIssues = useMemo(
    () =>
      (treeControlPreview?.issues ?? []).filter(
        (candidate) => !candidate.skipped,
      ),
    [treeControlPreview],
  );
  const activePauseHold = treeControlState?.activePauseHold ?? null;
  const activeRootPauseHoldsForDisplay = useMemo(
    () => (activePauseHold?.isRoot === true ? activeRootPauseHolds : []),
    [activePauseHold?.isRoot, activeRootPauseHolds],
  );
  const heldIssueIds = useMemo(() => {
    const ids = new Set<string>();
    for (const hold of activeRootPauseHoldsForDisplay) {
      for (const member of hold.members ?? []) {
        if (member.skipped) continue;
        ids.add(member.issueId);
      }
    }
    return ids;
  }, [activeRootPauseHoldsForDisplay]);
  const mutedChildIssueIds = useMemo(() => {
    const ids = new Set<string>();
    for (const child of childIssues) {
      if (heldIssueIds.has(child.id)) ids.add(child.id);
    }
    return ids;
  }, [childIssues, heldIssueIds]);
  const childPauseBadgeById = useMemo(() => {
    const badges = new Map<string, string>();
    for (const child of childIssues) {
      if (!heldIssueIds.has(child.id)) continue;
      badges.set(child.id, "Paused");
    }
    return badges;
  }, [childIssues, heldIssueIds]);
  const activePauseHoldRoot = useMemo(() => {
    if (!activePauseHold) return null;
    if (activePauseHold.rootIssueId === issue?.id) return issue ?? null;
    return (
      issue?.ancestors?.find(
        (ancestor) => ancestor.id === activePauseHold.rootIssueId,
      ) ?? null
    );
  }, [activePauseHold, issue]);

  // The loaded task stays on screen while a refetch fails (the connection
  // banner explains the outage); the skeleton covers an outage before the
  // first load; only a real failure replaces the pane.
  if (
    (!issue && !accessError && (isLoading || coreIssueQuery.isPending || coreIssueView.kind === "reconnecting")) ||
    (issueView.kind === "reconnecting" && (!issue || (isPlaceholderData && !coreIssueQuery.data)))
  )
    return <IssueDetailLoadingState headerSeed={issueHeaderSeed} />;
  if (!issue || (issueView.kind === "error" && isPlaceholderData && !coreIssueQuery.data)) {
    const pageError = accessError ?? error ?? coreIssueQuery.error;
    if (pageError) {
      return (
        <QueryErrorState
          size="page"
          error={pageError}
          action="load this task"
          onRetry={coreIssueQuery.error ? coreIssueView.retry : issueView.retry}
          retrying={issueView.isFetching || coreIssueView.isFetching}
        />
      );
    }
  }
  if (!issue) return null;
  // Do not expose a file chooser on the outgoing UUID/company/interface
  // branch: its input can be detached before the chosen file is returned.
  // Keep the existing metadata/header skeleton until the canonical view owns
  // the interaction; comments may then load without another route-key change.
  if (!taskRouteReady || !taskInterfaceSettingsLoaded)
    return (
      <IssueDetailLoadingState
        titleEditor={taskRouteReady && !issue.conversationAgentId ? (
          // The account-bound title editor can retain input before the first
          // session lookup. Presentation-specific controls still wait below.
          <InlineEditor
            value={issue.title}
            onSave={(title) => updateIssue.mutateAsync({ title })}
            draftKey={`issue:${issue.id}:title`}
            as="h2"
            className="text-xl font-semibold leading-normal"
          />
        ) : undefined}
        headerSeed={
          loadedIssue
            ? readIssueDetailHeaderSeed(
                withIssueDetailHeaderSeed(null, loadedIssue),
              )
            : issueHeaderSeed
        }
      />
    );

  // Ancestors are returned oldest-first from the server (root at end, immediate parent at start)
  const ancestors = issue.ancestors ?? [];
  const legacyRecoverySourceIssue = (() => {
    if (
      issue.originKind !== "stranded_issue_recovery" &&
      issue.originKind !== "stale_active_run_evaluation"
    ) {
      return null;
    }
    const parent = ancestors.length > 0 ? ancestors[0] : null;
    if (!parent || isLockedIssueStub(parent)) return null;
    const ref = parent.identifier ?? parent.id;
    return {
      identifier: parent.identifier ?? null,
      title: parent.title ?? null,
      href: createIssueDetailPath(ref),
    };
  })();
  const handleFilePicked = async (evt: ChangeEvent<HTMLInputElement>) => {
    const files = evt.target.files;
    if (!files || files.length === 0) return;
    for (const file of Array.from(files)) {
      if (isMarkdownFile(file)) {
        await importMarkdownDocument.mutateAsync(file);
      } else {
        await uploadAttachment.mutateAsync(file);
      }
    }
    if (fileInputRef.current) {
      fileInputRef.current.value = "";
    }
  };

  const handleAttachmentDrop = async (evt: DragEvent<HTMLDivElement>) => {
    evt.preventDefault();
    setAttachmentDragActive(false);
    const files = evt.dataTransfer.files;
    if (!files || files.length === 0) return;
    for (const file of Array.from(files)) {
      if (isMarkdownFile(file)) {
        await importMarkdownDocument.mutateAsync(file);
      } else {
        await uploadAttachment.mutateAsync(file);
      }
    }
  };

  const hasAttachments = attachmentList.length > 0;
  const canShowSubtreeControls = canManageTreeControl && childIssues.length > 0;
  const canResumeSubtree =
    canShowSubtreeControls && activePauseHold?.isRoot === true;
  const canRestoreSubtree =
    canShowSubtreeControls && activeCancelHolds.length > 0;
  const isTerminalIssue =
    issue.status === "done" || issue.status === "cancelled";
  const isAgentOwnedNonTerminalIssue =
    Boolean(issue.assigneeAgentId) && !isTerminalIssue;
  const canPauseLeafWork =
    canManageTreeControl &&
    childIssues.length === 0 &&
    !activePauseHold &&
    !isTerminalIssue;
  const canResumeLeafWork =
    canManageTreeControl &&
    childIssues.length === 0 &&
    activePauseHold?.isRoot === true;
  const treeControlScope: "leaf" | "subtree" =
    childIssues.length === 0 ? "leaf" : "subtree";
  const previewAffectedIssueCount = treePreviewAffectedIssues.length;
  const previewAffectedAgentCount =
    treeControlPreview?.totals.affectedAgents ?? 0;
  const reopenComposerHint = closedIsolatedWorkspaceReopenPending
    ? "This issue's isolated workspace was archived. Your next comment or resume reopens it and rebuilds the worktree."
    : null;
  const composerHint = activePauseHold ? null : reopenComposerHint;
  const queuedCommentReason: "hold" | "active_run" | "other" = activePauseHold
    ? "hold"
    : "active_run";
  const canApplyTreeControl =
    Boolean(treeControlPreview) &&
    !treeControlPreviewLoading &&
    !treeControlPreviewError;
  const attachmentUploadButton = (
    <>
      <input
        ref={fileInputRef}
        type="file"
        className="hidden"
        onChange={handleFilePicked}
        multiple
      />
      <Button
        variant="outline"
        size="sm"
        onClick={() => fileInputRef.current?.click()}
        disabled={
          uploadAttachment.isPending || importMarkdownDocument.isPending
        }
        className={cn(
          "shadow-none",
          attachmentDragActive && "border-primary bg-primary/5",
        )}
      >
        <Paperclip className="h-3.5 w-3.5 mr-1.5" />
        {uploadAttachment.isPending || importMarkdownDocument.isPending ? (
          "Uploading..."
        ) : (
          <>
            <span className="hidden sm:inline">Upload attachment</span>
            <span className="sm:hidden">Upload</span>
          </>
        )}
      </Button>
    </>
  );

  // Task Chat Redesign ("not sticky" header): the parent breadcrumb, the
  // title/badge block, and the plugin toolbars render INSIDE the thread's
  // scroll viewport, so they scroll away with the messages and the composer
  // stays near the viewport bottom. Flag OFF renders the same nodes in the
  // page flow, in their original order relative to the alert banners.
  const ancestorsNav =
    !streamlinedTaskDetailEnabled && ancestors.length > 0 ? (
      <nav
        className={cn(
          "flex items-center gap-1 text-xs text-muted-foreground flex-wrap",
          shellSectionClass,
        )}
      >
        {[...ancestors].reverse().map((ancestor, i) => (
          <span key={ancestor.id} className="flex items-center gap-1">
            {i > 0 && <ChevronRight className="h-3 w-3 shrink-0" />}
            {isLockedIssueStub(ancestor) ? <LockedIssueChip identifier={ancestor.identifier} /> : <Link
              to={createIssueDetailPath(ancestor.identifier ?? ancestor.id)}
              state={resolvedIssueDetailState ?? location.state}
              onClickCapture={() =>
                rememberIssueDetailLocationState(
                  ancestor.identifier ?? ancestor.id,
                  resolvedIssueDetailState ?? location.state,
                  location.search,
                )
              }
              className="hover:text-foreground transition-colors truncate max-w-(--sz-200px)"
              title={ancestor.title}
            >
              {ancestor.title}
            </Link>}
          </span>
        ))}
        <ChevronRight className="h-3 w-3 shrink-0" />
        <span className="text-foreground/60 truncate max-w-(--sz-200px)">
          {issue.title}
        </span>
      </nav>
    ) : null;
  // Creation provenance ("Created from PAP-168 by Paperclip QA"). Distinct from
  // the parent chain above; the streamlined Tasks tab renders it instead.
  const createdFromNote =
    !streamlinedTaskDetailEnabled && issue.createdFrom ? (
      <IssueCreatedFromNote
        createdFrom={issue.createdFrom}
        issueLinkState={resolvedIssueDetailState ?? location.state}
        className={shellSectionClass}
      />
    ) : null;

  const issueStatusControl = (
    <StatusIcon
      status={issue.status} externalConversationState={issue.externalConversationState}
      size={proposedTaskHeader ? "md" : "lg"}
      blockerAttention={issue.blockerAttention}
      onChange={(status) => updateIssue.mutate({ status })}
    />
  );

  const issueHeaderBlock = issue.conversationAgentId ? null : (
    <div
      data-testid="issue-detail-header"
      className={cn(
        streamlinedTaskDetailEnabled ? "relative space-y-2" : "space-y-3",
        shellSectionClass,
      )}
    >
      {streamlinedTaskDetailEnabled ? (
        <div className="flex min-w-0 items-start gap-2 md:items-center md:pr-8">
          {!proposedTaskHeader ? (
            <div className="hidden md:block">{issueStatusControl}</div>
          ) : null}
          <div
            data-slot="task-detail-title"
            className="flex min-w-0 flex-1 items-baseline gap-2"
          >
            <InlineEditor
              value={issue.title}
              onSave={(title) => updateIssue.mutateAsync({ title })}
              draftKey={`issue:${issue.id}:title`}
              as="h2"
              className={cn(
                "min-w-0 text-balance",
                proposedTaskHeader ? "text-2xl font-normal text-foreground" : "text-xl font-semibold",
                "leading-normal",
              )}
            />
            {!proposedTaskHeader ? (
              <span
                data-slot="task-title-identifier"
                className="hidden shrink-0 font-mono text-sm text-muted-foreground md:inline"
              >
                {issue.identifier ?? issue.id.slice(0, 8)}
              </span>
            ) : null}
          </div>
        </div>
      ) : null}

      <div
        className={cn(
          "flex min-w-0 flex-wrap items-center gap-2",
          streamlinedTaskDetailEnabled &&
            (proposedTaskHeader ? "gap-x-6 gap-y-2" : "gap-x-3 gap-y-2 md:gap-x-6 md:pl-7"),
        )}
      >
        {proposedTaskHeader ? (
          <div className="flex shrink-0 items-center gap-2">
            {issueStatusControl}
            <span data-slot="task-title-identifier" className="font-mono text-sm text-muted-foreground">
              {issue.identifier ?? issue.id.slice(0, 8)}
            </span>
          </div>
        ) : null}
        {streamlinedTaskDetailEnabled && !proposedTaskHeader ? (
          <div className="md:hidden">{issueStatusControl}</div>
        ) : null}
        {streamlinedTaskDetailEnabled && !proposedTaskHeader ? (
          <span className="shrink-0 font-mono text-sm text-muted-foreground md:hidden">
            {issue.identifier ?? issue.id.slice(0, 8)}
          </span>
        ) : null}
        {!streamlinedTaskDetailEnabled ? issueStatusControl : null}
        {/* PAP-411: priority UI hidden behind SHOW_TASK_PRIORITY_UI. */}
        {SHOW_TASK_PRIORITY_UI && (
          <PriorityIcon
            priority={issue.priority}
            onChange={(priority) => updateIssue.mutate({ priority })}
          />
        )}
        {!streamlinedTaskDetailEnabled ? (
          <span className="shrink-0 font-mono text-sm text-muted-foreground">
            {issue.identifier ?? issue.id.slice(0, 8)}
          </span>
        ) : null}
        {hasLiveRuns && (
          <Badge
            variant="outline"
            className={cn("gap-1.5 text-(length:--text-nano)", liveBlueBadge)}
          >
            <span className="relative flex h-1.5 w-1.5">
              <span className="animate-pulse absolute inline-flex h-full w-full rounded-full bg-blue-400 opacity-75" />
              <span className="relative inline-flex rounded-full h-1.5 w-1.5 bg-blue-500" />
            </span>
            Live
          </Badge>
        )}

        {issue.originKind === "routine_execution" && issue.originId && (
          <Link
            to={`/routines/${issue.originId}`}
            className="inline-flex items-center gap-1 rounded-full bg-violet-500/10 border border-violet-500/30 px-2 py-0.5 text-(length:--text-nano) font-medium text-violet-600 dark:text-violet-400 shrink-0 hover:bg-violet-500/20 transition-colors"
            title={`Routine execution from routine ${issue.originId}`}
          >
            <Repeat className="h-3 w-3" />
            Routine
          </Link>
        )}

        {issue.originKind === "task_watchdog" ? (
          <Badge
            variant="outline"
            className="border-sky-500/40 bg-sky-500/10 text-(length:--text-nano) text-sky-700 dark:text-sky-300"
            title="This task is a generated watchdog task. It verifies whether stopped work in the watched task tree is legitimate."
          >
            <ScanEye className="h-3 w-3" />
            Watchdog
          </Badge>
        ) : null}

        {/* Task Chat Redesign: no mode chip in the header — mode is a
              per-request choice made in the composer, and each agent reply
              carries its own mode chip; a header chip would misread as a
              task-global setting. Flag OFF keeps the legacy badge. */}
        {!taskChatShellEnabled &&
        (issue.workMode === "ask" || issue.workMode === "planning")
          ? (() => {
              const workModeMeta = workModeMetaFor(issue.workMode);
              const WorkModeIcon = workModeMeta.icon;
              return (
                <Badge
                  variant="outline"
                  className={cn(
                    "text-(length:--text-nano)",
                    workModeMeta.classes.badge,
                  )}
                  title={`This task is in ${workModeMeta.label.toLowerCase()}.`}
                >
                  <WorkModeIcon className="h-3 w-3" aria-hidden />
                  {workModeMeta.label}
                </Badge>
              );
            })()
          : null}

        {hasAssignedBacklogBlocker(issue.blockedBy) ? (
          <Badge
            variant="outline"
            data-testid="issue-detail-parked-blocker"
            className="border-amber-500/60 bg-amber-500/15 text-(length:--text-nano) text-amber-700 dark:text-amber-300"
            title="Blocked by parked work — at least one assigned blocker is in backlog and will not wake its assignee."
          >
            <Flag className="h-3 w-3" />
            Blocked by parked work
          </Badge>
        ) : null}

        {/* Project reads as a tile plus a name, matching the project rows in
              the sidebar and the Projects list rather than a bare outline
              glyph. The tile stays neutral here on purpose: the eyebrow already
              carries the status glyph's colour, and a second tinted swatch
              beside it competes with the one signal that means something.
              Project colour still identifies the project on project-native
              surfaces. */}
        {issue.projectId ? (
          <Link
            to={`/projects/${issue.projectId}`}
            className="inline-flex items-center gap-1 text-xs text-muted-foreground hover:text-foreground transition-colors rounded px-1 -mx-1 py-0.5 min-w-0"
          >
            <ProjectTile
              size="xs"
              icon={resolvedProject?.icon ?? issue.project?.icon}
            />
            <span className="truncate">
              {resolvedProject?.name ??
                issue.project?.name ??
                issue.projectId.slice(0, 8)}
            </span>
          </Link>
        ) : (
          <span className="inline-flex items-center gap-1 text-xs text-muted-foreground opacity-50 px-1 -mx-1 py-0.5">
            <ProjectTile size="xs" />
            No project
          </span>
        )}

        <IssueAttributionByline
          issue={issue}
          agentMap={agentMap}
          userProfileMap={userProfileMap}
          userLabelMap={userLabelMap}
        />

        {!streamlinedTaskDetailEnabled && (issue.labels ?? []).length > 0 && (
          <div className="hidden sm:flex items-center gap-1">
            {(issue.labels ?? []).slice(0, 4).map((label) => (
              <Badge
                variant="outline"
                key={label.id}
                className="text-(length:--text-nano)"
                style={{
                  borderColor: label.color,
                  color: pickTextColorForPillBg(label.color, 0.12),
                  backgroundColor: `${label.color}1f`,
                }}
              >
                {label.name}
              </Badge>
            ))}
            {(issue.labels ?? []).length > 4 && (
              <span className="text-(length:--text-nano) text-muted-foreground">
                +{(issue.labels ?? []).length - 4}
              </span>
            )}
          </div>
        )}

        {!streamlinedTaskDetailEnabled && !(isMobile && isFromInbox) && (
          <div className="ml-auto flex items-center gap-0.5 md:hidden shrink-0">
            <Button
              variant="ghost"
              size="icon-xs"
              onClick={copyIssueToClipboard}
              title="Copy task as markdown"
            >
              {copied ? (
                <Check className="h-4 w-4 text-green-500" />
              ) : (
                <Copy className="h-4 w-4" />
              )}
            </Button>
            <Button
              variant="ghost"
              size="icon-xs"
              onClick={() => setMobilePropsOpen(true)}
              title="Properties"
            >
              <SlidersHorizontal className="h-4 w-4" />
            </Button>
          </div>
        )}

        <div className="hidden md:flex items-center md:ml-auto shrink-0">
          {!streamlinedTaskDetailEnabled && canArchiveFromInbox && (
            <Button
              variant="ghost"
              size="icon-xs"
              onClick={() => {
                if (!archivePending && issue?.id)
                  archiveFromInbox.mutate(issue.id);
              }}
              disabled={archivePending}
              title="Archive from inbox"
              aria-label="Archive from inbox"
            >
              <Archive className="h-4 w-4" />
            </Button>
          )}
          {fileViewerEnabled ? (
            <Button
              variant="ghost"
              size="icon-xs"
              onClick={() => setFileViewerPromptOpen(true)}
              title="Open file... (g f)"
              aria-label="Open file in this issue"
            >
              <FileCode2 className="h-4 w-4" />
            </Button>
          ) : null}
          {!streamlinedTaskDetailEnabled ? (
            <Button
              variant="ghost"
              size="icon-xs"
              onClick={copyIssueToClipboard}
              title="Copy task as markdown"
            >
              {copied ? (
                <Check className="h-4 w-4 text-green-500" />
              ) : (
                <Copy className="h-4 w-4" />
              )}
            </Button>
          ) : null}
          {!streamlinedTaskDetailEnabled &&
          !taskChatShellEnabled &&
          (!panelVisible || suppressPanelUntilPlan) ? (
            <TooltipProvider>
              <SidePanelToggleButton
                open={false}
                onToggle={openTaskSidePanel}
                shortcut="]"
                className="shrink-0"
              />
            </TooltipProvider>
          ) : null}
          <div
            data-slot="task-title-actions"
            className={cn(
              streamlinedTaskDetailEnabled &&
                "absolute right-0 top-0 flex h-7 items-center",
            )}
          >
            <IssuePrivacyActions
                issue={issue}
                companyId={issue.companyId}
                canManage={canManagePrivacy}
                closeMenu={() => setMoreOpen(false)}
                implicitPrincipals={privacyImplicitPrincipals}
>
                {(privacyMenuItems) => (
            <Popover open={moreOpen} onOpenChange={setMoreOpen}>
              <PopoverTrigger asChild>
                <Button
                  variant="ghost"
                  size="icon-xs"
                  className="shrink-0"
                  aria-label="More task actions"
                  title="More task actions"
                  onKeyDown={(event) => {
                    if (event.key === "Enter" || event.key === " ") {
                      event.preventDefault();
                      setMoreOpen(true);
                    }
                  }}
                >
                  <MoreHorizontal className={proposedTaskHeader ? "h-3 w-3" : "h-4 w-4"} />
                </Button>
              </PopoverTrigger>
              <PopoverContent className="w-52 p-1" align="end">
                {taskChatShellEnabled && !historyExpanded ? (
                  <button
                    className="flex w-full items-center gap-2 rounded px-2 py-1.5 text-xs hover:bg-accent/50"
                    onClick={() => {
                      expandHistory();
                      setMoreOpen(false);
                    }}
                  >
                    <ActivityIcon className="h-3 w-3" />
                    Show task activity
                  </button>
                ) : null}
                {streamlinedTaskDetailEnabled ? (
                  <>
                    <button
                      className="flex w-full items-center gap-2 rounded px-2 py-1.5 text-xs hover:bg-accent/50"
                      onClick={() => {
                        openNewSubIssue();
                        setMoreOpen(false);
                      }}
                    >
                      <Plus className="h-3 w-3" />
                      Add subtask
                    </button>
                    <button
                      className="flex w-full items-center gap-2 rounded px-2 py-1.5 text-xs hover:bg-accent/50"
                      onClick={() => {
                        void copyIssueToClipboard();
                        setMoreOpen(false);
                      }}
                    >
                      {copied ? (
                        <Check className="h-3 w-3" />
                      ) : (
                        <Copy className="h-3 w-3" />
                      )}
                      Copy as markdown
                    </button>
                    {canArchiveFromInbox ? (
                      <button
                        className="flex w-full items-center gap-2 rounded px-2 py-1.5 text-xs hover:bg-accent/50 disabled:opacity-50"
                        disabled={archivePending}
                        onClick={() => {
                          if (!archivePending && issue?.id)
                            archiveFromInbox.mutate(issue.id);
                          setMoreOpen(false);
                        }}
                      >
                        <Archive className="h-3 w-3" />
                        Archive from inbox
                      </button>
                    ) : null}
                  </>
                ) : null}
                {privacyMenuItems}
                <TaskTreeControlMenuItems
                  scope={treeControlScope}
                  canPause={
                    canPauseLeafWork ||
                    (canShowSubtreeControls &&
                      !activePauseHold &&
                      !isTerminalIssue)
                  }
                  canResume={canResumeLeafWork || canResumeSubtree}
                  canCancel={canShowSubtreeControls}
                  canRestore={canRestoreSubtree}
                  pending={executeTreeControl.isPending}
                  onPause={() => {
                    executeTreeControl.mutate({
                      mode: "pause",
                      scope: treeControlScope,
                    });
                    setMoreOpen(false);
                  }}
                  onResume={() => {
                    executeTreeControl.reset();
                    setTreeControlMode("resume");
                    setTreeControlWakeAgentsOnResume(
                      isAgentOwnedNonTerminalIssue || canShowSubtreeControls,
                    );
                    setTreeControlOpen(true);
                    setMoreOpen(false);
                  }}
                  onCancel={() => {
                    executeTreeControl.reset();
                    setTreeControlMode("cancel");
                    setTreeControlOpen(true);
                    setMoreOpen(false);
                  }}
                  onRestore={() => {
                    executeTreeControl.reset();
                    setTreeControlMode("restore");
                    setTreeControlWakeAgentsOnResume(false);
                    setTreeControlOpen(true);
                    setMoreOpen(false);
                  }}
                />
                <button
                  className="flex items-center gap-2 w-full px-2 py-1.5 text-xs rounded hover:bg-accent/50 text-destructive"
                  onClick={() => {
                    updateIssue.mutate(
                      { hiddenAt: new Date().toISOString() },
                      { onSuccess: () => navigate("/issues/all") },
                    );
                    setMoreOpen(false);
                  }}
                >
                  <EyeOff className="h-3 w-3" />
                  Hide this task
                </button>
              </PopoverContent>
            </Popover>
                )}
              </IssuePrivacyActions>
          </div>
        </div>
      </div>

      {!streamlinedTaskDetailEnabled ? (
        <InlineEditor
          value={issue.title}
          onSave={(title) => updateIssue.mutateAsync({ title })}
          draftKey={`issue:${issue.id}:title`}
          as="h2"
          className={
            taskChatShellEnabled
              ? "text-base font-semibold"
              : "text-xl font-bold"
          }
        />
      ) : null}

      {taskChatShellEnabled && !streamlinedTaskDetailEnabled
        ? subTasksTree
        : null}

      <IssueMonitorBanner
        key={issue.id}
        onCancelMonitor={() => cancelIssueMonitor.mutateAsync()}
        issue={issue}
        workProducts={workProducts}
        checkError={checkIssueMonitorNow.error ? describeError(checkIssueMonitorNow.error, { action: "check the monitor" }).body : null}
        onCheckNow={() => checkIssueMonitorNow.mutate()}
        checkingNow={checkIssueMonitorNow.isPending}
      />

      {taskChatShellEnabled ? null : (
        <InlineEditor
          value={issue.description ?? ""}
          onSave={(description) => updateIssue.mutateAsync({ description })}
          draftKey={`issue:${issue.id}:description`}
          as="p"
          className="text-sm leading-7 text-foreground"
          placeholder="Add a description..."
          multiline
          foldable
          mentions={mentionOptions}
          externalReferences={
            externalObjectsState.isEnabled
              ? externalObjectsState.markdownReferences
              : undefined
          }
          imageUploadHandler={async (file) => {
            const attachment = await uploadAttachment.mutateAsync(file);
            return attachment.contentPath;
          }}
          onDropFile={async (file) => {
            await uploadAttachment.mutateAsync(file);
          }}
        />
      )}
    </div>
  );

  const pluginOutletsBlock = (
    <>
      <PluginSlotOutlet
        slotTypes={["toolbarButton", "contextMenuItem"]}
        entityType="issue"
        context={{
          companyId: issue.companyId,
          projectId: issue.projectId ?? null,
          entityId: issue.id,
          entityType: "issue",
        }}
        className={cn("flex flex-wrap gap-2", shellSectionClass)}
        itemClassName="inline-flex"
        missingBehavior="placeholder"
      />

      <PluginLauncherOutlet
        placementZones={["toolbarButton"]}
        entityType="issue"
        context={{
          companyId: issue.companyId,
          projectId: issue.projectId ?? null,
          entityId: issue.id,
          entityType: "issue",
        }}
        className={cn("flex flex-wrap gap-2", shellSectionClass)}
        itemClassName="inline-flex"
      />

      <PluginSlotOutlet
        slotTypes={["taskDetailView"]}
        entityType="issue"
        context={{
          companyId: issue.companyId,
          projectId: issue.projectId ?? null,
          entityId: issue.id,
          entityType: "issue",
        }}
        className={cn("space-y-3", shellSectionClass)}
        itemClassName="rounded-lg border border-border p-3"
        missingBehavior="placeholder"
      />
    </>
  );

  const taskChatThreadHeader = taskChatShellEnabled ? (
    <>
      {ancestorsNav}
      {createdFromNote}
      {issueHeaderBlock}
      <TaskDecisionRecord companyId={issue.companyId} issueId={issue.id} viewerId={currentUserId} agentMap={agentMap} />
      {pluginOutletsBlock}
    </>
  ) : undefined;

  return (
    <FileViewerProvider issueId={conversation && !conversation.issue ? "" : issue.id} enabled={fileViewerEnabled}>
      <TextAttachmentContext.Provider value={taskChatShellEnabled ? handleOpenTextAttachment : null}><IssueGalleryContext.Provider value={openIssueGallery}>
        <div
          data-task-chat-shell={taskChatShellEnabled ? "" : undefined}
          className={
            taskChatShellEnabled
              ? // Fill main exactly so the outer page never scrolls — the
                  // thread's own viewport is the only scroll surface.
                  // Keep status banners close to the transcript. A full section
                  // gap here shortens the pinned message viewport enough to
                  // leave its first visible bubble sliced at the top edge.
                  "flex h-full min-h-0 w-full flex-col gap-3"
              : "max-w-3xl space-y-6"
          }
        >
          {error && coreIssueQuery.data && !isTransientError(error) ? (
            <div role="status" className="flex items-center gap-2 text-sm text-muted-foreground">
              Some task details could not be loaded.
              <Button type="button" variant="ghost" size="sm" onClick={() => void refetchIssueDetail()}>Retry</Button>
            </div>
          ) : null}
          {/* Parent chain breadcrumb (redesign: rendered inside the thread viewport) */}
          {taskChatShellEnabled ? null : ancestorsNav}
          {taskChatShellEnabled ? null : createdFromNote}

          <ExternallyConnectedTaskBanner
            className={cn(shellSectionClass, "mt-3")}
            key={issue.id}
            assigneeAgentId={issue.assigneeAgentId}
            attachments={attachments ?? []}
            companyId={issue.companyId}
            issueId={issue.id}
            issueCacheRefs={issueCacheRefs}
          />

          {resolvedDetailTab === "chat" && !issue.interruption && !issue.executionBlocker?.workspaceRecovery && (
            <WorkspaceExportRecovery key={`workspace-export:${issue.activeRecoveryAction?.id ?? issue.id}`}
              className={shellSectionClass}
              action={issue.activeRecoveryAction ?? null} />
          )}
          {resolvedDetailTab === "chat" && (
            <ExecutionBlockerNotice className={shellSectionClass} presentation={issue.interruption}
              issueId={issue.id} agentName={agentMap.get(issue.assigneeAgentId ?? "")?.name} projectName={issue.project?.name}
              canRetry={canResolveBoardRecoveryAction} onRetry={taskRetry.retry}
              optimistic={taskRetry.optimistic} takingLonger={taskRetry.takingLonger} error={taskRetry.error} />
          )}

          {issue.status === "in_review" && issue.externalConversationState === "waiting" && (
            <p role="status" className="text-sm text-muted-foreground">Reply sent. Send a message to continue.</p>
          )}

          {issue.hiddenAt && (
            <div
              className={cn(
                "flex items-center gap-2 rounded-md border border-destructive/30 bg-destructive/10 px-3 py-2 text-sm text-destructive",
                shellSectionClass,
                taskChatShellEnabled && (isMobile ? "mt-4" : "mt-3"),
              )}
            >
              <EyeOff className="h-4 w-4 shrink-0" />
              This task is hidden
            </div>
          )}
          {treeControlWakeWarning ? (
            <p
              role="alert"
              className={cn("text-sm text-muted-foreground", shellSectionClass)}
            >
              {treeControlWakeWarning}
            </p>
          ) : null}
          {executeTreeControl.error &&
            !treeControlOpen &&
            executeTreeControl.variables?.feedback !== "composer" && (
              <p
                role="alert"
                className={cn("text-sm text-destructive", shellSectionClass)}
              >
                {describeError(executeTreeControl.error).body}
              </p>
            )}

          {taskChatShellEnabled ? null : issueHeaderBlock}
          {taskChatShellEnabled ? null : <TaskDecisionRecord companyId={issue.companyId} issueId={issue.id} viewerId={currentUserId} agentMap={agentMap} />}

          {taskChatShellEnabled ? null : pluginOutletsBlock}

          {taskChatShellEnabled ? null : showRichSubIssuesSection ? (
            <div className="space-y-3">
              <div className="flex items-center justify-between gap-2">
                <h3 className="text-sm font-medium text-muted-foreground">
                  Sub-tasks
                </h3>
              </div>
              <IssuesList
                issues={childIssues}
                isLoading={childIssuesLoading}
                agents={agents}
                projects={projects}
                liveIssueIds={liveIssueIds}
                mutedIssueIds={mutedChildIssueIds}
                issueBadgeById={childPauseBadgeById}
                projectId={issue.projectId ?? undefined}
                viewStateKey={`paperclip:issue-detail:${issue.id}:subissues-view`}
                issueLinkState={resolvedIssueDetailState ?? location.state}
                searchFilters={{
                  descendantOf: issue.id,
                  includeBlockedBy: true,
                }}
                searchWithinLoadedIssues
                baseCreateIssueDefaults={buildSubIssueDefaultsForViewer(
                  issue,
                  currentUserId,
                )}
                createIssueLabel="Sub-task"
                defaultSortField="workflow"
                showProgressSummary
                parentIssueIdForCostSummary={issue.id}
                onUpdateIssue={handleChildIssueUpdate}
              />
            </div>
          ) : (
            <div className="flex flex-wrap items-center justify-end gap-2 min-w-0">
              <Button
                variant="outline"
                size="sm"
                onClick={openNewSubIssue}
                className="shrink-0 shadow-none"
              >
                <Plus className="mr-1.5 h-3.5 w-3.5" />
                New Sub-task
              </Button>
            </div>
          )}

          {!taskChatShellEnabled && showPlanDecompositionsSection ? (
            <IssuePlanDecompositionsSection
              issueId={issue.id}
              issueIdentifier={issue.identifier}
              agentMap={agentMap}
            />
          ) : null}

          {/* Flag ON: attachments/work products/workspace live in the properties
          pane (Artifacts tab) — the center column belongs to the thread. */}
          {taskChatShellEnabled ? null : (
            <IssueDocumentsSection
              issue={issue}
              canDeleteDocuments={Boolean(session?.user?.id)}
              canManageDocumentLocks={Boolean(session?.user?.id)}
              feedbackVotes={feedbackVotes}
              feedbackDataSharingPreference={feedbackDataSharingPreference}
              feedbackTermsUrl={FEEDBACK_TERMS_URL}
              mentions={mentionOptions}
              externalReferences={
                externalObjectsState.isEnabled
                  ? externalObjectsState.markdownReferences
                  : undefined
              }
              imageUploadHandler={async (file) => {
                const attachment = await uploadAttachment.mutateAsync(file);
                return attachment.contentPath;
              }}
              onVote={async (revisionId, vote, options) => {
                await feedbackVoteMutation.mutateAsync({
                  targetType: "issue_document_revision",
                  targetId: revisionId,
                  vote,
                  reason: options?.reason,
                  allowSharing: options?.allowSharing,
                  sharingPreferenceAtSubmit: feedbackDataSharingPreference,
                });
              }}
              extraActions={!hasAttachments ? attachmentUploadButton : null}
              agentMap={agentMap}
              userProfileMap={userProfileMap}
            />
          )}

          {taskChatShellEnabled ? null : (
            <IssueOutputSection
              workProducts={workProducts}
              onMediaClick={(item) => {
                const meta = item.metadata;
                if (!meta) return;
                const idx = mediaGalleryItems.findIndex(
                  (galleryItem) =>
                    galleryItem.contentPath === meta.contentPath ||
                    galleryItem.id === `work-product-${item.id}` ||
                    galleryItem.id === meta.attachmentId,
                );
                setGalleryIndex(idx >= 0 ? idx : 0);
                setGalleryOpen(true);
              }}
            />
          )}

          {taskChatShellEnabled ? null : attachmentsInitialLoading ? (
            <IssueSectionSkeleton titleWidth="w-24" rows={2} />
          ) : hasAttachments ? (
            <IssueAttachmentsSection
              attachments={attachmentList}
              uploadButton={attachmentUploadButton}
              error={attachmentError}
              dragActive={attachmentDragActive}
              deletePending={deleteAttachment.isPending}
              onDelete={(attachmentId) => deleteAttachment.mutate(attachmentId)}
              onImageClick={(attachment) => {
                const idx = mediaGalleryItems.findIndex(
                  (a) => a.id === attachment.id,
                );
                setGalleryIndex(idx >= 0 ? idx : 0);
                setGalleryOpen(true);
              }}
              onDragEnter={(evt) => {
                evt.preventDefault();
                setAttachmentDragActive(true);
              }}
              onDragOver={(evt) => {
                evt.preventDefault();
                setAttachmentDragActive(true);
              }}
              onDragLeave={(evt) => {
                if (
                  evt.currentTarget.contains(evt.relatedTarget as Node | null)
                )
                  return;
                setAttachmentDragActive(false);
              }}
              onDrop={(evt) => void handleAttachmentDrop(evt)}
            />
          ) : null}

          <ImageGalleryModal
            items={mediaGalleryItems}
            initialIndex={galleryIndex}
            open={galleryOpen}
            onOpenChange={setGalleryOpen}
          />

          {taskChatShellEnabled ? null : (
            <IssueWorkspaceCard
              issue={issue}
              project={resolvedProject}
              onUpdate={(data) => updateIssue.mutate(data)}
              onBrowseFiles={
                fileViewerEnabled
                  ? () => setFileViewerPromptOpen(true)
                  : undefined
              }
              onOpenFileByPath={
                fileViewerEnabled
                  ? () => setFileViewerPromptOpen(true)
                  : undefined
              }
            />
          )}

          {!taskChatShellEnabled &&
            fileViewerEnabled &&
            issue.workProducts &&
            issue.workProducts.length > 0 &&
            (() => {
              const workProductsWithFileRefs = issue.workProducts
                .map((product) => ({
                  product,
                  fileRef: extractWorkspaceFileRefFromWorkProduct(product),
                }))
                .filter(({ fileRef }) => fileRef !== null);

              if (workProductsWithFileRefs.length === 0) return null;

              return (
                <div className="space-y-3">
                  <div className="flex items-center justify-between gap-2">
                    <h3 className="text-sm font-medium text-muted-foreground">
                      Artifacts
                    </h3>
                  </div>
                  <div className="flex flex-wrap gap-2">
                    {workProductsWithFileRefs.map(({ product, fileRef }) => (
                      <ArtifactFileChip
                        key={product.id}
                        workspaceFileRef={fileRef!}
                        title={product.title}
                      />
                    ))}
                  </div>
                </div>
              );
            })()}

          {taskChatShellEnabled ? null : (
            <Separator className={shellSectionClass} />
          )}

          <Tabs
            value={resolvedDetailTab}
            onValueChange={setDetailTab}
            className={
              taskChatShellEnabled
                ? "min-h-0 flex-1"
                : "space-y-3"
            }
          >
            {/* Redesign: the chat IS the page — the Chat/Activity/Related-work tab
            strip is hidden and the thread renders as the only surface. */}
            {taskChatShellEnabled ? null : (
              <TabsList
                variant="line"
                className={cn("w-full justify-start gap-1", shellSectionClass)}
              >
                <TabsTrigger value="chat" className="gap-1.5">
                  <MessageSquare className="h-3.5 w-3.5" />
                  Chat
                </TabsTrigger>
                <TabsTrigger value="activity" className="gap-1.5">
                  <ActivityIcon className="h-3.5 w-3.5" />
                  Activity
                </TabsTrigger>
                <TabsTrigger value="related-work" className="gap-1.5">
                  <ListTree className="h-3.5 w-3.5" />
                  Related work
                </TabsTrigger>
                {issuePluginTabItems.map((item) => (
                  <TabsTrigger key={item.value} value={item.value}>
                    {item.label}
                  </TabsTrigger>
                ))}
              </TabsList>
            )}

            {/* The chat shell keeps the page's responsive 16px/24px gutters so
            thread content and the composer do not touch either sidebar. */}
            <TabsContent
              data-testid="issue-detail-content"
              value="chat"
              className={
                taskChatShellEnabled
                  ? isMobile
                    ? streamlinedTaskDetailEnabled
                      ? "flex min-h-0 flex-1 flex-col"
                      : "-mx-4 flex min-h-0 flex-1 flex-col"
                    : streamlinedTaskDetailEnabled
                      ? "flex min-h-0 flex-col"
                      : "-mx-4 -mt-4 md:-mx-6 md:-mt-6 flex min-h-0 flex-col"
                  : undefined
              }
            >
              {resolvedDetailTab === "chat" ? (
                <WorkspaceBaseRefRecoveryProvider issue={issue} agentMap={agentMap} onRepaired={() => { invalidateIssueDetail(); invalidateIssueCollections(); }}
                  baseRefUnavailableReason={!canManageBoardRuntime ? "You don’t have permission to repair this task’s workspace." : null}
                  unavailableReason={!canResolveBoardRecoveryAction ? "You don’t have permission to retry this task."
                    : treeControlStateError ? "Couldn’t check whether this task is paused. Refresh to try again."
                    : activePauseHold ? "Resume the task before retrying."
                    : issue.project?.pausedAt ? "Resume the project before retrying."
                    : interactions.some(i => i.status === "pending" && !isDeferredConversationInteraction(i)) ? "Respond to the pending question or confirmation before retrying." : null}>
                <DispositionRecoveryProvider value={{
                  issue,
                  agentMap,
                  hasPendingInteraction: interactions.some((interaction) => interaction.status === "pending" && !isDeferredConversationInteraction(interaction)),
                  unavailableReason: boardAccess && !canResolveBoardRecoveryAction
                    ? "You don’t have permission to retry this recovery action."
                    : treeControlStateError
                    ? "Couldn’t check whether this task is paused. Refresh to try again."
                    : activePauseHold
                      ? "The task is paused. Resume it before retrying."
                      : issue.project?.pausedAt
                        ? "The project is paused. Resume it before retrying."
                        : null,
                  onRetry: (actionId) => retryDispositionRecovery.mutateAsync(actionId).then(() => undefined),
                }}>
                <IssueDetailChatTab
                  executionBlocked={Boolean(issue.executionBlocker)}
                  interruption={issue.interruption}
                  retryPreparing={taskRetry.optimistic}
                  queryIssueId={issueId ?? issue.id}
                  hasLiveConnection={hasLiveConnection}
                  onOpenSkill={handleOpenSkill}
                  browsers={browserQuery.data}
                  onOpenBrowser={(id) => { setOpenBrowserId(id); if (isMobile) setMobilePropsOpen(true); else openTaskSidePanel(); }}
                  threadHeader={<>{taskChatThreadHeader}<EmailTaskActivity key={issue.id} companyId={issue.companyId} issueId={issue.id} /></>}
                  issueBrief={
                    // Suppress the seeded-description bubble for the onboarding first
                    // task: its description is agent instructions, not something the
                    // user typed. The user lands on a seeded agent greeting instead.
                    taskChatShellEnabled && !issue.conversationAgentId &&
                    issue.originKind !== ONBOARDING_FIRST_TASK_ORIGIN_KIND
                      ? {
                          description: issue.description ?? "",
                          author: issue.createdByAgentId ? "agent" : "human",
                          authorName: issue.createdByAgentId
                            ? (agentMap.get(issue.createdByAgentId)?.name ??
                              "Agent")
                            : undefined,
                          agent: issue.createdByAgentId ? agentMap.get(issue.createdByAgentId) ?? { id: issue.createdByAgentId } : undefined,
                        agentIcon: issue.createdByAgentId
                            ? agentMap.get(issue.createdByAgentId)?.icon
                            : undefined,
                          createdAt: issue.createdAt,
                          onSave: (description) =>
                            updateIssue.mutateAsync({ description }),
                          mentions: mentionOptions,
                          externalReferences: externalObjectsState.isEnabled
                            ? externalObjectsState.markdownReferences
                            : undefined,
                          imageUploadHandler: async (file) => {
                            const attachment =
                              await uploadAttachment.mutateAsync(file);
                            return attachment.contentPath;
                          },
                          onDropFile: async (file) => {
                            await uploadAttachment.mutateAsync(file);
                          },
                        }
                      : undefined
                  }
                  issueId={conversation && !conversation.issue ? "" : issue.id}
                  companyId={issue.companyId}
                  projectId={issue.projectId ?? null}
                  issueStatus={issue.status}
                  issueAssigneeAgentId={issue.assigneeAgentId}
                  assigneeAdapterOverrides={issue.assigneeAdapterOverrides}
                  issueWorkMode={issue.workMode ?? "standard"}
                  executionRunId={issue.executionRunId ?? null}
                  blockedBy={issue.blockedBy ?? []}
                  liveIssueIds={liveIssueIds}
                  blockerAttention={issue.blockerAttention ?? null}
                  successfulRunHandoff={issue.successfulRunHandoff ?? null}
                  scheduledRetry={issue.scheduledRetry ?? null}
                  recoveryAction={issue.interruption?.responsibility === "system" || issue.activeRecoveryAction?.cause === "native_workspace_finalization_owner_unverified" ? null : issue.activeRecoveryAction ?? null}
                  onResolveRecoveryAction={handleResolveRecoveryAction}
                  onReissueIsolatedRecoveryAction={
                    handleReissueIsolatedRecoveryAction
                  }
                  reissueIsolatedRecoveryActionPending={
                    reissueIsolatedRecoveryAction.isPending
                  }
                  onReconcileForwardRecoveryAction={
                    handleReconcileForwardRecoveryAction
                  }
                  onBreakGlassOverrideRecoveryAction={
                    handleBreakGlassOverrideRecoveryAction
                  }
                  onQuarantineRestoreRecoveryAction={
                    handleQuarantineRestoreRecoveryAction
                  }
                  quarantineRestoreRecoveryActionPending={
                    reconcileRecoveryAction.isPending
                  }
                  canBreakGlassRecoveryAction={canManageBoardRuntime}
                  reconcileRecoveryActionPending={
                    reconcileRecoveryAction.isPending
                  }
                  canFalsePositiveRecoveryAction={canResolveBoardRecoveryAction}
                  legacyRecoverySourceIssue={legacyRecoverySourceIssue}
                  comments={threadComments}
                  commentsInitialLoading={historyExpanded ? commentsLoading : recentComments.isLoading}
                  historyExpanded={historyExpanded}
                  onExpandHistory={expandHistory}
                  hasEarlierMessages={recentComments.data?.hasMore ?? false}
                  initialHistoryPending={linkedCommentPending}
                  initialMetadataPending={
                    interactionsLoading ||
                    attachmentsLoading ||
                    workProductsLoading
                  }
                  initialHistoryError={
                    (historyExpanded ? commentsError : recentComments.isError || linkedComment.isError) ||
                    interactionsError ||
                    attachmentsError ||
                    workProductsError
                  }
                  onRetryInitialHistory={() => {
                    void (historyExpanded ? refetchComments() : recentComments.refetch());
                    if (linkedCommentId && !historyExpanded) void linkedComment.refetch();
                    void refetchInteractions();
                    void refetchAttachments();
                    void refetchWorkProducts();
                  }}
                  locallyQueuedCommentRunIds={locallyQueuedCommentRunIds}
                  interactions={interactions}
                  documents={issue.documentSummaries ?? []}
                  workProducts={workProducts ?? issue.workProducts ?? []}
                  attachments={attachments ?? []}
                  hasOlderComments={paginatedConversation && !historyExpanded
                    ? (earlierChatComments.data ? earlierChatComments.hasNextPage : recentComments.data?.hasMore) ?? false
                    : hasOlderComments}
                  commentsOlderError={paginatedConversation && earlierChatComments.isError}
                  commentsLoadingOlder={paginatedConversation ? earlierChatComments.isFetching : commentsLoadingOlder}
                  onLoadOlderComments={loadOlderComments}
                  onRefreshLatestComments={refetchLatestComments}
                  composerRef={commentComposerRef}
                  composerAccessory={
                    hasVisibleMonitorSurface(issue) ? (
                      <IssueMonitorComposerStrip
                        issue={issue}
                        workProducts={workProducts}
                        checkError={checkIssueMonitorNow.error ? describeError(checkIssueMonitorNow.error, { action: "check the monitor" }).body : null}
                        onCheckNow={() => checkIssueMonitorNow.mutate()}
                        checkingNow={checkIssueMonitorNow.isPending}
                      />
                    ) : null
                  }
                  footer={
                    !taskChatShellEnabled && siblingNavigation ? (
                      <IssueSiblingNavigation
                        navigation={siblingNavigation}
                        linkState={resolvedIssueDetailState ?? location.state}
                      />
                    ) : null
                  }
                  feedbackVotes={feedbackVotes}
                  feedbackDataSharingPreference={feedbackDataSharingPreference}
                  feedbackTermsUrl={FEEDBACK_TERMS_URL}
                  agentMap={agentMap}
                  currentUserId={currentUserId}
                  userLabelMap={userLabelMap}
                  userProfileMap={userProfileMap}
                  draftKey={conversationAgent ? `paperclip:agent-chat-draft:${issue.companyId}:${currentUserId}:${conversationAgent.id}` : `paperclip:issue-comment-draft:${issue.id}`}
                  reassignOptions={commentReassignOptions}
                  currentAssigneeValue={actualAssigneeValue}
                  suggestedAssigneeValue={suggestedAssigneeValue}
                  mentions={mentionOptions}
                  conversationMode={!!issue.conversationAgentId}
                  composerPause={activePauseHold ? {
                    scope: activePauseHold.isRoot && childIssues.length === 0 ? "leaf" : "subtree",
                    pending: executeTreeControl.isPending && executeTreeControl.variables?.mode === "resume",
                    onResume: activePauseHold.isRoot && canManageTreeControl ? () => {
                      executeTreeControl.reset();
                      setTreeControlMode("resume");
                      setTreeControlWakeAgentsOnResume(isAgentOwnedNonTerminalIssue || canShowSubtreeControls);
                      setTreeControlOpen(true);
                    } : undefined,
                    resumeHref: !activePauseHold.isRoot ? createIssueDetailPath(activePauseHoldRoot?.identifier ?? activePauseHold.rootIssueId) : undefined,
                  } : null}
                  composerDisabledReason={issue.conversationAgentId && !instanceExperimentalSettings?.enableAgentChat ? "Agent Chat is disabled in Experimental settings." : treeControlStateError ? "Couldn’t check whether this task is paused. Refresh to try again." : null}
                  composerHint={composerHint}
                  queuedCommentReason={queuedCommentReason}
                  onVote={handleCommentVote}
                  onAdd={handleChatAdd}
                  onImageUpload={handleCommentImageUpload}
                  onAttachImage={handleCommentAttachImage}
                  onInterruptQueued={handleInterruptQueuedRun}
                  onRemoveCommentFromCache={removeCommentFromCache}
                  onDeleteComment={(commentId) =>
                    deleteComment
                      .mutateAsync({ commentId })
                      .then(() => undefined)
                  }
                  onStopResponse={canManageTreeControl
                    ? (runId) => stopResponse.mutateAsync(runId)
                    : undefined}
                  stopResponsePending={stopResponse.isPending}
                  pauseWorkPending={
                    executeTreeControl.isPending &&
                    executeTreeControl.variables?.mode === "pause"
                  }
                  pauseWorkScope={treeControlScope}
                  onPauseWorkRun={
                    canManageTreeControl
                      ? (runId, feedback) =>
                          executeTreeControl
                            .mutateAsync({
                              mode: "pause",
                              feedback,
                              runId,
                              scope: treeControlScope,
                            })
                            .then(() => undefined)
                      : undefined
                  }
                  runFinalizationActions={runFinalizationActions}
                  onWorkModeChange={(nextMode) => {
                    const currentMode: IssueWorkMode =
                      issue.workMode ?? "standard";
                    if (currentMode === nextMode) return;
                    if (conversation && (!conversation.issue || pendingDraftWorkMode.current !== null)) { pendingDraftWorkMode.current = nextMode; setDraftWorkMode(nextMode); return; }
                    return updateIssue
                      .mutateAsync({ workMode: nextMode })
                      .then(() => undefined);
                  }}
                  onCancelQueued={handleCancelQueuedComment}
                  interruptingQueuedRunId={
                    interruptQueuedComment.isPending
                      ? (interruptQueuedComment.variables ?? null)
                      : null
                  }
                  pausingWorkRunId={
                    executeTreeControl.isPending &&
                    executeTreeControl.variables?.mode === "pause"
                      ? (executeTreeControl.variables?.runId ?? null)
                      : null
                  }
                  onImageClick={handleChatImageClick}
                  onAcceptInteraction={handleAcceptInteraction}
                  onRejectInteraction={handleRejectInteraction}
                  onSubmitInteractionAnswers={handleSubmitInteractionAnswers}
                  onCancelInteraction={handleCancelInteraction}
                  onSkipInteraction={handleSkipInteraction}
                  onDismissInteraction={async interaction => { await dismissInteraction.mutateAsync(interaction); }}
                  onSubmitInteractionVerdicts={handleSubmitInteractionVerdicts}
                  assigneeUserId={issue.assigneeUserId ?? null}
                  onResumeFromBacklog={
                    canResumeFromBacklog ? handleResumeFromBacklog : undefined
                  }
                  resumeFromBacklogPending={
                    updateIssue.isPending &&
                    updateIssue.variables?.status === "todo"
                  }
                  onResumeAssignee={
                    issue.assigneeAgentId ? handleResumeAssignee : undefined
                  }
                  resumeAssigneePending={resumeAssigneeAgent.isPending}
                  onTryAgainNoLiveExecutionPath={
                    issue.status === "blocked" && !issue.interruption && issue.activeRecoveryAction
                      ? handleTryAgainNoLiveExecutionPath
                      : undefined
                  }
                  tryAgainNoLiveExecutionPathPending={
                    resolveRecoveryAction.isPending &&
                    resolveRecoveryAction.variables?.sourceIssueStatus ===
                      "todo"
                  }
                  externalReferences={
                    externalObjectsState.isEnabled
                      ? externalObjectsState.markdownReferences
                      : undefined
                  }
                  linkCaseReferences={casesChipsEnabled}
                />
                </DispositionRecoveryProvider>
                </WorkspaceBaseRefRecoveryProvider>
              ) : null}
            </TabsContent>

            <TabsContent value="activity" className={shellSectionClass}>
              {detailTab === "activity" ? (
                <IssueDetailActivityTab
                  issue={issue}
                  issueId={issue.id}
                  companyId={issue.companyId}
                  issueStatus={issue.status}
                  childIssues={childIssues}
                  agentMap={agentMap}
                  hasLiveRuns={hasLiveRuns}
                  currentUserId={currentUserId}
                  userProfileMap={userProfileMap}
                  pendingApprovalAction={pendingApprovalAction}
                  handoffFocusSignal={handoffFocusSignal}
                  onApprovalAction={(approvalId, action) => {
                    approvalDecision.mutate({ approvalId, action });
                  }}
                  externalReferences={
                    externalObjectsState.isEnabled
                      ? externalObjectsState.markdownReferences
                      : undefined
                  }
                />
              ) : null}
            </TabsContent>

            <TabsContent value="related-work" className={shellSectionClass}>
              <IssueRelatedWorkPanel
                relatedWork={issue.relatedWork}
                externalObjectsEnabled={externalObjectsState.isEnabled}
                externalObjects={
                  externalObjectsState.isEnabled
                    ? externalObjectsState.groups
                    : undefined
                }
                externalObjectsLoading={
                  externalObjectsState.isEnabled
                    ? externalObjectsState.isLoading
                    : undefined
                }
                externalObjectsError={
                  externalObjectsState.isEnabled
                    ? externalObjectsState.isError
                    : undefined
                }
                onRetryExternalObjects={
                  externalObjectsState.isEnabled
                    ? externalObjectsState.refetch
                    : undefined
                }
              />
            </TabsContent>

            {activePluginTab && (
              <TabsContent
                value={activePluginTab.value}
                className={shellSectionClass}
              >
                <PluginSlotMount
                  slot={activePluginTab.slot}
                  context={{
                    companyId: issue.companyId,
                    projectId: issue.projectId ?? null,
                    entityId: issue.id,
                    entityType: "issue",
                  }}
                  missingBehavior="placeholder"
                />
              </TabsContent>
            )}
          </Tabs>

          <TaskTreeControlDialog
            open={treeControlOpen}
            onOpenChange={(open) => {
              setTreeControlOpen(open);
              if (!open) executeTreeControl.reset();
            }}
            mode={treeControlMode}
            scope={treeControlScope}
            affectedCount={previewAffectedIssueCount}
            affectedAgentCount={previewAffectedAgentCount}
            warnings={treeControlPreview?.warnings.map((warning) => warning.message)}
            loading={treeControlPreviewLoading}
            error={
              treeControlPreviewError
                ? treeControlPreviewErrorCopy(treeControlPreviewError)
                : executeTreeControl.error
                  ? describeError(executeTreeControl.error).body
                  : undefined
            }
            pending={executeTreeControl.isPending}
            valid={canApplyTreeControl}
            wakeAgents={treeControlWakeAgentsOnResume}
            onWakeAgentsChange={(wake) => {
              executeTreeControl.reset();
              setTreeControlWakeAgentsOnResume(wake);
            }}
            onRetry={() => {
              executeTreeControl.reset();
              void refetchTreeControlPreview();
            }}
            onApply={() =>
              executeTreeControl.mutate({
                mode: treeControlMode,
                scope: treeControlScope,
                wakeAgents: treeControlWakeAgentsOnResume && previewAffectedAgentCount > 0,
              })
            }
          />

          {/* Mobile properties drawer */}
          <Sheet open={mobilePropsOpen} onOpenChange={setMobilePropsOpen}>
            <SheetContent
              side={
                taskChatShellEnabled
                  ? "bottom"
                  : documentDeepLink?.documentKey === "plan"
                    ? "right"
                    : "bottom"
              }
              showCloseButton={!taskChatShellEnabled}
              className={cn(
                taskChatShellEnabled
                  ? "mobile-task-side-panel inset-0 h-dvh max-h-dvh w-full max-w-none gap-0 border-0 p-0 pt-(--sz-safe-top) pb-(--sz-safe-bottom)"
                  : documentDeepLink?.documentKey === "plan"
                    ? "inset-0 h-dvh w-screen max-w-none gap-0 border-0 p-0 sm:max-w-none"
                    : "max-h-(--sz-85dvh) pb-(--sz-safe-bottom)",
              )}
              data-testid={
                taskChatShellEnabled
                  ? "mobile-task-side-panel"
                  : documentDeepLink?.documentKey === "plan"
                    ? "mobile-plan-panel"
                    : undefined
              }
            >
              {taskChatShellEnabled ? (
                <>
                  <SheetHeader className="sr-only">
                    <SheetTitle>Task side panel</SheetTitle>
                  </SheetHeader>
                  <TaskSidePanel
                    pluginPanels={pluginPanels}
                    pluginPanelsLoading={pluginPanelsLoading}
                    openedPluginPanelKeys={openedPluginPanelKeys.current}
                    dismissedPluginPanelKeys={dismissedPluginPanelKeys.current}
                    openBrowserId={openBrowserId}
                    onBrowserOpened={handleBrowserOpened}
                    key={`${issue.id}:mobile`}
                    issue={issue}
                    accountScope={taskPanelAccountScope}
                    childIssues={childIssues}
                    issueLinkState={
                      streamlinedTaskDetailEnabled
                        ? relationIssueLinkState
                        : undefined
                    }
                    onAddSubIssue={openNewSubIssue}
                    onUpdate={(data) => updateIssue.mutate(data)}
                    inline
                    mobile
                    hasActiveRun={resolvedHasActiveRun}
                    externalObjects={
                      externalObjectsState.isEnabled
                        ? externalObjectsState.groups
                        : undefined
                    }
                    externalObjectsLoading={
                      externalObjectsState.isEnabled
                        ? externalObjectsState.isLoading
                        : undefined
                    }
                    externalObjectsError={
                      externalObjectsState.isEnabled
                        ? externalObjectsState.isError
                        : undefined
                    }
                    onRetryExternalObjects={
                      externalObjectsState.isEnabled
                        ? externalObjectsState.refetch
                        : undefined
                    }
                    onCheckMonitorNow={() => checkIssueMonitorNow.mutate()}
                    checkingMonitorNow={checkIssueMonitorNow.isPending}
                    fileTabsEnabled={fileViewerEnabled}
                    streamlinedTabs={streamlinedTaskDetailEnabled}
                    showSubtasksTab={streamlinedTaskDetailEnabled}
                    tasksTab={resolvedTasksTab}
                    artifactsOpenRequestId={isMobile && !artifactsOpenRequest?.handled && artifactsOpenRequest?.issueId === issue.id
                      ? artifactsOpenRequest.requestId : undefined}
                    onArtifactsOpened={handleArtifactsOpened}
                    onAttachmentOpened={handleAttachmentOpened}
                    openAttachment={openAttachment?.issueId === issue.id ? openAttachment : null}
                    openSkillId={openSkill?.id ?? null}
                    openSkillName={openSkill?.name ?? null}
                    onSkillOpened={handleSkillOpened}
                    documentDeepLink={
                      documentDeepLink?.issueId === issue.id
                        ? documentDeepLink
                        : null
                    }
                    onRequestClose={() => setMobilePropsOpen(false)}
                  />
                </>
              ) : (
                <>
                  <SheetHeader>
                    <SheetTitle className="text-sm">
                      {documentDeepLink?.documentKey === "plan"
                        ? "Plan"
                        : "Properties"}
                    </SheetTitle>
                  </SheetHeader>
                  <ScrollArea className="flex-1 overflow-y-auto">
                    <div className="px-4 pb-4">
                      <IssueProperties
                        issue={issue}
                        childIssues={childIssues}
                        issueLinkState={
                          streamlinedTaskDetailEnabled
                            ? relationIssueLinkState
                            : undefined
                        }
                        onAddSubIssue={openNewSubIssue}
                        onUpdate={(data) => updateIssue.mutate(data)}
                        inline
                        hasActiveRun={resolvedHasActiveRun}
                        externalObjects={
                          externalObjectsState.isEnabled
                            ? externalObjectsState.groups
                            : undefined
                        }
                        externalObjectsLoading={
                          externalObjectsState.isEnabled
                            ? externalObjectsState.isLoading
                            : undefined
                        }
                        externalObjectsError={
                          externalObjectsState.isEnabled
                            ? externalObjectsState.isError
                            : undefined
                        }
                        onRetryExternalObjects={
                          externalObjectsState.isEnabled
                            ? externalObjectsState.refetch
                            : undefined
                        }
                        onCheckMonitorNow={() => checkIssueMonitorNow.mutate()}
                        checkingMonitorNow={checkIssueMonitorNow.isPending}
                        documentDeepLink={
                          documentDeepLink?.issueId === issue.id
                            ? documentDeepLink
                            : null
                        }
                      />
                    </div>
                  </ScrollArea>
                </>
              )}
            </SheetContent>
          </Sheet>
          {fileViewerEnabled ? (
            <IssueFileViewer
              issueId={issue.id}
              companyId={issue.companyId}
              promptOpen={fileViewerPromptOpen}
              onPromptOpenChange={setFileViewerPromptOpen}
              useSidePanel={taskChatShellEnabled}
            />
          ) : null}
          <ScrollToBottom />
        </div>
      </IssueGalleryContext.Provider></TextAttachmentContext.Provider>
    </FileViewerProvider>
  );
}

function IssueFileViewer({
  issueId,
  companyId,
  promptOpen,
  onPromptOpenChange,
  useSidePanel = false,
}: {
  issueId: string;
  companyId: string;
  promptOpen: boolean;
  onPromptOpenChange: (next: boolean) => void;
  useSidePanel?: boolean;
}) {
  const viewer = useRequiredFileViewer();

  useEffect(() => {
    if (!useSidePanel || !promptOpen) return;
    viewer.openBrowse();
    onPromptOpenChange(false);
  }, [onPromptOpenChange, promptOpen, useSidePanel, viewer]);

  const open = viewer.state !== null || viewer.browse || promptOpen;
  const showPromptWhenEmpty =
    (promptOpen || viewer.browse) && viewer.state === null;

  useEffect(() => {
    if (useSidePanel) return;
    if (!promptOpen) return;
    if (viewer.state === null && !viewer.browse) return;
    onPromptOpenChange(false);
  }, [
    onPromptOpenChange,
    promptOpen,
    useSidePanel,
    viewer.browse,
    viewer.state,
  ]);

  if (useSidePanel) return null;

  return (
    <FileViewerSheet
      issueId={issueId}
      companyId={companyId}
      open={open}
      showPromptWhenEmpty={showPromptWhenEmpty}
      onOpenChange={(next) => {
        if (!next) {
          onPromptOpenChange(false);
          // Clears any file view and browse state from the URL.
          viewer.close();
        }
      }}
    />
  );
}