PAP-57: IA Phase 2 — rename user-facing "Issues" → "Tasks" copy

Copy-only sweep across ui/src: nav (sidebar + mobile), Tasks list page
(headings, breadcrumbs, buttons, empty states, filters, column headers,
toasts, aria-labels), task detail, dialogs, command palette, inbox,
search, dashboards, project/agent/workspace pages, recovery/blocked
notices, and design-guide demos.

Routes stay at /issues; internal symbols (Issue, issueId, queryKeys,
kind: "issue"), API fields, and backend-matched protocol strings
(successful-run-handoff notice bodies) are unchanged. Tests updated to
match the new copy. Developer-only *UxLab/*Perf harness pages left as-is.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Co-Authored-By: Paperclip <noreply@paperclip.ing>

ui/src/lib/activity-format.ts

@@ -181,7 +181,7 @@ function formatIssueReferenceLabel(reference: ActivityIssueReference): string {
   if (reference.identifier) return reference.identifier;
   if (reference.title) return reference.title;
   if (reference.id) return reference.id.slice(0, 8);
-  return "issue";
+  return "task";
 }
 
 function formatChangedEntityLabel(
@@ -276,7 +276,7 @@ function formatIssueUpdatedAction(details: ActivityDetails, options: ActivityFor
   }
   if (details.assigneeAgentId !== undefined || details.assigneeUserId !== undefined) {
     const assigneeName = formatAssigneeName(details, options);
-    parts.push(assigneeName ? `assigned the issue to ${assigneeName}` : "unassigned the issue");
+    parts.push(assigneeName ? `assigned the task to ${assigneeName}` : "unassigned the task");
   }
   if (details.title !== undefined) parts.push("updated the title");
   if (details.description !== undefined) parts.push("updated the description");

ui/src/lib/inbox.test.ts

@@ -1274,7 +1274,7 @@ describe("inbox helpers", () => {
 
     expect(groupInboxWorkItems(items, "none")).toEqual([{ key: "__all", label: null, items }]);
     expect(groupInboxWorkItems(items, "type")).toEqual([
-      { key: "issue", label: "Issues", items: [items[1], items[2]] },
+      { key: "issue", label: "Tasks", items: [items[1], items[2]] },
       { key: "approval", label: "Approvals", items: [items[0]] },
       { key: "failed_run", label: "Failed runs", items: [items[3]] },
       { key: "join_request", label: "Join requests", items: [items[4]] },

ui/src/lib/inbox.ts

@@ -821,7 +821,7 @@ const inboxWorkItemKindOrder: InboxWorkItem["kind"][] = [
 ];
 
 const inboxWorkItemKindLabels: Record<InboxWorkItem["kind"], string> = {
-  issue: "Issues",
+  issue: "Tasks",
   approval: "Approvals",
   failed_run: "Failed runs",
   join_request: "Join requests",

ui/src/lib/issueDetailBreadcrumb.ts

@@ -125,13 +125,13 @@ function inferIssueDetailSource(
   if (isIssueDetailSource(state?.issueDetailSource)) return state.issueDetailSource;
   if (!breadcrumb) return null;
   if (breadcrumb.label === "Inbox" || breadcrumb.href.includes("/inbox")) return "inbox";
-  if (breadcrumb.label === "Issues" || breadcrumb.href.includes("/issues")) return "issues";
+  if (breadcrumb.label === "Tasks" || breadcrumb.href.includes("/issues")) return "issues";
   return null;
 }
 
 function breadcrumbForSource(source: IssueDetailSource): IssueDetailBreadcrumb {
   if (source === "inbox") return { label: "Inbox", href: "/inbox" };
-  return { label: "Issues", href: "/issues" };
+  return { label: "Tasks", href: "/issues" };
 }
 
 export function createIssueDetailLocationState(

ui/src/lib/runRetryState.ts

@@ -20,7 +20,7 @@ export type RunRetryStateSummary = {
 
 const RETRY_REASON_LABELS: Record<string, string> = {
   transient_failure: "Transient failure",
-  missing_issue_comment: "Missing issue comment",
+  missing_issue_comment: "Missing task comment",
   process_lost: "Process lost",
   assignment_recovery: "Assignment recovery",
   issue_continuation_needed: "Continuation needed",

ui/src/lib/system-notice-comment.ts

@@ -37,11 +37,11 @@ function mapMetadataRow(
     case "issue_link": {
       const identifier = row.identifier ?? null;
       if (!identifier) {
-        return { kind: "text", label: metadataRowText(row, "Issue"), value: row.title ?? "unknown" };
+        return { kind: "text", label: metadataRowText(row, "Task"), value: row.title ?? "unknown" };
       }
       return {
         kind: "issue",
-        label: metadataRowText(row, "Issue"),
+        label: metadataRowText(row, "Task"),
         identifier,
         href: `/issues/${identifier}`,
         title: row.title ?? undefined,