PaperClipAI/ui/src/components/Layout.production.tsx

import { useDesignSandbox } from "@/context/DesignSandboxContext";
import { DesignSandboxSidebar } from "./DesignSandboxSidebar";
import { BoardDialogs } from "./BoardDialogs";
import { ChatSetupSidebarProvider } from "@/context/ChatSetupSidebarContext";
import { PluginAppShellOverlays } from "./PluginAppShellOverlays";
import {
  useCallback,
  useEffect,
  useLayoutEffect,
  useMemo,
  useRef,
  useState,
  type CSSProperties,
} from "react";
import { useQuery } from "@tanstack/react-query";
import {
  Outlet,
  useLocation,
  useNavigate,
  useNavigationType,
  useParams,
} from "@/lib/router";
import { Sidebar } from "./Sidebar.production";
import { CompanySettingsSidebar } from "./CompanySettingsSidebar.production";
import { CompanySettingsNav } from "./access/CompanySettingsNav";
import { AppsSidebar } from "./AppsSidebar.production";
import { AppDetailSidebar } from "./AppConnectionSidebar.production";
import { BreadcrumbBar } from "./BreadcrumbBar.production";
import { PropertiesPanel } from "./PropertiesPanel";
import { CommandPalette } from "./CommandPalette";
import { KeyboardShortcutsCheatsheet } from "./KeyboardShortcutsCheatsheet";
import { ToastViewport } from "./ToastViewport";
import { MobileBottomNav } from "./MobileBottomNav";
import { WorktreeBanner } from "./WorktreeBanner";
import { DevRestartBanner } from "./DevRestartBanner";
import { StandaloneBrowserControls } from "./StandaloneBrowserControls";
import { RouteErrorBoundary } from "./RouteErrorBoundary";
import { SidebarShell } from "./SidebarShell.production";
import { SecondarySidebar } from "./SecondarySidebar.production";
import { SidebarAccountMenu } from "./SidebarAccountMenu.production";
import { useDialogActions } from "../context/DialogContext";
import { usePanel } from "../context/PanelContext";
import { useCompany } from "../context/CompanyContext";
import { useSidebar } from "../context/SidebarContext";
import { useKeyboardShortcuts } from "../hooks/useKeyboardShortcuts";
import { useCompanyPageMemory } from "../hooks/useCompanyPageMemory";
import { useMobileNavVisibility } from "../hooks/useMobileNavVisibility";
import { useMobileVisualViewport } from "../hooks/useMobileVisualViewport";
import { healthApi } from "../api/health";
import {
  resolveArchivedCompanyBounce,
  shouldSyncCompanySelectionFromRoute,
} from "../lib/company-selection";
import { useOptionalToastActions } from "../context/ToastContext";
import {
  applyMainContentScrollTop,
  NavigationScrollMemory,
  resetNavigationScroll,
  shouldResetScrollOnNavigation,
} from "../lib/navigation-scroll";
import { queryKeys } from "../lib/queryKeys";
import { scheduleMainContentFocus } from "../lib/main-content-focus";
import { pinDocumentScrollToZero } from "../lib/pin-document-scroll";
import { cn } from "../lib/utils";
import { classifyShellRoute } from "../lib/shell-navigation";
import { NotFoundPage } from "../pages/NotFound";
import {
  PluginSlotMount,
  resolveRouteSidebarSlot,
  usePluginSlots,
} from "../plugins/slots";

function getCompanyRouteSegment(
  pathname: string,
  companyPrefix: string | undefined,
): string | null {
  return (
    getCompanyPathSegments(pathname, companyPrefix)[0]?.toLowerCase() ?? null
  );
}

function getCompanyPathSegments(
  pathname: string,
  companyPrefix: string | undefined,
): string[] {
  if (!companyPrefix) return [];
  const segments = pathname.split("/").filter(Boolean);
  if (segments.length < 2) return [];
  if (segments[0]?.toUpperCase() !== companyPrefix.toUpperCase()) return [];
  return segments.slice(1);
}

const RESERVED_APP_SUBPATHS = new Set([
  "browse",
  "connections",
  "connect",
  "chat",
  "review",
  "attention",
  "gateways",
  "advanced",
  "app",
]);

function isSkillsStoreRoute(
  pathname: string,
  companyPrefix: string | undefined,
) {
  const segments = pathname.split("/").filter(Boolean);
  if (segments[0]?.toLowerCase() === "skills") return true;
  if (!companyPrefix) return false;
  return (
    segments[0]?.toUpperCase() === companyPrefix.toUpperCase() &&
    segments[1]?.toLowerCase() === "skills"
  );
}

export function Layout() {
  const designSandbox = useDesignSandbox();
  const {
    sidebarOpen,
    setSidebarOpen,
    toggleSidebar,
    collapsed,
    peeking,
    setPeeking,
    isMobile,
    setForceCollapsed,
  } = useSidebar();
  const { openNewIssue, openOnboarding } = useDialogActions();
  const { togglePanelVisible } = usePanel();
  // Optional: Layout also renders in harnesses without a ToastProvider.
  const pushToast = useOptionalToastActions()?.pushToast ?? null;
  const {
    companies,
    loading: companiesLoading,
    selectedCompany,
    selectedCompanyId,
    selectionSource,
    setSelectedCompanyId,
  } = useCompany();
  const { companyPrefix, pluginRoutePath: matchedPluginRoutePath } = useParams<{
    companyPrefix: string;
    pluginRoutePath?: string;
  }>();
  const navigate = useNavigate();
  const location = useLocation();
  const navigationType = useNavigationType();
  const isTaskDetailRoute = classifyShellRoute(location.pathname, companyPrefix).isTaskDetail;
  const isCompanySettingsRoute = [
    "/company/settings",
    "/company/export",
    "/company/import",
  ].some((settingsPath) => location.pathname.includes(settingsPath));
  const companyPathSegments = getCompanyPathSegments(
    location.pathname,
    companyPrefix,
  );
  const isToolsRoute = companyPathSegments[0]?.toLowerCase() === "tools";
  const isAppsRoute = companyPathSegments[0]?.toLowerCase() === "apps";
  const appDetailConnectionId =
    isAppsRoute &&
    companyPathSegments[1] &&
    !RESERVED_APP_SUBPATHS.has(companyPathSegments[1].toLowerCase())
      ? companyPathSegments[1]
      : null;
  const appDetailApplicationId =
    isAppsRoute &&
    companyPathSegments[1]?.toLowerCase() === "app" &&
    companyPathSegments[2]
      ? companyPathSegments[2]
      : null;
  // The Skills Store renders its own secondary (category) sidebar, so the main
  // app nav collapses to its rail throughout the Skills Store section (PAP-10879).
  const isSkillsRoute = isSkillsStoreRoute(location.pathname, companyPrefix);
  const onboardingTriggered = useRef(false);
  const previousPathname = useRef<string | null>(null);
  const mainContentRef = useRef<HTMLElement | null>(null);
  const scrollMemory = useRef(new NavigationScrollMemory());
  const activeScrollKey = useRef<string>(location.key);
  const mobileNavVisible = useMobileNavVisibility(isMobile, location.pathname);
  const mobileViewportRef = useMobileVisualViewport(isMobile);
  const [shortcutsOpen, setShortcutsOpen] = useState(false);
  const matchedCompany = useMemo(() => {
    if (!companyPrefix) return null;
    const requestedPrefix = companyPrefix.toUpperCase();
    return (
      companies.find(
        (company) => company.issuePrefix.toUpperCase() === requestedPrefix,
      ) ?? null
    );
  }, [companies, companyPrefix]);
  const hasUnknownCompanyPrefix =
    Boolean(companyPrefix) &&
    !companiesLoading &&
    companies.length > 0 &&
    !matchedCompany;
  const pluginRoutePath = useMemo(
    () =>
      matchedPluginRoutePath?.toLowerCase() ??
      getCompanyRouteSegment(location.pathname, companyPrefix),
    [companyPrefix, location.pathname, matchedPluginRoutePath],
  );
  const routeSidebarCompanyId = matchedCompany?.id ?? null;
  const routeSidebarCompanyPrefix = matchedCompany?.issuePrefix ?? null;
  const { slots: routeSidebarSlots } = usePluginSlots({
    slotTypes: ["page", "routeSidebar"],
    companyId: routeSidebarCompanyId,
    enabled: Boolean(routeSidebarCompanyId && pluginRoutePath),
  });
  const routeSidebarSlot = useMemo(
    () => resolveRouteSidebarSlot(routeSidebarSlots, pluginRoutePath),
    [pluginRoutePath, routeSidebarSlots],
  );
  const sidebarContext = useMemo(
    () => ({
      companyId: routeSidebarCompanyId,
      companyPrefix: routeSidebarCompanyPrefix,
    }),
    [routeSidebarCompanyId, routeSidebarCompanyPrefix],
  );
  // Takeover routes (company settings, plugin `routeSidebar`) no longer replace
  // the app `<Sidebar/>`. Instead the host collapses it to its rail and renders
  // the contextual sidebar in a second pane (PAP-10695). One resolver drives
  // both desktop (SecondarySidebar) and mobile (off-canvas drawer).
  const secondarySidebar = isCompanySettingsRoute ? (
    <CompanySettingsSidebar />
  ) : appDetailConnectionId ? (
    <AppDetailSidebar kind="connection" connectionId={appDetailConnectionId} />
  ) : appDetailApplicationId ? (
    <AppDetailSidebar
      kind="application"
      applicationId={appDetailApplicationId}
    />
  ) : isAppsRoute || isToolsRoute ? (
    <AppsSidebar />
  ) : routeSidebarSlot ? (
    <PluginSlotMount
      slot={routeSidebarSlot}
      context={sidebarContext}
      className="h-full w-full"
      missingBehavior="placeholder"
    />
  ) : null;
  const hasSecondarySidebar = secondarySidebar != null;
  const { data: health } = useQuery({
    queryKey: queryKeys.health,
    queryFn: () => healthApi.get(),
    refetchInterval: (query) => {
      const data = query.state.data as
        { devServer?: { enabled?: boolean } } | undefined;
      return data?.devServer?.enabled ? 2000 : false;
    },
    refetchIntervalInBackground: false,
  });

  // A secondary sidebar always collapses the app sidebar to its rail (still
  // peek-able) — a hard invariant that overrides the user pin while the route
  // is active, but does NOT mutate the persisted preference. Clearing the force
  // on cleanup restores the user's expanded/collapsed choice when navigating
  // off the takeover route (PAP-10694).
  const forceRailCollapsed = hasSecondarySidebar || isSkillsRoute;
  useLayoutEffect(() => {
    setForceCollapsed(forceRailCollapsed);
    return () => setForceCollapsed(false);
  }, [forceRailCollapsed, setForceCollapsed]);

  useEffect(() => {
    if (companiesLoading || onboardingTriggered.current) return;
    if (health?.deploymentMode === "authenticated") return;
    // Cloud provisions the single company for a stack, and POST /companies is a
    // 403 floor there — auto-opening the wizard could only dead-end.
    if (health?.cloud) return;
    if (companies.length === 0) {
      onboardingTriggered.current = true;
      openOnboarding();
    }
  }, [
    companies,
    companiesLoading,
    openOnboarding,
    health?.cloud,
    health?.deploymentMode,
  ]);

  useEffect(() => {
    if (!companyPrefix || companiesLoading || companies.length === 0) return;

    if (!matchedCompany) {
      const fallback =
        (selectedCompanyId
          ? companies.find((company) => company.id === selectedCompanyId)
          : null) ??
        companies[0] ??
        null;
      if (fallback && selectedCompanyId !== fallback.id) {
        setSelectedCompanyId(fallback.id, { source: "route_sync" });
      }
      return;
    }

    if (companyPrefix !== matchedCompany.issuePrefix) {
      const suffix = location.pathname.replace(/^\/[^/]+/, "");
      navigate(`/${matchedCompany.issuePrefix}${suffix}${location.search}`, {
        replace: true,
      });
      return;
    }

    // Stale state (remembered paths, history, bookmarks, restored tabs)
    // deposits users into archived companies long after archiving; a cold
    // arrival bounces to an active company instead of dwelling there.
    // Deliberate visits (the company is already the selection) stay put.
    const bounce = resolveArchivedCompanyBounce({
      matchedCompany,
      selectedCompanyId,
      companies,
    });
    if (bounce) {
      pushToast?.({
        title: `${matchedCompany.name} is archived`,
        body: `Switched to ${bounce.name}.`,
        tone: "info",
        dedupeKey: `archived-company-bounce:${matchedCompany.id}`,
      });
      setSelectedCompanyId(bounce.id, { source: "route_sync" });
      navigate(`/${bounce.issuePrefix}/dashboard`, { replace: true });
      return;
    }

    if (
      shouldSyncCompanySelectionFromRoute({
        selectionSource,
        selectedCompanyId,
        routeCompanyId: matchedCompany.id,
      })
    ) {
      setSelectedCompanyId(matchedCompany.id, { source: "route_sync" });
    }
  }, [
    companyPrefix,
    companies,
    companiesLoading,
    matchedCompany,
    location.pathname,
    location.search,
    navigate,
    pushToast,
    selectionSource,
    selectedCompanyId,
    setSelectedCompanyId,
  ]);

  const togglePanel = togglePanelVisible;
  const openSearch = useCallback(() => {
    document.dispatchEvent(
      new KeyboardEvent("keydown", {
        key: "k",
        metaKey: true,
        bubbles: true,
        cancelable: true,
      }),
    );
  }, []);

  // Peek (hover flyout) triggers for the collapsed rail. Opening has a tiny
  // delay so a pointer merely sweeping across the rail doesn't flash it open;
  // closing is debounced to avoid flicker on the rail→overlay seam. Keyboard
  // focus opens immediately so tabbing reaches the full nav. Context gates the
  // effective `peeking` to desktop + collapsed + hover-capable pointers, so
  // these handlers are inert otherwise.
  const peekTimer = useRef<number | null>(null);
  // Whether the pointer is currently over the peek panel. Used to keep the peek
  // open across focus changes (e.g. navigation steals focus to <main>) as long as
  // the user is still hovering — it should only close when they actually mouse off
  // (PAP-10676).
  const pointerInsidePanel = useRef(false);
  // When the user explicitly collapses while the pointer is still over the panel,
  // suppress re-peeking until the pointer actually leaves — otherwise the lingering
  // hover immediately re-expands the rail and the collapse "doesn't take" until the
  // mouse moves away (PAP-10676). Re-armed on the next genuine pointer-leave.
  const suppressPeekRef = useRef(false);
  const clearPeekTimer = useCallback(() => {
    if (peekTimer.current !== null) {
      window.clearTimeout(peekTimer.current);
      peekTimer.current = null;
    }
  }, []);
  const openPeek = useCallback(() => {
    clearPeekTimer();
    peekTimer.current = window.setTimeout(() => setPeeking(true), 50);
  }, [clearPeekTimer, setPeeking]);
  const openPeekImmediate = useCallback(() => {
    clearPeekTimer();
    setPeeking(true);
  }, [clearPeekTimer, setPeeking]);
  const closePeek = useCallback(() => {
    clearPeekTimer();
    peekTimer.current = window.setTimeout(() => setPeeking(false), 120);
  }, [clearPeekTimer, setPeeking]);
  // Tracked even while expanded so that, at the moment of collapse, we know
  // whether the pointer is over the panel and should suppress the re-peek.
  const handlePanelPointerEnter = useCallback(() => {
    pointerInsidePanel.current = true;
    if (collapsed && !suppressPeekRef.current) openPeek();
  }, [collapsed, openPeek]);
  const handlePanelPointerLeave = useCallback(() => {
    pointerInsidePanel.current = false;
    suppressPeekRef.current = false; // pointer left — re-arm peek for the next hover
    closePeek();
  }, [closePeek]);
  const handlePanelFocus = useCallback(() => {
    if (suppressPeekRef.current) return;
    openPeekImmediate();
  }, [openPeekImmediate]);
  // Close on focus leaving the panel only when the pointer isn't hovering it.
  // Clicking a rail/peek nav item moves focus to <main> on navigation; if the
  // mouse is still over the flyout we keep it open until the pointer leaves.
  const handlePanelBlur = useCallback(() => {
    if (pointerInsidePanel.current) return;
    closePeek();
  }, [closePeek]);

  // Tidy up any pending peek timer on unmount.
  useEffect(() => clearPeekTimer, [clearPeekTimer]);

  // An explicit collapse must be atomic: cancel any in-flight/active peek, and if
  // the pointer is still over the panel suppress re-peeking until it leaves, so the
  // rail doesn't immediately re-expand under the lingering hover (PAP-10676).
  const wasCollapsed = useRef(collapsed);
  useEffect(() => {
    if (collapsed !== wasCollapsed.current) {
      if (collapsed) {
        clearPeekTimer();
        setPeeking(false);
        suppressPeekRef.current = pointerInsidePanel.current;
      } else {
        suppressPeekRef.current = false;
      }
      wasCollapsed.current = collapsed;
    }
  }, [collapsed, clearPeekTimer, setPeeking]);

  // Intentionally do NOT close the peek on navigation: clicking a nav item means
  // the pointer is still over the flyout, so it should stay open until the user
  // actually mouses off (handled by onPanelMouseLeave) or blurs out / hits Escape
  // (PAP-10676). Auto-closing here made the sidebar collapse on every page change.

  // Escape closes an open peek without trapping the pointer.
  useEffect(() => {
    if (!peeking) return;
    const onKeyDown = (event: KeyboardEvent) => {
      if (event.key === "Escape") {
        clearPeekTimer();
        setPeeking(false);
      }
    };
    window.addEventListener("keydown", onKeyDown);
    return () => window.removeEventListener("keydown", onKeyDown);
  }, [peeking, clearPeekTimer, setPeeking]);

  useCompanyPageMemory();

  useKeyboardShortcuts({
    onNewIssue: () => openNewIssue(),
    onSearch: openSearch,
    onToggleSidebar: toggleSidebar,
    onTogglePanel: togglePanel,
    onShowShortcuts: () => setShortcutsOpen(true),
    onGoToInbox: () => navigate("/inbox"),
  });

  // Swipe gesture to open/close sidebar on mobile
  useEffect(() => {
    if (!isMobile) return;

    const EDGE_ZONE = 30; // px from left edge to start open-swipe
    const MIN_DISTANCE = 50; // minimum horizontal swipe distance
    const MAX_VERTICAL = 75; // max vertical drift before we ignore

    let startX = 0;
    let startY = 0;

    const onTouchStart = (e: TouchEvent) => {
      const t = e.touches[0]!;
      startX = t.clientX;
      startY = t.clientY;
    };

    const onTouchEnd = (e: TouchEvent) => {
      const t = e.changedTouches[0]!;
      const dx = t.clientX - startX;
      const dy = Math.abs(t.clientY - startY);

      if (dy > MAX_VERTICAL) return; // vertical scroll, ignore

      // Swipe right from left edge → open
      if (!sidebarOpen && startX < EDGE_ZONE && dx > MIN_DISTANCE) {
        setSidebarOpen(true);
        return;
      }

      // Swipe left when open → close
      if (sidebarOpen && dx < -MIN_DISTANCE) {
        setSidebarOpen(false);
      }
    };

    document.addEventListener("touchstart", onTouchStart, { passive: true });
    document.addEventListener("touchend", onTouchEnd, { passive: true });

    return () => {
      document.removeEventListener("touchstart", onTouchStart);
      document.removeEventListener("touchend", onTouchEnd);
    };
  }, [isMobile, sidebarOpen, setSidebarOpen]);

  useEffect(() => {
    const previousOverflow = document.body.style.overflow;

    document.body.style.overflow = isMobile ? "visible" : "clip";

    return () => {
      document.body.style.overflow = previousOverflow;
    };
  }, [isMobile]);

  // `scrollIntoView` walks every ancestor scroll container. On a long thread
  // the post-submit `scrollIntoView` on the new comment reaches `<html>` and
  // animates `documentElement.scrollTop` via the browser's internal scroll
  // algorithm, which bypasses the CSS `overflow` on the root element and
  // visually shifts the entire shell (sidebar included) off-screen. Pin
  // both roots to scrollTop=0 on every scroll tick.
  useEffect(() => {
    if (isMobile) return;
    return pinDocumentScrollToZero();
  }, [isMobile]);

  useEffect(() => {
    if (typeof document === "undefined") return;
    const mainContent = mainContentRef.current;
    return scheduleMainContentFocus(mainContent);
  }, [location.pathname]);

  // Continuously record the scroll offset of the active history entry so a
  // later back/forward navigation can restore it (see NavigationScrollMemory).
  useEffect(() => {
    const main = mainContentRef.current;
    if (!main) return;
    const recordScroll = () => {
      scrollMemory.current.remember(activeScrollKey.current, main.scrollTop);
    };
    main.addEventListener("scroll", recordScroll, { passive: true });
    return () => main.removeEventListener("scroll", recordScroll);
  }, []);

  useLayoutEffect(() => {
    const main = mainContentRef.current;
    const shouldResetScroll = shouldResetScrollOnNavigation({
      previousPathname: previousPathname.current,
      pathname: location.pathname,
      navigationType,
      state: location.state,
    });

    previousPathname.current = location.pathname;

    const isHistoryPop = navigationType === "POP";
    const restoredScrollTop = isHistoryPop
      ? scrollMemory.current.recall(location.key)
      : 0;
    activeScrollKey.current = location.key;

    if (isHistoryPop) {
      applyMainContentScrollTop(main, restoredScrollTop);
      // Cached page content can finish laying out a frame after commit; re-apply
      // once it has so the restored offset isn't clamped to a shorter interim height.
      const raf = requestAnimationFrame(() =>
        applyMainContentScrollTop(main, restoredScrollTop),
      );
      return () => cancelAnimationFrame(raf);
    }

    if (shouldResetScroll) {
      resetNavigationScroll(main);
    }
  }, [location.key, location.pathname, location.state, navigationType]);

  return (
    <ChatSetupSidebarProvider>
      <div
        ref={mobileViewportRef}
        data-mobile={isMobile ? "true" : undefined}
        className={cn(
          "paperclip-app-shell bg-background text-foreground pt-(--sz-safe-top)",
          // overflow-x-clip on mobile keeps a stray wide descendant from making the
          // whole viewport scroll horizontally. clip (not hidden) leaves overflow-y
          // computed as visible, so native body scroll + the sticky breadcrumb keep
          // working.
          isMobile
            ? "min-h-dvh overflow-x-clip"
            : "flex h-dvh flex-col overflow-clip",
        )}
      >
        <a
          href="#main-content"
          className="sr-only focus:not-sr-only focus:fixed focus:left-3 focus:top-3 focus:z-(--z-200) focus:rounded-md focus:bg-background focus:px-3 focus:py-2 focus:text-sm focus:font-medium focus:shadow-lg focus:outline-none focus-visible:ring-2 focus-visible:ring-ring"
        >
          Skip to Main Content
        </a>
        <WorktreeBanner />
        <DevRestartBanner devServer={health?.devServer} />
        <div
          className={cn(
            "app-main-row min-h-0 flex-1",
            isMobile ? "w-full" : "flex overflow-clip",
          )}
        >
          {isMobile && sidebarOpen && (
            <button
              type="button"
              className="fixed inset-0 z-40 bg-black/50"
              onClick={() => setSidebarOpen(false)}
              aria-label="Close sidebar"
            />
          )}

          {isMobile ? (
            <div
              className={cn(
                "fixed inset-y-0 left-0 z-50 flex flex-col overflow-hidden pt-(--sz-safe-top) transition-transform duration-100 ease-out",
                sidebarOpen ? "translate-x-0" : "-translate-x-full",
              )}
            >
              <div className="flex flex-1 min-h-0 overflow-hidden">
                <div className="w-60 shrink-0 overflow-hidden">
                  {hasSecondarySidebar ? secondarySidebar : <Sidebar />}
                </div>
              </div>
              <SidebarAccountMenu deploymentMode={health?.deploymentMode} />
            </div>
          ) : (
            <SidebarShell
              open={sidebarOpen}
              collapsed={designSandbox ? false : collapsed}
              peeking={designSandbox ? false : peeking}
              resizable
              storageKey={designSandbox ? "paperclip.design-proposals.sandbox.sidebar-width" : undefined}
              onPanelMouseEnter={handlePanelPointerEnter}
              onPanelMouseLeave={handlePanelPointerLeave}
              onPanelFocusCapture={collapsed ? handlePanelFocus : undefined}
              onPanelBlurCapture={collapsed ? handlePanelBlur : undefined}
            >
              {designSandbox ? <DesignSandboxSidebar /> : <>
                <div className="flex flex-1 min-h-0">
                  <Sidebar />
                </div>
                <SidebarAccountMenu deploymentMode={health?.deploymentMode} />
              </>}
            </SidebarShell>
          )}

          {!isMobile && hasSecondarySidebar ? (
            <SecondarySidebar>{secondarySidebar}</SecondarySidebar>
          ) : null}

          <div
            className={cn(
              "app-content-column flex min-w-0 flex-col",
              isMobile ? "w-full" : "h-full flex-1",
            )}
          >
            <div
              className={cn(
                "app-breadcrumb",
                isMobile &&
                  "sticky top-0 z-20 bg-background/95 backdrop-blur supports-[backdrop-filter]:bg-background/85",
              )}
            >
              <StandaloneBrowserControls mobile={isMobile} />
              <BreadcrumbBar />
              {isMobile && isCompanySettingsRoute ? (
                <div className="border-b border-border px-4 pb-3">
                  <CompanySettingsNav />
                </div>
              ) : null}
            </div>
            <div className={cn("app-content-row", isMobile ? "block" : "flex flex-1 min-h-0")}>
              <main
                id="main-content"
                ref={mainContentRef}
                tabIndex={-1}
                // Publish the pinned-composer bottom offset to descendants
                // (PAP-495): while the auto-hiding mobile nav is on screen, raise
                // it to the nav height so a sticky composer clears the nav; drop
                // it back to the safe-area dock when the nav hides. Desktop leaves
                // the token at its :root default.
                style={
                  isMobile
                    ? ({
                      "--tc-composer-bottom": mobileNavVisible
                          ? "var(--tc-composer-visible-nav-offset)"
                          : "var(--sz-calc-8)",
                      "--mobile-nav-motion-duration": mobileNavVisible
                          ? "var(--motion-mobile-nav-enter)"
                          : "var(--motion-mobile-nav-exit)",
                      "--mobile-nav-motion-ease": mobileNavVisible
                          ? "var(--motion-ease-out-expo)"
                          : "var(--motion-ease-standard)",
                      } as CSSProperties)
                    : undefined
                }
                className={cn(
                  "flex-1 p-4 outline-none md:p-6",
                  // Reserve the scrollbar gutter on desktop so pages whose height
                  // changes (e.g. switching skill-detail tabs) don't widen/shift
                  // when the vertical scrollbar appears or disappears (PAP-10907).
                  isMobile
                    ? isTaskDetailRoute
                      ? "overflow-visible pb-(--tc-composer-visible-nav-offset)"
                      : "overflow-visible pb-(--sz-calc-14)"
                    : "overflow-auto [scrollbar-gutter:stable]",
                )}
              >
                {hasUnknownCompanyPrefix ? (
                  <NotFoundPage
                    scope="invalid_company_prefix"
                    requestedPrefix={
                      companyPrefix ?? selectedCompany?.issuePrefix
                    }
                  />
                ) : (
                  <RouteErrorBoundary>
                    <Outlet />
                  </RouteErrorBoundary>
                )}
              </main>
              <PropertiesPanel />
            </div>
          </div>
        </div>
        {isMobile && <MobileBottomNav visible={mobileNavVisible} />}
        <CommandPalette />
        <BoardDialogs />
        <KeyboardShortcutsCheatsheet
          open={shortcutsOpen}
          onOpenChange={setShortcutsOpen}
        />
        <ToastViewport />
        <PluginAppShellOverlays localTrusted={health?.deploymentMode === "local_trusted"} />
      </div>
    </ChatSetupSidebarProvider>
  );
}