perf(dashboard): slim task list + auto-archive stale done tasks

GET /api/tasks was returning ~69 MB of JSON per call (67.9 MB of agent
logs across 1199 tasks), causing the dashboard to hang for 2+ minutes.

- core: extend listTasks() with slim and includeArchived options
- dashboard: GET /api/tasks now uses slim mode and excludes archived
  by default; ?includeArchived=1 opts in
- frontend: lazy-load archived tasks when the archived column is first
  expanded via new useTasks.loadArchivedTasks()
- engine: self-healing maintenance now auto-archives done tasks older
  than 48h (data stays in SQLite, column flips done -> archived)
- tests: slim mode + includeArchived coverage in store.test.ts;
  routes.test.ts assertion updated for new args

Also bundles in-progress test-setup noise filters and pre-existing
QuickEntryBox/routes test work that was already modified locally.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/dashboard/app/components/Board.tsx

@@ -25,6 +25,8 @@ interface BoardProps {
   onArchiveTask?: (id: string) => Promise<Task>;
   onUnarchiveTask?: (id: string) => Promise<Task>;
   onArchiveAllDone?: () => Promise<Task[]>;
+  /** Lazy-load archived tasks. Called the first time the user expands the archived column. */
+  onLoadArchivedTasks?: () => Promise<void>;
   searchQuery?: string;
   availableModels?: ModelInfo[];
   /**
@@ -62,8 +64,9 @@ function areTaskArraysEqual(previous: Task[], next: Task[]): boolean {
   return previous.every((task, index) => task === next[index]);
 }
 
-export function Board({ tasks, projectId, maxConcurrent, onMoveTask, onOpenDetail, addToast, onQuickCreate, onNewTask, autoMerge, onToggleAutoMerge, globalPaused, onUpdateTask, onArchiveTask, onUnarchiveTask, onArchiveAllDone, searchQuery = "", availableModels, onPlanningMode, onSubtaskBreakdown, onOpenDetailWithTab, favoriteProviders, favoriteModels, onToggleFavorite, onToggleModelFavorite, taskStuckTimeoutMs, onOpenMission }: BoardProps) {
+export function Board({ tasks, projectId, maxConcurrent, onMoveTask, onOpenDetail, addToast, onQuickCreate, onNewTask, autoMerge, onToggleAutoMerge, globalPaused, onUpdateTask, onArchiveTask, onUnarchiveTask, onArchiveAllDone, onLoadArchivedTasks, searchQuery = "", availableModels, onPlanningMode, onSubtaskBreakdown, onOpenDetailWithTab, favoriteProviders, favoriteModels, onToggleFavorite, onToggleModelFavorite, taskStuckTimeoutMs, onOpenMission }: BoardProps) {
   const [archivedCollapsed, setArchivedCollapsed] = useState(true);
+  const archivedLoadedRef = useRef(false);
   const { fetchBatch } = useBatchBadgeFetch(projectId);
   const debounceTimeoutRef = useRef<ReturnType<typeof setTimeout> | null>(null);
   // Normalized search-active signal: trimmed and non-empty
@@ -78,8 +81,15 @@ export function Board({ tasks, projectId, maxConcurrent, onMoveTask, onOpenDetai
   });
 
   const handleToggleArchivedCollapse = useCallback(() => {
-    setArchivedCollapsed((current) => !current);
-  }, []);
+    setArchivedCollapsed((current) => {
+      const next = !current;
+      if (!next && !archivedLoadedRef.current && onLoadArchivedTasks) {
+        archivedLoadedRef.current = true;
+        void onLoadArchivedTasks();
+      }
+      return next;
+    });
+  }, [onLoadArchivedTasks]);
 
   // Tasks are already server-filtered when searchQuery is active (via useTasks hook).
   // Client-side filtering is removed - tasks prop is used directly.

packages/dashboard/app/components/__tests__/QuickEntryBox.test.tsx

@@ -401,7 +401,8 @@ describe("QuickEntryBox", () => {
   });
 
   it("prevents default on Enter key (without Shift)", () => {
-    renderQuickEntryBox({});
+    const onCreate = vi.fn(() => new Promise(() => undefined));
+    renderQuickEntryBox({ onCreate });
     const textarea = screen.getByTestId("quick-entry-input");
 
     fireEvent.change(textarea, { target: { value: "Task" } });
@@ -497,7 +498,9 @@ describe("QuickEntryBox", () => {
     fireEvent.keyDown(textarea, { key: "Enter" });
 
     // Wait a bit to ensure no async call happens
-    await new Promise((resolve) => setTimeout(resolve, 50));
+    await act(async () => {
+      await new Promise((resolve) => setTimeout(resolve, 50));
+    });
 
     expect(props.onCreate).not.toHaveBeenCalled();
   });
@@ -509,7 +512,9 @@ describe("QuickEntryBox", () => {
     fireEvent.change(textarea, { target: { value: "   " } });
     fireEvent.keyDown(textarea, { key: "Enter" });
 
-    await new Promise((resolve) => setTimeout(resolve, 50));
+    await act(async () => {
+      await new Promise((resolve) => setTimeout(resolve, 50));
+    });
 
     expect(props.onCreate).not.toHaveBeenCalled();
   });
@@ -1692,7 +1697,9 @@ describe("QuickEntryBox", () => {
     it("loading state disables button during refinement", async () => {
       const { refineText } = await import("../../api");
       // Slow down the promise to see loading state
-      vi.mocked(refineText).mockImplementation(() => new Promise((resolve) => setTimeout(resolve, 100)));
+      vi.mocked(refineText).mockImplementation(
+        () => new Promise((resolve) => setTimeout(() => resolve("Refined text"), 100)),
+      );
 
       renderQuickEntryBox({});
       expandQuickEntry();