fix(FN-2098): align no-task heartbeat guidance and stabilize flaky tests

- Update HEARTBEAT_NO_TASK_SYSTEM_PROMPT copy to emphasize inbox, memory, delegation, and heartbeat_done usage
- Expand heartbeat monitor tests to assert no-task prompt/tool alignment and preserve task-scoped prompt behavior
- Harden first-run and App view tests by using a safe cwd fallback and more robust async UI waits
- Add best-effort dashboard performance reporting hooks in App and useProjects via a new reportDashboardPerf API helper

packages/dashboard/app/hooks/useProjects.ts

@@ -3,6 +3,7 @@ import type { ProjectInfo } from "../api";
 import {
   fetchProjectsAcrossNodes,
   registerProject,
+  reportDashboardPerf,
   unregisterProject,
   updateProject,
   type ProjectCreateInput,
@@ -59,13 +60,22 @@ export function useProjects(): UseProjectsResult {
 
     async function load() {
       setLoading(true);
+      const t0 = performance.now();
       try {
         const data = await fetchProjectsAcrossNodes();
+        const elapsed = Math.round(performance.now() - t0);
+        const msg = `initial fetchProjectsAcrossNodes took ${elapsed}ms (${data.length} projects)`;
+        console.log(`[useProjects] ${msg}`);
+        reportDashboardPerf("[useProjects]", msg);
         if (!cancelled) {
           setProjects(data);
           setError(null);
         }
       } catch (err) {
+        const elapsed = Math.round(performance.now() - t0);
+        const msg = `initial fetch failed after ${elapsed}ms: ${err instanceof Error ? err.message : String(err)}`;
+        console.warn(`[useProjects] ${msg}`);
+        reportDashboardPerf("[useProjects]", msg);
         if (!cancelled) {
           setError(err instanceof Error ? err.message : "Failed to fetch projects");
         }