diff --git a/src/frontend/src/App.tsx b/src/frontend/src/App.tsx
index 44216b5..356e3da 100644
--- a/src/frontend/src/App.tsx
+++ b/src/frontend/src/App.tsx
@@ -31,10 +31,21 @@ export default function App() {
   const projects = useStore((s) => s.projects);
   const selectedProjectId = useStore((s) => s.selectedProjectId);
   const setSelectedProjectId = useStore((s) => s.setSelectedProjectId);
+  const v2tasksLoading = useStore((s) => s.v2tasksLoading);
 
   useEffect(() => {
     startPolling();
-    return () => stopPolling();
+    // P1: 活跃度追踪
+    const onActivity = () => { (window as any).__markActivity?.(); };
+    window.addEventListener('mousemove', onActivity);
+    window.addEventListener('keydown', onActivity);
+    window.addEventListener('click', onActivity);
+    return () => {
+      stopPolling();
+      window.removeEventListener('mousemove', onActivity);
+      window.removeEventListener('keydown', onActivity);
+      window.removeEventListener('click', onActivity);
+    };
   }, []);
 
   // ⌘K / Ctrl+K 全局搜索