fix: reduce store rerenders and cleanup timers

src/features/ecommerce/EcommerceVideoWorkspace.tsx

@@ -121,6 +121,7 @@ export default function EcommerceVideoWorkspace({
   const [previewMedia, setPreviewMedia] = useState<{ url: string; type: "image" | "video" } | null>(null);
   const abortControllerRef = useRef<AbortController | null>(null);
   const renderAbortRef = useRef({ current: false });
+  const actionNoticeTimerRef = useRef<number | null>(null);
   const setView = useAppStore((s) => s.setView);
   const keepaliveRestoredFingerprintRef = useRef<string | null>(null);
   const keepalivePollingStartedRef = useRef(false);
@@ -276,9 +277,23 @@ export default function EcommerceVideoWorkspace({
   // Note: keep-alive is NOT cleared on completion — results persist across page switches.
   // Only cleared when user explicitly starts a new plan via handlePlan.
 
+  useEffect(() => {
+    return () => {
+      if (actionNoticeTimerRef.current !== null) {
+        window.clearTimeout(actionNoticeTimerRef.current);
+      }
+    };
+  }, []);
+
   const showNotice = (msg: string) => {
     setActionNotice(msg);
-    setTimeout(() => setActionNotice(null), 3000);
+    if (actionNoticeTimerRef.current !== null) {
+      window.clearTimeout(actionNoticeTimerRef.current);
+    }
+    actionNoticeTimerRef.current = window.setTimeout(() => {
+      actionNoticeTimerRef.current = null;
+      setActionNotice(null);
+    }, 3000);
   };
 
   const handleDownload = async (url: string) => {