fix(sessions): centralize global polling

packages/ui/src/App.tsx

@@ -11,6 +11,7 @@ import { ErrorBoundary } from '@/components/ui/ErrorBoundary';
 import { useMenuActions } from '@/hooks/useMenuActions';
 import { useSessionStatusBootstrap } from '@/hooks/useSessionStatusBootstrap';
 import { useTraySync } from '@/hooks/useTraySync';
+import { useGlobalSessionsPolling } from '@/hooks/useGlobalSessionsPolling';
 import { useRouter } from '@/hooks/useRouter';
 import { usePushVisibilityBeacon } from '@/hooks/usePushVisibilityBeacon';
 import { useWebNotificationStream } from '@/hooks/useWebNotificationStream';
@@ -719,6 +720,7 @@ function App({ apis }: AppProps) {
   useMenuActions(handleToggleMemoryDebug);
 
   useTraySync();
+  useGlobalSessionsPolling(!embeddedSessionChat);
 
   useSessionStatusBootstrap({ enabled: embeddedBackgroundWorkEnabled });