Add subcription level filtering

frontend/src/App.tsx

@@ -9,6 +9,7 @@ import { AppRouter } from './router/AppRouter';
 import { ThemeProvider } from './contexts/ThemeContext';
 import { AuthProvider } from './contexts/AuthContext';
 import { SSEProvider } from './contexts/SSEContext';
+import GlobalSubscriptionHandler from './components/auth/GlobalSubscriptionHandler';
 import './i18n';
 
 const queryClient = new QueryClient({
@@ -37,6 +38,7 @@ function App() {
                 <SSEProvider>
                   <Suspense fallback={<LoadingSpinner overlay />}>
                     <AppRouter />
+                    <GlobalSubscriptionHandler />
                     <Toaster
                       position="top-right"
                       toastOptions={{