fix: StreamProvider for login state, rename LoginState to avoid matrix SDK conflict

lib/features/auth/login_page.dart

@@ -33,11 +33,7 @@ class _LoginPageState extends ConsumerState<LoginPage> {
           password: _passCtrl.text,
           homeserver: homeserver,
         );
-
-    final state = ref.read(loginNotifierProvider);
-    if (state.status == LoginStatus.idle && mounted) {
-      context.go('/rooms');
-    }
+    // Redirect erfolgt reaktiv über isLoggedInProvider → Router
   }
 
   @override
@@ -45,6 +41,7 @@ class _LoginPageState extends ConsumerState<LoginPage> {
     final theme = Theme.of(context);
     final loginState = ref.watch(loginNotifierProvider);
     final loading = loginState.status == LoginStatus.loading;
+
     final homeserver = ref.watch(homeserverProvider) ?? 'matrix.org';
 
     return Scaffold(