fixed stale state after logout and replayed or lost share intents

lib/view/login/login_controller.dart

@@ -11,6 +11,7 @@ import '../../api/marianumconnect/auth/token_storage.dart';
 import '../../api/marianumconnect/queries/auth_login/auth_login.dart';
 import '../../api/marianumconnect/queries/auth_logout/auth_logout.dart';
 import '../../model/account_data.dart';
+import '../../model/session_wipe.dart';
 import '../../widget_data/widget_sync.dart';
 
 /// Outcome of a login attempt.
@@ -46,6 +47,10 @@ class LoginController extends ChangeNotifier {
     _errorDetails = null;
     notifyListeners();
 
+    // The previous account's wipe runs deferred; racing it would let it
+    // clear what this login stores (widget job, caches).
+    await SessionWipe.done;
+
     final user = username.trim().toLowerCase();
 
     // Demo login: the prefix enters local demo mode, password ignored, no