added base homescreen-widget setup, working on Android, iOS in progress

lib/main.dart

@@ -19,6 +19,7 @@ import 'package:shared_preferences/shared_preferences.dart';
 
 import 'api/mhsl/breaker/get_breakers/get_breakers_response.dart';
 import 'app.dart';
+import 'background/widget_background_task.dart';
 import 'firebase_options.dart';
 import 'model/account_data.dart';
 import 'state/app/modules/account/bloc/account_bloc.dart';
@@ -35,6 +36,7 @@ import 'view/login/login.dart';
 import 'widget/app_progress_indicator.dart';
 import 'widget/breaker/breaker.dart';
 import 'widget/debug/cache_view.dart';
+import 'widget_data/widget_sync.dart';
 
 Future<void> main() async {
   log('MarianumMobile started');
@@ -72,6 +74,15 @@ Future<void> main() async {
   await Future.wait(initialisationTasks);
   log('app initialisation done!');
 
+  // Wire up the home-screen widget bridge before runApp so any widget render
+  // triggered during startup hits initialised native storage.
+  await WidgetSync.ensureInitialized();
+  unawaited(
+    WidgetBackgroundTask.initialize().onError(
+      (e, _) => log('Workmanager init failed: $e'),
+    ),
+  );
+
   unawaited(
     FirebaseMessaging.instance.getToken().then(
       (token) => log('Firebase token: ${token ?? "Error: no Firebase token!"}'),
@@ -287,6 +298,12 @@ Future<void> _wipeUserState({
     await prefs.clear();
     await HydratedBloc.storage.clear();
     await const CacheView().clear();
+    // Stop the periodic widget refresh job so the background isolate doesn't
+    // wake up every 30 minutes only to write `loggedIn=false`. Re-registers
+    // on the next successful login.
+    await WidgetBackgroundTask.cancelAll();
+    await WidgetSync.clear();
+    await WidgetSync.triggerUpdate();
   } catch (e, s) {
     log('User state wipe failed: $e', stackTrace: s);
   }