widget refresh enhancements

lib/widget_data/widget_sync.dart

@@ -12,14 +12,18 @@ class WidgetSync {
   static const String iosAppGroupId =
       'group.eu.mhsl.marianum.mobile.client.widget';
 
-  static const String iosWidgetKind = 'TimetableWidget';
+  // Must match the WidgetKit `kind` strings declared in
+  // TimetableWidgetExtension.swift — a mismatch makes reloadTimelines a no-op.
+  static const String iosDayWidgetKind = 'TimetableDayWidget';
+  static const String iosWeekWidgetKind = 'TimetableWeekWidget';
   static const String androidDayProvider = 'TimetableDayWidget';
   static const String androidWeekProvider = 'TimetableWeekWidget';
 
-  // `_v1` suffix lets a future schema change invalidate stale snapshots
-  // by bumping the key instead of risking a parse crash.
+  // Version suffix lets a schema change invalidate stale snapshots by
+  // bumping the key instead of risking a parse crash.
   static const String dayDataKey = 'widget_data_day_v1';
-  static const String weekDataKey = 'widget_data_week_v1';
+  // v2: 14-day window + per-day `days` holiday info.
+  static const String weekDataKey = 'widget_data_week_v2';
   static const String fetchedAtKey = 'widget_data_fetched_at_v1';
   static const String loggedInKey = 'widget_data_logged_in_v1';
   // Mirrored into widget storage so the background isolate can read it
@@ -90,6 +94,12 @@ class WidgetSync {
     return HomeWidget.getWidgetData<String>(marianumConnectBaseUrlKey);
   }
 
+  static Future<DateTime?> getFetchedAt() async {
+    await ensureInitialized();
+    final raw = await HomeWidget.getWidgetData<String>(fetchedAtKey);
+    return raw == null ? null : DateTime.tryParse(raw);
+  }
+
   static Future<void> clear() async {
     await ensureInitialized();
     await HomeWidget.saveWidgetData<String>(dayDataKey, null);
@@ -103,11 +113,11 @@ class WidgetSync {
     try {
       await HomeWidget.updateWidget(
         androidName: androidDayProvider,
-        iOSName: iosWidgetKind,
+        iOSName: iosDayWidgetKind,
       );
       await HomeWidget.updateWidget(
         androidName: androidWeekProvider,
-        iOSName: iosWidgetKind,
+        iOSName: iosWeekWidgetKind,
       );
     } on Exception catch (e) {
       log('WidgetSync.triggerUpdate failed: $e');