new favourites feature

lib/services/storage_service.dart

@@ -7,6 +7,8 @@ import 'package:flutter/foundation.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
 import '../models/bank.dart';
+import '../models/home_filter_widget.dart';
+import '../models/overview_favourite.dart';
 import '../models/transaction_meta.dart';
 import '../utils/constants.dart';
 
@@ -133,6 +135,54 @@ class StorageService {
     return _prefs.setInt(StorageKeys.lookAheadMaxYears, years.clamp(1, 30));
   }
 
+  List<OverviewFavourite> loadOverviewFavourites() {
+    final raw = _prefs.getString(StorageKeys.overviewFavourites);
+    if (raw == null || raw.isEmpty) return const [];
+    try {
+      final decoded = jsonDecode(raw);
+      if (decoded is! List) return const [];
+      return [
+        for (final item in decoded)
+          if (item is Map)
+            OverviewFavourite.fromJson(Map<String, dynamic>.from(item)),
+      ];
+    } catch (_) {
+      return const [];
+    }
+  }
+
+  Future<void> saveOverviewFavourites(List<OverviewFavourite> favourites) {
+    final encoded = jsonEncode([
+      for (final fav in favourites) fav.toJson(),
+    ]);
+    return _prefs.setString(StorageKeys.overviewFavourites, encoded);
+  }
+
+  List<HomeFilterWidget> loadHomeFilterWidgets() {
+    final raw = _prefs.getString(StorageKeys.homeFilterWidgets);
+    if (raw == null || raw.isEmpty) return const [];
+    try {
+      final decoded = jsonDecode(raw);
+      if (decoded is! List) return const [];
+      final list = [
+        for (final item in decoded)
+          if (item is Map)
+            HomeFilterWidget.fromJson(Map<String, dynamic>.from(item)),
+      ];
+      list.sort((a, b) => a.sortOrder.compareTo(b.sortOrder));
+      return list;
+    } catch (_) {
+      return const [];
+    }
+  }
+
+  Future<void> saveHomeFilterWidgets(List<HomeFilterWidget> widgets) {
+    final encoded = jsonEncode([
+      for (final w in widgets) w.toJson(),
+    ]);
+    return _prefs.setString(StorageKeys.homeFilterWidgets, encoded);
+  }
+
   bool get useRemoteData => _prefs.getBool(StorageKeys.useRemoteData) ?? false;
 
   Future<void> setUseRemoteData(bool value) {