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lib/services/storage_service.dart

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+/// Thin wrapper around [SharedPreferences] for local key-value persistence.
+library;
+
+import 'package:shared_preferences/shared_preferences.dart';
+
+import '../utils/constants.dart';
+
+/// Loads and stores user preferences. Call [init] once at startup.
+class StorageService {
+  StorageService({this._preferences});
+
+  SharedPreferences? _preferences;
+
+  Future<void> init() async {
+    _preferences ??= await SharedPreferences.getInstance();
+  }
+
+  SharedPreferences get _prefs {
+    final prefs = _preferences;
+    if (prefs == null) {
+      throw StateError('StorageService.init() must be called before use.');
+    }
+    return prefs;
+  }
+
+  String get themeModeName =>
+      _prefs.getString(StorageKeys.themeMode) ?? 'system';
+
+  Future<void> setThemeModeName(String value) {
+    return _prefs.setString(StorageKeys.themeMode, value);
+  }
+
+  bool get useRemoteData => _prefs.getBool(StorageKeys.useRemoteData) ?? false;
+
+  Future<void> setUseRemoteData(bool value) {
+    return _prefs.setBool(StorageKeys.useRemoteData, value);
+  }
+}