Change core prefs to use code generation

lib/core/prefs/locale_prefs.dart

@@ -1,17 +1,28 @@
 import 'package:dartx/dartx.dart';
 import 'package:flutter/widgets.dart';
+import 'package:hiddify/data/data_providers.dart';
 import 'package:hiddify/gen/fonts.gen.dart';
 import 'package:hiddify/gen/translations.g.dart';
 import 'package:hiddify/utils/pref_notifier.dart';
+import 'package:riverpod_annotation/riverpod_annotation.dart';
 
 export 'package:hiddify/gen/translations.g.dart';
 
-final localeProvider = AlwaysAlivePrefNotifier.provider(
-  "locale",
-  AppLocale.en,
-  mapFrom: AppLocale.values.byName,
-  mapTo: (value) => value.name,
-);
+part 'locale_prefs.g.dart';
+
+@Riverpod(keepAlive: true)
+class LocaleNotifier extends _$LocaleNotifier {
+  late final _pref =
+      Pref(ref.watch(sharedPreferencesProvider), "locale", AppLocale.en);
+
+  @override
+  AppLocale build() => _pref.getValue();
+
+  Future<void> update(AppLocale value) {
+    state = value;
+    return _pref.update(value);
+  }
+}
 
 enum AppLocale {
   en,