checkpoint

lib/providers/providers.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:shared_preferences/shared_preferences.dart';
 import '../api/types.dart';
 import '../api/client.dart';
 import '../api/openapi_config.dart';
@@ -125,15 +126,24 @@ final allDeliveriesProvider = FutureProvider<List<Delivery>>((ref) async {
   return allDeliveries;
 });
 
-// Language notifier for state management
-class LanguageNotifier extends Notifier<String> {
-  @override
-  String build() => 'system';
+// Language notifier for state management with SharedPreferences persistence
+class LanguageNotifier extends AsyncNotifier<String> {
+  static const String _languageKey = 'app_language';
 
-  void setLanguage(String lang) => state = lang;
+  @override
+  Future<String> build() async {
+    final prefs = await SharedPreferences.getInstance();
+    return prefs.getString(_languageKey) ?? 'system';
+  }
+
+  Future<void> setLanguage(String lang) async {
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setString(_languageKey, lang);
+    state = AsyncValue.data(lang);
+  }
 }
 
-final languageProvider = NotifierProvider<LanguageNotifier, String>(() {
+final languageProvider = AsyncNotifierProvider<LanguageNotifier, String>(() {
   return LanguageNotifier();
 });