Add offline-first mode support to settings

- Add AppMode enum (local, online)
- Extend settings datasource with mode, setup, and onboarding flags
- Update settings viewmodel with mode helpers and persistence

lib/features/settings/data/settings_local_datasource.dart

@@ -1,11 +1,19 @@
 import 'package:flutter/material.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
+import '../domain/enums/app_mode.dart';
+
 abstract class SettingsLocalDataSource {
   Locale? getLocale();
   Future<void> setLocale(Locale locale);
   ThemeMode getThemeMode();
   Future<void> setThemeMode(ThemeMode mode);
+  AppMode? getAppMode();
+  Future<void> setAppMode(AppMode mode);
+  bool isSetupCompleted();
+  Future<void> setSetupCompleted(bool completed);
+  bool isOnboardingShown();
+  Future<void> setOnboardingShown(bool shown);
 }
 
 class SettingsLocalDataSourceImpl implements SettingsLocalDataSource {
@@ -13,6 +21,9 @@ class SettingsLocalDataSourceImpl implements SettingsLocalDataSource {
 
   static const String _localeKey = 'locale';
   static const String _themeModeKey = 'theme_mode';
+  static const String _appModeKey = 'app_mode';
+  static const String _setupCompletedKey = 'setup_completed';
+  static const String _onboardingShownKey = 'onboarding_shown';
 
   SettingsLocalDataSourceImpl({required this.sharedPreferences});
 
@@ -39,4 +50,36 @@ class SettingsLocalDataSourceImpl implements SettingsLocalDataSource {
   Future<void> setThemeMode(ThemeMode mode) async {
     await sharedPreferences.setInt(_themeModeKey, mode.index);
   }
+
+  @override
+  AppMode? getAppMode() {
+    final index = sharedPreferences.getInt(_appModeKey);
+    if (index == null) return null;
+    return AppMode.values[index];
+  }
+
+  @override
+  Future<void> setAppMode(AppMode mode) async {
+    await sharedPreferences.setInt(_appModeKey, mode.index);
+  }
+
+  @override
+  bool isSetupCompleted() {
+    return sharedPreferences.getBool(_setupCompletedKey) ?? false;
+  }
+
+  @override
+  Future<void> setSetupCompleted(bool completed) async {
+    await sharedPreferences.setBool(_setupCompletedKey, completed);
+  }
+
+  @override
+  bool isOnboardingShown() {
+    return sharedPreferences.getBool(_onboardingShownKey) ?? false;
+  }
+
+  @override
+  Future<void> setOnboardingShown(bool shown) async {
+    await sharedPreferences.setBool(_onboardingShownKey, shown);
+  }
 }

lib/features/settings/domain/enums/app_mode.dart

@@ -0,0 +1,4 @@
+enum AppMode {
+  local,
+  online,
+}

lib/features/settings/presentation/viewmodels/settings_viewmodel.dart

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 
 import '../../../../core/logging/app_logger.dart';
 import '../../data/settings_local_datasource.dart';
+import '../../domain/enums/app_mode.dart';
 
 class SettingsViewModel extends ChangeNotifier {
   final SettingsLocalDataSource dataSource;
@@ -16,9 +17,17 @@ class SettingsViewModel extends ChangeNotifier {
 
   Locale? _locale;
   ThemeMode _themeMode = ThemeMode.system;
+  AppMode? _appMode;
+  bool _setupCompleted = false;
+  bool _onboardingShown = false;
 
   Locale? get locale => _locale;
   ThemeMode get themeMode => _themeMode;
+  AppMode? get appMode => _appMode;
+  bool get setupCompleted => _setupCompleted;
+  bool get onboardingShown => _onboardingShown;
+  bool get isLocalMode => _appMode == AppMode.local;
+  bool get isOnlineMode => _appMode == AppMode.online;
 
   static const supportedLocales = [
     Locale('en'),
@@ -28,7 +37,10 @@ class SettingsViewModel extends ChangeNotifier {
   void _loadSettings() {
     _locale = dataSource.getLocale() ?? const Locale('en');
     _themeMode = dataSource.getThemeMode();
-    logger.info('Settings loaded: locale=$_locale, themeMode=$_themeMode');
+    _appMode = dataSource.getAppMode();
+    _setupCompleted = dataSource.isSetupCompleted();
+    _onboardingShown = dataSource.isOnboardingShown();
+    logger.info('Settings loaded: locale=$_locale, themeMode=$_themeMode, appMode=$_appMode, setupCompleted=$_setupCompleted, onboardingShown=$_onboardingShown');
   }
 
   Future<void> setLocale(Locale locale) async {
@@ -45,6 +57,27 @@ class SettingsViewModel extends ChangeNotifier {
     notifyListeners();
   }
 
+  Future<void> setAppMode(AppMode mode) async {
+    _appMode = mode;
+    await dataSource.setAppMode(mode);
+    logger.info('App mode changed to: $mode');
+    notifyListeners();
+  }
+
+  Future<void> setSetupCompleted(bool completed) async {
+    _setupCompleted = completed;
+    await dataSource.setSetupCompleted(completed);
+    logger.info('Setup completed: $completed');
+    notifyListeners();
+  }
+
+  Future<void> setOnboardingShown(bool shown) async {
+    _onboardingShown = shown;
+    await dataSource.setOnboardingShown(shown);
+    logger.info('Onboarding shown: $shown');
+    notifyListeners();
+  }
+
   String getLanguageName(Locale locale) {
     switch (locale.languageCode) {
       case 'en':