add offline mode - not yet functional really

lib/app_state.dart

@@ -28,6 +28,17 @@ class AppState extends ChangeNotifier {
     _init();
   }
 
+  // ------------------- Offline Mode -------------------
+  static const String _offlineModePrefsKey = 'offline_mode';
+  bool _offlineMode = false;
+  bool get offlineMode => _offlineMode;
+  Future<void> setOfflineMode(bool enabled) async {
+    _offlineMode = enabled;
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setBool(_offlineModePrefsKey, enabled);
+    notifyListeners();
+  }
+
   final _auth = AuthService();
   String? _username;
 
@@ -114,6 +125,10 @@ class AppState extends ChangeNotifier {
       await prefs.remove(_legacyTestModePrefsKey);
       await prefs.setInt(_uploadModePrefsKey, _uploadMode.index);
     }
+    // Offline mode loading
+    if (prefs.containsKey(_offlineModePrefsKey)) {
+      _offlineMode = prefs.getBool(_offlineModePrefsKey) ?? false;
+    }
     // Ensure AuthService follows loaded mode
     _auth.setUploadMode(_uploadMode);
 

lib/screens/settings_screen.dart

@@ -4,6 +4,7 @@ import 'settings_screen_sections/upload_mode_section.dart';
 import 'settings_screen_sections/profile_list_section.dart';
 import 'settings_screen_sections/queue_section.dart';
 import 'settings_screen_sections/offline_areas_section.dart';
+import 'settings_screen_sections/offline_mode_section.dart';
 import 'settings_screen_sections/about_section.dart';
 
 class SettingsScreen extends StatelessWidget {
@@ -24,10 +25,8 @@ class SettingsScreen extends StatelessWidget {
           Divider(),
           ProfileListSection(),
           Divider(),
-          Padding(
-            padding: EdgeInsets.only(bottom: 8.0),
-            child: Text('Offline Areas', style: TextStyle(fontSize: 16, fontWeight: FontWeight.bold)),
-          ),
+          OfflineModeSection(),
+          Divider(),
           OfflineAreasSection(),
           Divider(),
           AboutSection(),

lib/screens/settings_screen_sections/offline_mode_section.dart

@@ -0,0 +1,21 @@
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+import '../../app_state.dart';
+
+class OfflineModeSection extends StatelessWidget {
+  const OfflineModeSection({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    final appState = context.watch<AppState>();
+    return ListTile(
+      leading: const Icon(Icons.wifi_off),
+      title: const Text('Offline Mode'),
+      subtitle: const Text('Disable all network requests except for local/offline areas.'),
+      trailing: Switch(
+        value: appState.offlineMode,
+        onChanged: (value) async => await appState.setOfflineMode(value),
+      ),
+    );
+  }
+}