add offline mode - not yet functional really

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),
+      ),
+    );
+  }
+}