feat: Enhance device configuration and location tracking features

- Refetch device info after updating settings in device_config_screen.dart.
- Update map_tab.dart to use singleton instance of LocationTrackingService and streamline location tracking callbacks.
- Modify ble_response_handler.dart to handle contact not found errors and improve error callback structure.
- Enhance location_tracking_service.dart with retry logic for GPS position acquisition and initial position setting without broadcasting.
- Update meshcore_ble_service.dart to track last contact for auto-recovery on errors.
- Improve tile_cache_service.dart error messages and streamline tile download logic.
- Add current GPS location insertion feature in direct_message_sheet.dart with permission checks.
- Update pubspec.lock and pubspec.yaml to include integration_test dependency.
- Add screenshot automation script for iOS and Android devices.
- Create integration test driver for screenshot capturing.

lib/providers/app_provider.dart

@@ -198,6 +198,23 @@ class AppProvider with ChangeNotifier {
       debugPrint('✅ [AppProvider] Message delivered - ACK: $ackCode, RTT: ${roundTripTimeMs}ms');
       messagesProvider.markMessageDelivered(ackCode, roundTripTimeMs);
     };
+
+    // Wire up MessagesProvider's sendMessageCallback for retry logic
+    messagesProvider.sendMessageCallback = ({
+      required contactPublicKey,
+      required text,
+      required messageId,
+      required contact,
+      retryAttempt = 0,
+    }) async {
+      return await connectionProvider.sendTextMessage(
+        contactPublicKey: contactPublicKey,
+        text: text,
+        messageId: messageId,
+        contact: contact,
+        retryAttempt: retryAttempt,
+      );
+    };
   }
 
   /// Initialize the app (load contacts, sync time, etc.)