feat: Implement command queue for BLE command handling

- Added BleCommandQueue to manage command serialization and responses in BleCommandSender.
- Updated writeData, writeDataAndWaitForAck, and writeDataAndWaitForResponse methods to utilize the command queue.
- Enhanced BleResponseHandler to complete commands based on responses received from the BLE device.
- Introduced new commands for channel management, including getChannel and setChannel.
- Created LocationTrailLayer and TrailControls widgets for displaying and managing location trails on the map.
- Added PermissionRequestDialog to handle location permission requests on app startup.
- Updated LocationTrackingService to allow GPS tracking without a BLE connection.

lib/services/location_tracking_service.dart

@@ -246,19 +246,20 @@ class LocationTrackingService {
   /// Returns true if successful, false otherwise.
   /// Note: This method returns immediately after starting the position stream.
   /// Initial position acquisition happens asynchronously in the background.
+  ///
+  /// GPS tracking works WITHOUT BLE connection - device broadcasts are simply skipped.
   Future<bool> startTracking({double? distanceThreshold}) async {
-    if (!_isInitialized || _bleService == null) {
+    if (!_isInitialized) {
       debugPrint(
-        '⚠️ [LocationTracking] Service not initialized or BLE service null',
+        '⚠️ [LocationTracking] Service not initialized',
       );
       onError?.call('Location tracking service not initialized');
       return false;
     }
 
-    if (!_bleService!.isConnected) {
-      debugPrint('⚠️ [LocationTracking] BLE not connected');
-      onError?.call('Not connected to mesh device');
-      return false;
+    // Allow tracking without BLE connection - broadcasts will be skipped
+    if (_bleService == null || !_bleService!.isConnected) {
+      debugPrint('ℹ️ [LocationTracking] Starting GPS tracking without BLE connection (broadcasts disabled)');
     }
 
     // Check permissions