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/providers/channels_provider.dart

@@ -0,0 +1,51 @@
+import 'package:flutter/foundation.dart';
+import '../models/channel.dart';
+
+/// Manages channel information from the MeshCore device
+class ChannelsProvider with ChangeNotifier {
+  final Map<int, Channel> _channels = {};
+
+  /// Get all channels
+  List<Channel> get channels => _channels.values.toList()..sort((a, b) => a.index.compareTo(b.index));
+
+  /// Get a specific channel by index
+  Channel? getChannel(int index) => _channels[index];
+
+  /// Get the display name for a channel
+  String getChannelDisplayName(int index) {
+    final channel = _channels[index];
+    if (channel != null) {
+      return channel.displayName;
+    }
+    // Fallback if channel hasn't been synced yet
+    return index == 0 ? 'Public' : 'Channel $index';
+  }
+
+  /// Add or update a channel
+  void addOrUpdateChannel(int index, String name, {int? flags}) {
+    _channels[index] = Channel(
+      index: index,
+      name: name,
+      flags: flags,
+    );
+    notifyListeners();
+  }
+
+  /// Clear all channels
+  void clear() {
+    _channels.clear();
+    notifyListeners();
+  }
+
+  /// Check if channels have been loaded
+  bool get hasChannels => _channels.isNotEmpty;
+
+  /// Get the number of channels
+  int get channelCount => _channels.length;
+
+  @override
+  void dispose() {
+    _channels.clear();
+    super.dispose();
+  }
+}