feat: Add Packet Log Screen for BLE packet logging and exporting

- Implemented PacketLogScreen to display and filter BLE packet logs.
- Added functionality to export logs as CSV and text files.
- Introduced clipboard copy feature for hex data.
- Implemented clear logs functionality with confirmation dialog.
- Enhanced MeshCoreBleService to log TX and RX packets with descriptions.
- Added BufferReader methods for reading unsigned and signed 16-bit integers (big-endian).
- Updated CayenneLppParser to read values as big-endian.
- Created MessageStorageService for persisting messages to local storage.
- Enhanced map markers to display telemetry data including voltage, humidity, and pressure.

lib/providers/app_provider.dart

@@ -80,24 +80,57 @@ class AppProvider with ChangeNotifier {
       // Load contacts
       await connectionProvider.getContacts();
 
+      // Sync any waiting messages from device queue
+      await _syncMessages();
+
       notifyListeners();
     } catch (e) {
       debugPrint('Initialization error: $e');
     }
   }
 
+  /// Sync messages from device queue
+  Future<void> _syncMessages() async {
+    if (!connectionProvider.deviceInfo.isConnected) return;
+
+    try {
+      debugPrint('🔄 [AppProvider] Starting message sync...');
+      final messageCount = await connectionProvider.syncAllMessages();
+      debugPrint('✅ [AppProvider] Synced $messageCount messages');
+    } catch (e) {
+      debugPrint('❌ [AppProvider] Message sync error: $e');
+    }
+  }
+
   /// Refresh data (contacts, messages)
   Future<void> refresh() async {
     if (!connectionProvider.deviceInfo.isConnected) return;
 
     try {
       await connectionProvider.getContacts();
+      await _syncMessages();
       notifyListeners();
     } catch (e) {
       debugPrint('Refresh error: $e');
     }
   }
 
+  /// Manually sync messages (useful for pull-to-refresh)
+  Future<int> syncMessages() async {
+    if (!connectionProvider.deviceInfo.isConnected) return 0;
+
+    try {
+      debugPrint('🔄 [AppProvider] Manual message sync requested');
+      final messageCount = await connectionProvider.syncAllMessages();
+      debugPrint('✅ [AppProvider] Synced $messageCount messages');
+      notifyListeners();
+      return messageCount;
+    } catch (e) {
+      debugPrint('❌ [AppProvider] Message sync error: $e');
+      return 0;
+    }
+  }
+
   /// Clear all data
   void clearAllData() {
     contactsProvider.clearContacts();