feat: Enhance MeshCoreConnector with storage metrics and improve error handling

- Added storageUsedKb and storageTotalKb properties to MeshCoreConnector.
- Updated battery and storage frame parsing with improved error handling.
- Refactored log RX data handling to use BufferReader for better readability and error management.
- Enhanced message parsing in ChannelMessage and Message classes to utilize BufferReader.
- Introduced new text type for signed messages in meshcore_protocol.dart.
- Updated BLE debug log screen to use BufferReader for payload parsing.
- Refactored message retry service to handle ACK hashes as integers instead of Uint8List.
- Improved message storage serialization and deserialization to accommodate new expectedAckHash type.
- Added wasPulled property to Contact model for better state management.

lib/services/ble_debug_log_service.dart

@@ -245,6 +245,19 @@ class BleDebugLogService extends ChangeNotifier {
     }
   }
 
+  // Helper to read uint32 little-endian
+  int readUint32LE(Uint8List data, int offset) {
+    return data[offset] |
+        (data[offset + 1] << 8) |
+        (data[offset + 2] << 16) |
+        (data[offset + 3] << 24);
+  }
+
+  // // Helper to read uint16 little-endian
+  int readUint16LE(Uint8List data, int offset) {
+    return data[offset] | (data[offset + 1] << 8);
+  }
+
   String _frameDetail(int code, Uint8List frame) {
     switch (code) {
       case respCodeSent: