fix: Update battery voltage reading and adjust path length handling in ChannelMessage

lib/connector/meshcore_connector.dart

@@ -3043,7 +3043,7 @@ class MeshCoreConnector extends ChangeNotifier {
     try {
       final reader = BufferReader(frame);
       reader.skipBytes(1);
-      _batteryMillivolts = reader.readInt16LE();
+      _batteryMillivolts = reader.readUInt16LE();
       _storageUsedKb = reader.readUInt32LE();
       _storageTotalKb = reader.readUInt32LE();
       final volts = (_batteryMillivolts! / 1000.0).toStringAsFixed(2);

lib/models/channel_message.dart

@@ -132,17 +132,15 @@ class ChannelMessage {
         final hasPath = (flags & 0x01) != 0;
         reader.skipBytes(1); // Skip reserved byte
         channelIdx = reader.readByte();
-        pathLen = reader.readByte();
+        pathLen = reader.readInt8();
         txtType = reader.readByte();
         if (hasPath && pathLen > 0) {
           reader.rewind(); // Rewind to read path length again for pathBytes
           pathBytes = reader.readBytes(pathLen);
-        } else {
-          pathLen = 0;
         }
       } else {
         channelIdx = reader.readByte();
-        pathLen = reader.readByte();
+        pathLen = reader.readInt8();
         txtType = reader.readByte();
       }
       final timestampRaw = reader.readUInt32LE();

lib/screens/settings_screen.dart

@@ -975,7 +975,6 @@ void _privacySettings(BuildContext context, MeshCoreConnector connector) {
                 value: advertLocPolicy,
                 onChanged: (value) {
                   setDialogState(() => advertLocPolicy = value);
-                  advertLocPolicy = value;
                 },
               ),
               const SizedBox(height: 8),