Fix macOS Bluetooth state and add RTK debug console

FieldLogger/Services/MaglinkService.cs

@@ -24,6 +24,8 @@ public sealed class MaglinkService : IAsyncDisposable
 
     public event EventHandler<GnssFix>? FixReceived;
     public event EventHandler<GnssDeviceInfo>? DeviceInfoReceived;
+    /// <summary>Every complete line received from the RTK receiver, before validation or parsing.</summary>
+    public event EventHandler<string>? LineReceived;
     public event EventHandler? Disconnected;
 
     /// <summary>Device-name filter for scan results (ML-*).</summary>
@@ -62,6 +64,8 @@ public sealed class MaglinkService : IAsyncDisposable
 
     private void OnLineReceived(object? sender, string line)
     {
+        LineReceived?.Invoke(this, line);
+
         if (line.StartsWith("$GNPOS,", StringComparison.Ordinal))
         {
             if (!NmeaSentence.VerifyChecksum(line))