Add Send/Recv gauges, fix tick loop to consume without BLE

- Four gauges: Send A/B (commanded) and Recv A/B (device-reported)
- State.LastSentA/B tracks what would be sent after limiting
- ConsumeTick always runs; only SendB0 gated on IsConnected
- Stream queues drain correctly in dev mode (no box)
- Tray icon hot state works without BLE connected
- Removed strength text label, widened form to 420x360

State.cs

@@ -16,6 +16,7 @@ public class State
     public readonly ConcurrentQueue<WaveFrame> StreamB = new();
 
     public int ActualA, ActualB;
+    public int LastSentA, LastSentB;
 
     public int MaxStrength = 200;
     public LimitMode LimitMode = LimitMode.Clamp;
@@ -99,6 +100,8 @@ public class State
                     : (byte)Math.Clamp(desired, 0, limit);
             var valA  = ApplyLimit(DesiredA);
             var valB  = ApplyLimit(DesiredB);
+            LastSentA = valA;
+            LastSentB = valB;
             DirtyA = false;
             DirtyB = false;