Show active transmission in tone test mode

client.go

@@ -69,6 +69,10 @@ func (b *Barnard) connect(reconnect bool) bool {
 		b.toneTestStop = make(chan struct{})
 		go StartToneGenerator(b.Client, b.toneTestStop)
 		b.Tx = true
+		// Tone mode starts transmitting immediately. Reflect that in the UI so
+		// the F8 toggle has a visible initial state and transition.
+		b.UpdateGeneralStatus(" Tx  ", true)
+		b.AddOutputLine("Tone test transmission started")
 
 		b.Connected = true
 		return true