fix(icom): the console PTT carries the microphone on a network station

Keying alone is right on USB, where the operator talks into the radio's own
mic; over the LAN it transmitted silence. The console button now goes through
one binding that picks the road: network To-radio → the same key-and-stream
path as the Talk button, USB → key and nothing more.

app.go

@@ -21156,3 +21156,23 @@ func (a *App) CheckHamlogKey(key string) (string, error) {
 func (a *App) GetAudioMonitorPref() bool {
 	return a.settingOr(keyAudioMonitorOn, "1") == "1"
 }
+
+// IcomConsolePTT is the console's PTT button. On a USB station it keys the
+// rig and nothing more — the operator talks into the radio's own microphone.
+// When the transmit audio goes over the NETWORK, keying alone transmits
+// silence: the PC microphone must be routed with it, exactly as the Talk
+// button does. One button, the right road picked here.
+func (a *App) IcomConsolePTT(on bool) error {
+	cfg, _ := a.GetAudioSettings()
+	if cfg.ToRadio == audio.NetworkDeviceID {
+		if on {
+			return a.AudioStartTX()
+		}
+		a.AudioStopTX()
+		return nil
+	}
+	if a.cat == nil {
+		return fmt.Errorf("cat not initialized")
+	}
+	return a.cat.SetPTT(on)
+}