feat: SPE amp ON/OFF buttons and Low/Mid/High power-level control (keystroke codes best-guess from APG, pending hw verification)

app.go

@@ -12261,6 +12261,25 @@ func (a *App) SPESetOperate(on bool) error {
 	return a.spe.Operate(on)
 }
 
+// SPESetPower turns the SPE amp on (true, POWER key) or off (false, OFF key).
+func (a *App) SPESetPower(on bool) error {
+	if a.spe == nil {
+		return fmt.Errorf("SPE amplifier not connected — enable it in Settings → Amplifier")
+	}
+	if on {
+		return a.spe.PowerOn()
+	}
+	return a.spe.PowerOff()
+}
+
+// SPESetPowerLevel selects the SPE output power level ("L"/"M"/"H").
+func (a *App) SPESetPowerLevel(level string) error {
+	if a.spe == nil {
+		return fmt.Errorf("SPE amplifier not connected — enable it in Settings → Amplifier")
+	}
+	return a.spe.SetPowerLevel(level)
+}
+
 // GetPGXLStatus returns the amp's fan/connection state for the UI poll.
 func (a *App) GetPGXLStatus() powergenius.Status {
 	if a.pgxl == nil {