feat: Adding XIT RIT in the Flex panel

app.go

@@ -9684,6 +9684,36 @@ func (a *App) FlexApplyBandAntenna(band string) error {
 	})
 }
 
+// RIT/XIT on the active slice. The offset is kept by the radio when the switch is
+// off, so turning it back on restores it — the UI must not zero it on toggle.
+func (a *App) FlexSetRIT(on bool) error {
+	if a.cat == nil {
+		return fmt.Errorf("cat not initialized")
+	}
+	return a.cat.FlexDo(func(fc cat.FlexController) error { return fc.SetRIT(on) })
+}
+
+func (a *App) FlexSetRITFreq(hz int) error {
+	if a.cat == nil {
+		return fmt.Errorf("cat not initialized")
+	}
+	return a.cat.FlexDo(func(fc cat.FlexController) error { return fc.SetRITFreq(hz) })
+}
+
+func (a *App) FlexSetXIT(on bool) error {
+	if a.cat == nil {
+		return fmt.Errorf("cat not initialized")
+	}
+	return a.cat.FlexDo(func(fc cat.FlexController) error { return fc.SetXIT(on) })
+}
+
+func (a *App) FlexSetXITFreq(hz int) error {
+	if a.cat == nil {
+		return fmt.Errorf("cat not initialized")
+	}
+	return a.cat.FlexDo(func(fc cat.FlexController) error { return fc.SetXITFreq(hz) })
+}
+
 func (a *App) FlexSetNB(on bool) error {
 	if a.cat == nil {
 		return fmt.Errorf("cat not initialized")