feat: Added Antenna selection to Flex FlexPanel

feat: New settings flexradio to select antennas per band

app.go

@@ -7426,6 +7426,83 @@ func (a *App) FlexSetMute(on bool) error {
 	return a.cat.FlexDo(func(fc cat.FlexController) error { return fc.SetMute(on) })
 }
 
+func (a *App) FlexSetRXAntenna(ant string) error {
+	if a.cat == nil {
+		return fmt.Errorf("cat not initialized")
+	}
+	return a.cat.FlexDo(func(fc cat.FlexController) error { return fc.SetRXAntenna(ant) })
+}
+
+func (a *App) FlexSetTXAntenna(ant string) error {
+	if a.cat == nil {
+		return fmt.Errorf("cat not initialized")
+	}
+	return a.cat.FlexDo(func(fc cat.FlexController) error { return fc.SetTXAntenna(ant) })
+}
+
+// keyFlexBandAnt stores the per-band RX/TX antenna map (global, machine-local).
+const keyFlexBandAnt = "flex.band_antennas"
+
+// FlexBandAnt is the antenna pair to select on a given band.
+type FlexBandAnt struct {
+	RX string `json:"rx"`
+	TX string `json:"tx"`
+}
+
+// GetFlexBandAntennas returns the band→{rx,tx} antenna map (band key uppercased,
+// e.g. "20M").
+func (a *App) GetFlexBandAntennas() (map[string]FlexBandAnt, error) {
+	out := map[string]FlexBandAnt{}
+	if a.settings == nil {
+		return out, nil
+	}
+	v, _ := a.settings.GetGlobal(a.ctx, keyFlexBandAnt)
+	if strings.TrimSpace(v) == "" {
+		return out, nil
+	}
+	_ = json.Unmarshal([]byte(v), &out)
+	return out, nil
+}
+
+// SaveFlexBandAntennas persists the band→antenna map.
+func (a *App) SaveFlexBandAntennas(m map[string]FlexBandAnt) error {
+	if a.settings == nil {
+		return fmt.Errorf("db not initialized")
+	}
+	b, err := json.Marshal(m)
+	if err != nil {
+		return err
+	}
+	return a.settings.SetGlobal(a.ctx, keyFlexBandAnt, string(b))
+}
+
+// FlexApplyBandAntenna selects the configured RX/TX antennas for the given band
+// (no-op if the backend isn't a Flex or the band has no mapping). Called on band
+// changes and spot clicks so the right antennas follow the frequency.
+func (a *App) FlexApplyBandAntenna(band string) error {
+	if a.cat == nil {
+		return nil
+	}
+	band = strings.ToUpper(strings.TrimSpace(band))
+	if band == "" {
+		return nil
+	}
+	m, _ := a.GetFlexBandAntennas()
+	ant, ok := m[band]
+	if !ok {
+		return nil
+	}
+	return a.cat.FlexDo(func(fc cat.FlexController) error {
+		if strings.TrimSpace(ant.RX) != "" {
+			_ = fc.SetRXAntenna(ant.RX)
+		}
+		if strings.TrimSpace(ant.TX) != "" {
+			_ = fc.SetTXAntenna(ant.TX)
+		}
+		return nil
+	})
+}
+
 func (a *App) FlexSetNB(on bool) error {
 	if a.cat == nil {
 		return fmt.Errorf("cat not initialized")