feat(cat): MY_RIG follows the radio that is connected

With one rig, MY_RIG belonged in Operating conditions and nowhere else.
With several, that becomes the wrong place: operating conditions describe
a PLAN — 'on 20 m I use the beam and the 7300' — while the question a
logged QSO asks is which radio was keying.

So each saved radio carries its own MY_RIG, consulted BEFORE the per-band
station. When the two disagree — a second rig borrowed for one evening on
20 m — the one that is transmitting is the true answer.

Left empty it changes nothing at all: the old chain (band default, then
the profile's rig) answers exactly as it did, which is what every
single-radio station will keep doing without touching a setting.

app.go

@@ -3338,6 +3338,10 @@ func (a *App) applyStationDefaults(q *qso.QSO, includeIdentity bool) {
 	// Per-band rig/antenna from Operating conditions (the antenna ticked as
 	// DEFAULT for this band) — the same auto-fill the entry strip does, applied
 	// here so imported QSOs get MY_RIG / MY_ANTENNA from the band defaults.
+	// The radio that is CONNECTED names itself first — see activeRadioMyRig.
+	if q.MyRig == "" {
+		q.MyRig = a.activeRadioMyRig()
+	}
 	if a.operating != nil && q.Band != "" && (q.MyRig == "" || q.MyAntenna == "") {
 		if d, ok, _ := a.operating.BandDefault(a.ctx, p.ID, q.Band); ok {
 			if q.MyRig == "" {
@@ -13401,7 +13405,12 @@ func (a *App) LogUDPLoggedADIF(adifText string) (int64, error) {
 
 	// ── Operating-conditions stamp ──
 	// Pre-fill MY_RIG / MY_ANTENNA / TX_PWR from the default antenna for
-	// this band (if the user has configured Operating conditions).
+	// this band (if the user has configured Operating conditions) — after the
+	// connected radio has had its say, since it knows which rig is keying and
+	// the band default only knows which one was planned.
+	if q.MyRig == "" {
+		q.MyRig = a.activeRadioMyRig()
+	}
 	if a.operating != nil && a.profiles != nil {
 		if p, err := a.profiles.Active(a.ctx); err == nil {
 			if d, ok2, _ := a.operating.BandDefault(a.ctx, p.ID, q.Band); ok2 {