fix(kpa): its own card, and no band-follow it does not need

Two things the wiring got wrong, both visible on screen.

A KPA fell through to the PowerGenius branch of the amplifier card and was
drawn as one — titled 'POWERGENIUSXL · ELECRAFT KPA1500', with a
PowerGenius's meters and none of its own. It has a card now: OPERATE, ON
and OFF, band, power, SWR, temperature, supply, and the fault across the
end. The OPERATE button carries a tooltip saying it also clears the fault,
because that is the button an operator already has under the cursor when
they need it.

And the band-follow option was offered on it. That option exists because
an Acom POLLS a transceiver and has no command to be given a band, so
following it needs a second serial port and a rig emulator answering those
polls. The KPA has ^BN — OpsLog simply tells it, on the link it is already
using, and only when the band CHANGES. The option is gone from the KPA and
the telling is automatic.

Also: Acom rather than ACOM everywhere it is read, which is how the
company writes it. Identifiers, package names and log lines are left
alone — renaming those is churn with no reader.

app.go

@@ -18106,7 +18106,7 @@ func ampTypeLabel(t string) string {
 	case strings.HasPrefix(t, "spe"):
 		return "SPE " + map[string]string{"spe13": "1.3K-FA", "spe15": "1.5K-FA", "spe2k": "2K-FA"}[t]
 	case strings.HasPrefix(t, "acom"):
-		return "ACOM " + strings.TrimPrefix(t, "acom") + "S"
+		return "Acom " + strings.TrimPrefix(t, "acom") + "S"
 	case strings.HasPrefix(t, "kpa"):
 		return "Elecraft " + strings.ToUpper(t)
 	}
@@ -18278,6 +18278,17 @@ func (a *App) feedAmpBandFollow(s cat.RigState) {
 			inst.catemu.SetFrequency(s.FreqHz)
 			inst.catemu.SetMode(s.Mode)
 		}
+		// A KPA is TOLD its band, on the link it is already on.
+		//
+		// The emulator above exists because an Acom polls a transceiver and has
+		// no command to be given a band; the KPA has one (^BN), so it needs
+		// neither a second serial port nor a pretend rig. Sent from a goroutine
+		// because this runs on the CAT state-change path, and nothing about the
+		// rig should wait on an amplifier's link.
+		if inst.kpa != nil && s.Band != "" {
+			k, band := inst.kpa, s.Band
+			go func() { _ = k.SetBand(band) }()
+		}
 	}
 }
 
@@ -18553,7 +18564,7 @@ func (a *App) GetACOMStatus() acom.Status {
 // protocol has explicit commands for each, unlike the SPE's toggle key.
 func (a *App) ACOMSetOperate(on bool) error {
 	if a.acom == nil {
-		return fmt.Errorf("ACOM amplifier not connected — enable it in Settings → Amplifier")
+		return fmt.Errorf("Acom amplifier not connected — enable it in Settings → Amplifier")
 	}
 	return a.acom.Operate(on)
 }
@@ -18562,7 +18573,7 @@ func (a *App) ACOMSetOperate(on bool) error {
 // the power-on pins wired in the cable) or off (false, the OFF data command).
 func (a *App) ACOMSetPower(on bool) error {
 	if a.acom == nil {
-		return fmt.Errorf("ACOM amplifier not connected — enable it in Settings → Amplifier")
+		return fmt.Errorf("Acom amplifier not connected — enable it in Settings → Amplifier")
 	}
 	if on {
 		return a.acom.PowerOn()