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.

frontend/src/components/AmpWidget.tsx

@@ -124,7 +124,7 @@ function AmpBlock({ amp, flex, showName, t }: {
         {showName && (
           <div className="flex items-center gap-1.5">
             <span className={cn('size-1.5 rounded-full shrink-0', s.connected ? 'bg-success shadow-[0_0_6px_rgba(16,185,129,0.8)]' : 'bg-danger')} />
-            <span className="text-[10px] font-bold uppercase tracking-wider truncate">{amp.name || (spe ? 'SPE' : kpaAmp ? (s.model || 'KPA') : 'ACOM')}</span>
+            <span className="text-[10px] font-bold uppercase tracking-wider truncate">{amp.name || (spe ? 'SPE' : kpaAmp ? (s.model || 'KPA') : 'Acom')}</span>
             {s.connected && s.band && <span className="ml-auto text-[9px] text-muted-foreground shrink-0">{s.band}</span>}
           </div>
         )}