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/SettingsModal.tsx

@@ -4196,6 +4196,7 @@ function SettingsModalImpl({ onClose, onSaved, initialSection, onMainPaneChanged
             const brand = brandOf(amp.type);
             const isPGXL = brand === 'pgxl';
             const isACOM = brand === 'acom';
+            const isKPA = brand === 'kpa';
             const isSerial = !isPGXL && amp.transport === 'serial';
             return (
               <div key={amp.id || `new-${i}`} className="rounded-lg border border-border p-3 space-y-3">
@@ -4223,7 +4224,7 @@ function SettingsModalImpl({ onClose, onSaved, initialSection, onMainPaneChanged
                       <SelectContent>
                         <SelectItem value="pgxl">4O3A</SelectItem>
                         <SelectItem value="spe">SPE</SelectItem>
-                        <SelectItem value="acom">ACOM</SelectItem>
+                        <SelectItem value="acom">Acom</SelectItem>
                         <SelectItem value="kpa">Elecraft</SelectItem>
                       </SelectContent>
                     </Select>
@@ -4314,10 +4315,15 @@ function SettingsModalImpl({ onClose, onSaved, initialSection, onMainPaneChanged
                 )}
 
                 {/* Band-follow, for any amp that takes its band from a transceiver
-                    CAT link (ACOM and SPE both do) — never PowerGenius, which is
+                    CAT link (Acom and SPE both do) — never PowerGenius, which is
                     driven over its network protocol. A SECOND serial port,
-                    separate from the metering one above. */}
-                {!isPGXL && (
+                    separate from the metering one above.
+                    Never a KPA either: it has a band command of its own (^BN),
+                    so OpsLog tells it directly on the link it is already using.
+                    Offering a second serial port and a transceiver emulator for
+                    that would be a workaround for a problem this amplifier does
+                    not have. */}
+                {!isPGXL && !isKPA && (
                   <div className="border-t border-border/60 pt-3 space-y-3">
                     <label className="flex items-center gap-2 text-sm cursor-pointer">
                       <Checkbox