feat(icom): a speaker toggle on the console itself

Muting the network RX audio took a trip through Settings → Audio → Stop
listening — two panels away from the console the operator is actually using.
A speaker button now sits beside ON/OFF (network only, like them): one click
to listen or mute, the recorder and the voice keyer unaffected, the choice
remembered across reconnects and launches.

frontend/src/components/IcomPanel.tsx

@@ -1,9 +1,10 @@
 import { useEffect, useRef, useState } from 'react';
-import { Radio, AudioLines, Mic, Activity, SlidersHorizontal, Antenna, Filter, Power } from 'lucide-react';
+import { Radio, AudioLines, Mic, Activity, SlidersHorizontal, Antenna, Filter, Power, Volume2, VolumeX } from 'lucide-react';
 import {
   GetIcomState, IcomRefresh,
   IcomSetAFGain, IcomSetRFGain, IcomSetNB, IcomSetNBLevel, IcomSetNR, IcomSetNRLevel,
   IcomSetANF, IcomSetAPF, IcomSetAGC, IcomSetPreamp, IcomSetAtt, IcomSetFilter,
+  AudioMonitorActive, AudioStartMonitor, AudioStopMonitor,
   IcomSetRFPower, IcomSetMicGain, IcomSetSplit, IcomTune, IcomSetPTT,
   IcomSetScope, IcomScopeData, IcomSetScopeMode, IcomSetScopeEdges, GetCATState, SetCATFrequency, SetCATMode,
   IcomSetRIT, IcomSetRITOn, IcomSetXITOn,
@@ -596,6 +597,23 @@ function ScopePanadapter() {
 // read every cache cycle; DSP set-controls are optimistic and reconcile on the
 // next poll. Front-panel knob changes for DSP show after ↻ Refresh.
 export function IcomPanel({ onReportRST, isNetwork = false }: { onReportRST?: (rst: string) => void; isNetwork?: boolean } = {}) {
+  // The speaker toggle lives HERE, next to ON/OFF, because that is where the
+  // operator is looking — burying "stop listening" behind Settings → Audio
+  // meant a trip through two panels to mute a radio sitting in the same room.
+  const [listening, setListening] = useState(false);
+  useEffect(() => {
+    if (!isNetwork) return;
+    let alive = true;
+    const ask = () => AudioMonitorActive().then((v) => { if (alive) setListening(!!v); }).catch(() => {});
+    ask();
+    const id = window.setInterval(ask, 2000);
+    return () => { alive = false; window.clearInterval(id); };
+  }, [isNetwork]);
+  const toggleListening = () => {
+    const next = !listening;
+    setListening(next);
+    (next ? AudioStartMonitor() : Promise.resolve(AudioStopMonitor())).catch(() => setListening(!next));
+  };
   const { t } = useI18n();
   const [st, setSt] = useState<IcomState>(ZERO);
   const [cat, setCat] = useState<any>(null); // RigState (freq/mode/split) for the VFO display
@@ -704,6 +722,14 @@ export function IcomPanel({ onReportRST, isNetwork = false }: { onReportRST?: (r
               rig's LAN server stays alive in standby, so both work. */}
           {isNetwork && (
             <>
+              <button type="button" onClick={toggleListening}
+                title={listening ? t('icmp.speakerOffHint') : t('icmp.speakerOnHint')}
+                className={cn('inline-flex items-center gap-1 rounded-md border px-2 py-1 text-xs font-bold',
+                  listening
+                    ? 'border-primary/60 bg-primary/10 text-primary hover:bg-primary/20'
+                    : 'border-border bg-card text-muted-foreground hover:bg-muted')}>
+                {listening ? <Volume2 className="size-3.5" /> : <VolumeX className="size-3.5" />}
+              </button>
               <button type="button" onClick={() => IcomSetPower(true).catch(() => {})} title={t('icmp.powerOnHint')}
                 className="inline-flex items-center gap-1 rounded-md border border-success/60 bg-success/10 px-2 py-1 text-xs font-bold text-success hover:bg-success/20">
                 <Power className="size-3.5" /> ON