fix(icom): needle inertia for the TX meters, and room for three digits

The CI-V meters are point samples: between two SSB syllables a poll lands on
0 W and a perfect SWR, so a 150 W transmission read 0-10 W most of the time
and the SWR sat at 1.0. Power now decays like a needle and SWR holds its peak
then snaps to the live value — the same meterPeak the Yaesu and Kenwood
consoles already use. The readout column also widens so '180 W' stays on one
line.

changelog.json

@@ -32,7 +32,8 @@
       "Icom console: the MOX button carries your microphone on a network station, and engaging split aligns the TX VFO’s mode with the main.",
       "Icom console: the spectrum scope is removed. Every model streams its waveform differently — and on the IC-7760 enabling it killed the whole CI-V link, audio included. The radio’s own scope does it better.",
       "Icom: any leftover waveform stream is switched off at connect — the scope flag lives in the radio and survived sessions, and its flood is what was killing the IC-7760’s CI-V link.",
-      "Icom console: an ATU chip beside SPLIT engages or DISENGAGES the internal tuner — TUNE started a cycle but could never take the tuner back out of line."
+      "Icom console: an ATU chip beside SPLIT engages or DISENGAGES the internal tuner — TUNE started a cycle but could never take the tuner back out of line.",
+      "Icom console: the TX meters get needle inertia — power holds its peak instead of flickering to 0 W between syllables, SWR shows the real peak then returns to the live value — and the wattage readout no longer wraps at three digits."
     ],
     "fr": [
       "Console Elecraft : le S-mètre est calibré sur un vrai K3 — S9 et les +dB correspondent désormais à l’affichage de la radio (il lisait environ deux points S trop bas).",
@@ -64,7 +65,8 @@
       "Console Icom : le bouton MOX emporte votre micro sur une station réseau, et activer le split aligne le mode du VFO TX sur le main.",
       "Console Icom : le scope spectral est retiré. Chaque modèle streame sa forme d’onde différemment — et sur l’IC-7760 son activation tuait tout le lien CI-V, audio compris. Le scope de la radio fait ça mieux.",
       "Icom : tout flux waveform résiduel est coupé à la connexion — le drapeau scope vit dans la radio et survivait aux sessions, et son flot est ce qui tuait le lien CI-V de l’IC-7760.",
-      "Console Icom : une puce ATU à côté de SPLIT engage ou DÉSENGAGE le tuner interne — TUNE lançait un cycle mais ne pouvait jamais remettre le tuner hors ligne."
+      "Console Icom : une puce ATU à côté de SPLIT engage ou DÉSENGAGE le tuner interne — TUNE lançait un cycle mais ne pouvait jamais remettre le tuner hors ligne.",
+      "Console Icom : les mètres TX gagnent une inertie d’aiguille — la puissance tient sa crête au lieu de retomber à 0 W entre les syllabes, le ROS montre la vraie crête puis revient à la valeur vive — et l’affichage en watts ne passe plus à la ligne à trois chiffres."
     ]
   },
   {

frontend/src/components/IcomPanel.tsx

@@ -270,7 +270,7 @@ function Meter({ label, value, accent, scale, onClick, title }: { label: string;
       <div className="flex-1 h-2.5 rounded-full bg-muted/60 overflow-hidden">
         <div className="h-full rounded-full transition-[width] duration-150" style={{ width: `${v}%`, background: accent }} />
       </div>
-      <span className="w-10 text-right text-[11px] font-mono tabular-nums text-muted-foreground">{scale ?? v}</span>
+      <span className="w-14 shrink-0 whitespace-nowrap text-right text-[11px] font-mono tabular-nums text-muted-foreground">{scale ?? v}</span>
     </>
   );
   if (onClick) {

internal/cat/icomserial.go

@@ -116,6 +116,12 @@ type IcomSerial struct {
 	//                       "alive but silent" tolerance below, which used to be
 	//                       unbounded and left the display frozen for ever
 	silentGrace time.Duration // current width of that tolerance (backs off, see ReadState)
+	// Needle inertia for the TX meters — the CI-V meters are point samples, and
+	// between two SSB syllables a poll lands on 0 W and a perfect SWR. See
+	// meterPeak (yaesu_panel.go): power decays like a needle, SWR holds then
+	// snaps back to the live truth.
+	powerPeak meterPeak
+	swrPeak   meterPeak
 	dspLoaded bool // readDSP has run since the rig became responsive (loads all
 	//                     the panel's set-once controls once the rig actually answers)
 	// When the console last asked for the DSP snapshot. The meters and the
@@ -456,12 +462,16 @@ func (b *IcomSerial) ReadState() (RigState, error) {
 		sm, _ = b.readMeter(civ.SubMeterS)
 		po, swr = 0, 0
 		if tx {
+			now := time.Now()
 			if v, ok := b.readMeter(civ.SubMeterPo); ok {
-				po = v
+				po = b.powerPeak.update(v, now)
 			}
 			if v, ok := b.readMeter(civ.SubMeterSWR); ok {
-				swr = v
+				swr = b.swrPeak.updateSnap(v, now)
 			}
+		} else {
+			// Cleared with the carrier, so the next transmission starts fresh.
+			b.powerPeak, b.swrPeak = meterPeak{}, meterPeak{}
 		}
 	}
 	b.dspMu.Lock()