fix(flex): link TX/RX collapse, equal-size meters, phone-only MIC/COMP, inline S-meter dBm

FlexRadio panel refinements from feedback:
- TRANSMIT and RECEIVE now share one collapse state — folding either folds both
  (Card gained an optional controlled open/onToggle mode; the parent owns the
  shared txrx state, persisted).
- Meter sizes: the Tuner Genius PWR/SWR meters used a 2-column grid (wider than
  the Flex/amp meters). Switched to the same grid-cols-2 sm:grid-cols-3 so every
  meter across the METERS, AMPLIFIER and TUNER cards is the same width.
- MIC and COMP meters are hidden outside phone modes (shown for SSB/AM/FM only).
- S-meter dBm moved inline next to the S-value (was a second line under the bar),
  and the redundant dBm line under PWR removed — keeps only the watts. Saves height.

frontend/src/components/TunerCard.tsx

@@ -149,8 +149,8 @@ export function TunerCard({ status, t }: { status: TGStatus; t: (k: string, v?:
               onSelect={() => TunerGeniusActivate(2).catch(() => {})} t={t} />
           </div>
 
-          {/* PWR + SWR meters. */}
-          <div className="grid grid-cols-2 gap-2">
+          {/* PWR + SWR meters — same grid as the Flex/amp meters so they match size. */}
+          <div className="grid grid-cols-2 sm:grid-cols-3 gap-2">
             <MeterBar label={t('tgp.power')} value={fwdW} unit="W" lo={0} hi={2000}
               display={fwdW >= 1 ? `${Math.round(fwdW)} W` : '—'}
               segColor={(f) => (f > 0.9 ? '#dc2626' : f > 0.75 ? '#f59e0b' : '#ea580c')} />