feat: Tuner Genius XL — A/B channels, plus FlexRadio panel + Station Control cards

Push the tuner control further so it mirrors the native 4O3A app and the way the
PowerGenius XL is surfaced.

Backend (internal/tunergenius):
- Status now carries both RF channels A and B (source/mode, band, frequency,
  bound Flex nickname, per-channel bypass, antenna, PTT), the active channel,
  the C1/L/C2 relay-network positions, and the 3-way-vs-SO2R hardware variant
  (learned once from the `info` reply). Flat freq/antenna still mirror the active
  channel for the compact widget.
- New TunerGeniusActivate(ch) binding → `activate ch=N` (or `ant=N` on 3-way).

Frontend:
- New shared TunerCard, styled exactly like AmpCard (PWR/SWR meter bars,
  A/B channel selector with source+freq+antenna, Tune/Bypass/Operate). Used in
  BOTH the FlexRadio panel (its own card, like the PGXL) and Station Control.
- Docked TunerGeniusPanel widget now shows the two channels A/B with their
  source/frequency/antenna and lets you click to make one active — the missing
  A/B state the user flagged.
- i18n EN/FR for the new labels (channels, antenna, in-line/bypassed, title).

Still UNTESTED on hardware — verify the per-channel field names/units and the
activate behaviour on the real box.

frontend/src/lib/i18n.tsx

@@ -333,6 +333,7 @@ const en: Dict = {
   'dvkp.voiceKeyer': 'Voice keyer', 'dvkp.autoCq': 'Auto CQ', 'dvkp.autoCqHint': 'Repeat a CQ-labelled message on a timer until you stop it or play another slot', 'dvkp.gap': 'Gap', 'dvkp.notPhone': 'The voice keyer only transmits on a phone mode (SSB/AM/FM)', 'dvkp.stop': 'Stop', 'dvkp.disable': 'Disable voice keyer', 'dvkp.noMsgPre': 'No messages recorded yet. Open', 'dvkp.settingsPath': 'Settings → Audio devices & voice keyer', 'dvkp.noMsgPost': 'to record F1–F6.', 'dvkp.transmit': 'Transmit F{slot}{label} ({dur}s)', 'dvkp.empty': 'F{slot} — empty', 'dvkp.message': 'message',
   'agp.portDeselect': 'Port {letter} — click to deselect', 'agp.portSelect': 'Select on port {letter}', 'agp.online': 'online', 'agp.offline': 'offline', 'agp.close': 'Close', 'agp.connecting': 'Connecting…', 'agp.noAntennas': 'No antennas configured.', 'agp.filterOnHint': 'Showing antennas for {band} only — click to show all bands', 'agp.filterOffHint': 'Showing all antennas — click to show only the current band',
   'tgp.online': 'online', 'tgp.offline': 'offline', 'tgp.close': 'Close', 'tgp.connecting': 'Connecting…', 'tgp.swr': 'SWR', 'tgp.power': 'Fwd power', 'tgp.tune': 'Tune', 'tgp.tuning': 'Tuning…', 'tgp.tuneHint': 'Start an automatic tuning cycle on the active channel — key the rig into a carrier so the tuner can measure SWR', 'tgp.bypass': 'Bypass', 'tgp.bypassHint': 'Toggle global bypass — route the antenna straight through, tuner out of line', 'tgp.operate': 'Operate', 'tgp.standby': 'Standby', 'tgp.operateHint': 'Toggle Operate / Standby',
+  'tgp.title': 'Tuner Genius', 'tgp.chActive': 'Channel {letter} — active', 'tgp.chSelect': 'Make channel {letter} active', 'tgp.chActiveTag': 'active', 'tgp.ant': 'Ant', 'tgp.bypassed': 'Bypassed', 'tgp.inLine': 'In line',
   'flxp.ritHint': 'RIT — shifts your RECEIVE frequency only. Wheel, ± or arrow keys to adjust (Ctrl = 100 Hz). The offset is kept when you switch it off.', 'flxp.xitHint': 'XIT — shifts your TRANSMIT frequency only. Wheel, ± or arrow keys to adjust (Ctrl = 100 Hz). The offset is kept when you switch it off.',
   'flxp.smartsdrRemote': 'SmartSDR remote control', 'flxp.offline': 'OFFLINE', 'flxp.waiting': 'Waiting for the FlexRadio… (set CAT to FlexRadio and connect)', 'flxp.transmit': 'Transmit', 'flxp.rfPower': 'RF Power', 'flxp.tunePwr': 'Tune Pwr', 'flxp.splitHint': 'Split: RX/TX on separate slices. ON creates a TX slice +1 kHz (CW) / +5 kHz (SSB) up, like SmartSDR.', 'flxp.sliceHint': 'Click to make this the active slice — frequency, mode, DSP and spot-clicks all follow it.', 'flxp.txSlice': 'This slice transmits', 'flxp.setTxSlice': 'Move TX to this slice (transmit here)', 'flxp.voxDly': 'VOX Dly', 'flxp.speed': 'Speed', 'flxp.pitch': 'Pitch', 'flxp.delay': 'Delay',
   'flxp.receiveActive': 'Receive (active slice)', 'flxp.muted': 'Muted — click to unmute', 'flxp.mute': 'Mute RX audio', 'flxp.filter': 'Filter', 'flxp.amplifier': 'Amplifier', 'flxp.ampInLine': 'Amplifier is in line (transmitting through PA).', 'flxp.ampBypassed': 'Amplifier bypassed (standby).', 'flxp.pgConnected': 'PowerGenius connected', 'flxp.pgOffline': 'PowerGenius offline', 'flxp.fan': 'Fan', 'flxp.fanStandard': 'Standard', 'flxp.fanContest': 'Contest', 'flxp.fanBroadcast': 'Broadcast', 'flxp.fault': 'FAULT', 'flxp.meters': 'Meters', 'flxp.voltage': 'VOLTAGE', 'flxp.paTemp': 'PA TEMP', 'flxp.txFilter': 'TX filter', 'flxp.micProfile': 'Mic profile', 'flxp.noMeters': "No meters yet — waiting for the radio's UDP stream…", 'flxp.amplifierHdr': 'AMPLIFIER', 'flxp.outputPower': 'OUTPUT POWER', 'flxp.speOffline': 'SPE offline', 'flxp.acomOffline': 'ACOM offline', 'flxp.ampPick': 'Choose which amplifier this card shows', 'flxp.dspV4Hint': 'SmartSDR v4 DSP (8000/Aurora series)', 'flxp.daxHint': 'DAX as the transmit audio source (SmartSDR transmit-bar DAX button) — for WSJT-X & co', 'flxp.rnnHint': 'RNN — AI noise reduction (on/off)', 'flxp.anftHint': 'ANFT — FFT-based automatic notch filter (on/off)', 'flxp.dspNoise': 'Noise', 'flxp.dspMore': 'Show/hide advanced DSP (WNB, v4 NR/notch)',
@@ -690,6 +691,7 @@ const fr: Dict = {
   'dvkp.voiceKeyer': 'Manipulateur vocal', 'dvkp.autoCq': 'Auto CQ', 'dvkp.autoCqHint': 'Répète un message libellé CQ à intervalle régulier jusqu\'à l\'arrêt ou la lecture d\'un autre slot', 'dvkp.gap': 'Intervalle', 'dvkp.notPhone': 'Le manipulateur vocal n\'émet qu\'en mode phonie (SSB/AM/FM)', 'dvkp.stop': 'Stop', 'dvkp.disable': 'Désactiver le manipulateur vocal', 'dvkp.noMsgPre': 'Aucun message enregistré. Ouvre', 'dvkp.settingsPath': 'Réglages → Périphériques audio & manipulateur vocal', 'dvkp.noMsgPost': 'pour enregistrer F1–F6.', 'dvkp.transmit': 'Émettre F{slot}{label} ({dur}s)', 'dvkp.empty': 'F{slot} — vide', 'dvkp.message': 'message',
   'agp.portDeselect': 'Port {letter} — clic pour désélectionner', 'agp.portSelect': 'Sélectionner sur le port {letter}', 'agp.online': 'en ligne', 'agp.offline': 'hors ligne', 'agp.close': 'Fermer', 'agp.connecting': 'Connexion…', 'agp.noAntennas': 'Aucune antenne configurée.', 'agp.filterOnHint': 'Antennes du {band} uniquement — clic pour afficher toutes les bandes', 'agp.filterOffHint': 'Toutes les antennes affichées — clic pour n’afficher que la bande courante',
   'tgp.online': 'en ligne', 'tgp.offline': 'hors ligne', 'tgp.close': 'Fermer', 'tgp.connecting': 'Connexion…', 'tgp.swr': 'ROS', 'tgp.power': 'Puiss. directe', 'tgp.tune': 'Accord', 'tgp.tuning': 'Accord…', 'tgp.tuneHint': "Lancer un cycle d'accord automatique sur le canal actif — passe la radio en porteuse pour que le coupleur mesure le ROS", 'tgp.bypass': 'Bypass', 'tgp.bypassHint': "Basculer le bypass global — antenne en direct, coupleur hors ligne", 'tgp.operate': 'Operate', 'tgp.standby': 'Standby', 'tgp.operateHint': 'Basculer Operate / Standby',
+  'tgp.title': 'Tuner Genius', 'tgp.chActive': 'Canal {letter} — actif', 'tgp.chSelect': 'Activer le canal {letter}', 'tgp.chActiveTag': 'actif', 'tgp.ant': 'Ant', 'tgp.bypassed': 'Bypass', 'tgp.inLine': 'En ligne',
   'flxp.ritHint': "RIT — décale uniquement ta fréquence de RÉCEPTION. Molette, ± ou flèches pour ajuster (Ctrl = 100 Hz). Le décalage est conservé quand tu l'éteins.", 'flxp.xitHint': "XIT — décale uniquement ta fréquence d'ÉMISSION. Molette, ± ou flèches pour ajuster (Ctrl = 100 Hz). Le décalage est conservé quand tu l'éteins.",
   'flxp.smartsdrRemote': 'Contrôle à distance SmartSDR', 'flxp.offline': 'HORS LIGNE', 'flxp.waiting': 'En attente du FlexRadio… (règle le CAT sur FlexRadio et connecte)', 'flxp.transmit': 'Émission', 'flxp.rfPower': 'Puissance RF', 'flxp.tunePwr': 'Puiss. TUNE', 'flxp.splitHint': 'Split : RX/TX sur des slices séparées. ON crée une slice TX +1 kHz (CW) / +5 kHz (SSB) au-dessus, comme SmartSDR.', 'flxp.sliceHint': 'Cliquer pour rendre cette slice active — fréquence, mode, DSP et clics de spot la suivent tous.', 'flxp.txSlice': 'Cette slice émet', 'flxp.setTxSlice': 'Déplacer le TX sur cette slice (émettre ici)', 'flxp.voxDly': 'Délai VOX', 'flxp.speed': 'Vitesse', 'flxp.pitch': 'Tonalité', 'flxp.delay': 'Délai',
   'flxp.receiveActive': 'Réception (slice active)', 'flxp.muted': 'Coupé — clic pour rétablir', 'flxp.mute': "Couper l'audio RX", 'flxp.filter': 'Filtre', 'flxp.amplifier': 'Amplificateur', 'flxp.ampInLine': 'Amplificateur en ligne (émission via le PA).', 'flxp.ampBypassed': 'Amplificateur en bypass (standby).', 'flxp.pgConnected': 'PowerGenius connecté', 'flxp.pgOffline': 'PowerGenius hors ligne', 'flxp.fan': 'Ventilo', 'flxp.fanStandard': 'Standard', 'flxp.fanContest': 'Contest', 'flxp.fanBroadcast': 'Diffusion', 'flxp.fault': 'DÉFAUT', 'flxp.meters': 'Mesures', 'flxp.voltage': 'TENSION', 'flxp.paTemp': 'TEMP PA', 'flxp.txFilter': 'Filtre TX', 'flxp.micProfile': 'Profil micro', 'flxp.noMeters': 'Aucune mesure — en attente du flux UDP de la radio…', 'flxp.amplifierHdr': 'AMPLIFICATEUR', 'flxp.outputPower': 'PUISSANCE DE SORTIE', 'flxp.speOffline': 'SPE hors ligne', 'flxp.acomOffline': 'ACOM hors ligne', 'flxp.ampPick': 'Choisir quel amplificateur cette carte affiche', 'flxp.dspV4Hint': 'DSP SmartSDR v4 (séries 8000/Aurora)', 'flxp.daxHint': "DAX comme source audio d'émission (bouton DAX du bandeau transmit de SmartSDR) — pour WSJT-X & co", 'flxp.rnnHint': 'RNN — réduction de bruit par IA (on/off)', 'flxp.anftHint': 'ANFT — filtre notch automatique FFT (on/off)', 'flxp.dspNoise': 'Bruit', 'flxp.dspMore': 'Afficher/masquer le DSP avancé (WNB, NR/notch v4)',