feat: control the 4O3A Tuner Genius XL directly over TCP (port 9010)

New internal/tunergenius client speaking the same "Genius Series" text API
as the Antenna Genius / PowerGenius XL: banner on connect (with optional
"AUTH" for remote access), "C<seq>|<cmd>\n" commands, "R<seq>|<code>|<msg>"
replies and the "S<seq>|status k=v …" snapshot; async "M|<msg>" info lines
are consumed inline. Polls status ~1.5s and exposes SWR (return-loss dB
converted to a VSWR ratio), forward power (dBm→W), and the operate/bypass/
tuning/active-channel state. Actions: autotune, global bypass, operate/standby.

Controlled directly (not via the radio) so OpsLog uses only one of the box's
four connection slots, per the device's protocol doc.

Wiring:
- app.go: tunergenius.* settings keys, Get/Save/start, GetTunerGeniusStatus,
  TunerGeniusAutotune/SetBypass/SetOperate; started in the background at launch.
- Settings → Tuner Genius panel (enable + IP + optional remote code).
- Docked TunerGeniusPanel widget (SWR/power readouts + Tune/Bypass/Operate),
  top-bar toggle, shown when enabled — mirrors the Antenna Genius widget.
- i18n EN/FR (sec.tunergenius, tg2.*, tgp.*).

Command verbs (operate/bypass/autotune/status/auth) come straight from the
4O3A "Tuner Genius XL — Protocol Description"; UNTESTED on hardware.

changelog.json

@@ -3,6 +3,7 @@
     "version": "0.21.1",
     "date": "2026-07-24",
     "en": [
+      "New: 4O3A Tuner Genius XL control. Enable it in Settings → Tuner Genius (IP only; port is fixed at 9010), then a docked widget shows live SWR and forward power with Tune, Bypass and Operate/Standby buttons. Controlled directly over TCP, so it uses just one of the box's connection slots.",
       "Fixed the colour theme sometimes reverting to the default when reopening OpsLog — it's now restored reliably.",
       "ADIF export field picker: the per-group All / None buttons work again.",
       "Station Control: cards now pack tightly into balanced columns instead of leaving big gaps under shorter panels — a cleaner, more even dashboard.",
@@ -11,6 +12,7 @@
       "Fixed award references (in the entry strip's Awards tab) not clearing when the callsign changes — clicking one spot then another no longer keeps the previous station's references."
     ],
     "fr": [
+      "Nouveau : contrôle du 4O3A Tuner Genius XL. Active-le dans Réglages → Tuner Genius (IP seulement ; port fixé à 9010), un widget ancré affiche alors le ROS et la puissance directe en direct avec les boutons Accord, Bypass et Operate/Standby. Piloté directement en TCP, il n'utilise qu'une des connexions de la boîte.",
       "Correction du thème qui revenait parfois au défaut à la réouverture d'OpsLog — il est maintenant restauré de façon fiable.",
       "Sélecteur de champs à l'export ADIF : les boutons Tout / Aucun par groupe refonctionnent.",
       "Station Control : les cartes se rangent en colonnes équilibrées et se tassent au lieu de laisser de gros trous sous les panneaux plus courts — tableau de bord plus propre et régulier.",