feat: a level control for the voice keyer, and name every CAT backend in its PTT list

The messages went to the radio exactly as recorded. Nothing in OpsLog could
raise them, so a microphone captured quietly drove the rig quietly and the only
remedies were the radio's own USB input menu or the Windows mixer — which is
where the operator was heading. There is now a level from 10 to 400 %, applied
with clamping (a wrap would turn loud speech into noise on the air), and Play
previews at that same level so the adjustment is made against what will actually
be transmitted.

The PTT method list also named only OmniRig, Flex, Icom and TCI, so choosing a
native Yaesu left "CAT" with no backend beside it — which reads as "there is no
CAT PTT for my radio" and sends the operator to RTS on a COM port that has
nothing to do with the rig. Same list-needing-every-member shape as three
earlier bugs in this feature. The TestPTT log line had the same rot: it said
"CAT via OmniRig" whatever backend was running.

changelog.json

@@ -3,6 +3,8 @@
     "version": "0.21.9",
     "date": "2026-07-28",
     "en": [
+      "The voice keyer PTT list now names the Yaesu and Xiegu backends too — with a native backend selected it showed no CAT name, which read as \"CAT PTT is not available for my radio\".",
+      "Voice keyer: a level control for the messages sent to the radio (Settings → Audio). They went out exactly as recorded, so a quietly recorded microphone drove the rig quietly with nothing in OpsLog to fix it. Play previews at the same level.",
       "Yaesu console meters are right: power now reads the meter that follows the RF (in watts, on a curve measured against the rig own display, not the power setting) and SWR shows the ratio itself. Both were reading the wrong index — the SWR bar sat near 80 on a perfect match. The bars also hold their peak for a moment before falling back, so they stay readable through the gaps between words in a CQ, in CW as in SSB.",
       "CW speed is now one setting wherever you change it: the Yaesu console slider and the CW panel drive the keyer that is actually sending, and the rig own keyer follows so its front panel agrees.",
       "Antenna Genius: port A no longer jumps onto port B antenna a few seconds after a change. Only one port can hold the transmit antenna, so the switch reports the same one on both — the display now follows each port own receive antenna.",
@@ -21,6 +23,8 @@
       "CQ and ITU zones you correct by hand in your profile stay corrected. They are derived from cty.dat, which gives the zones of the whole entity — in a country spanning several, the automatic value is wrong and it came back at every restart. They now only fill in when empty, and recompute when the callsign or grid changes."
     ],
     "fr": [
+      "La liste PTT du voice keyer nomme aussi les backends Yaesu et Xiegu — avec un backend natif sélectionné, aucun nom de CAT n'apparaissait, ce qui se lisait « il n'y a pas de PTT CAT pour ma radio ».",
+      "Voice keyer : un réglage de niveau pour les messages envoyés à la radio (Réglages → Audio). Ils partaient exactement tels qu'enregistrés : un micro capté faiblement attaquait donc la radio faiblement, sans rien dans OpsLog pour y remédier. Le bouton Lire fait entendre ce même niveau.",
       "Les mesures de la console Yaesu sont justes : la puissance lit l'instrument qui suit la HF (en watts, sur une courbe relevée face à l'affichage de la radio, et non le réglage de puissance) et le ROS affiche le rapport lui-même. Les deux lisaient le mauvais index — la barre de ROS restait vers 80 sur une antenne parfaite. Les barres retiennent aussi leur crête un instant avant de redescendre : elles restent lisibles pendant les silences entre les mots d’un CQ, en CW comme en phonie.",
       "La vitesse CW est désormais un réglage unique où que vous la changiez : le curseur de la console Yaesu et le panneau CW pilotent le manipulateur qui émet réellement, et le keyer interne de la radio suit pour que sa façade affiche la même valeur.",
       "Antenna Genius : le port A ne bascule plus sur l'antenne du port B quelques secondes après un changement. Un seul port peut porter l'antenne d'émission, le switch renvoie donc la même sur les deux — l'affichage suit désormais l'antenne de réception propre à chaque port.",