feat(station): the radio and both keyers on the Station Control tab

This tab began as the relay and rotator dashboard and stopped there: the
three things an operator touches most — the radio, the CW keyer, the
voice keyer — were the ones missing from the page that claims to show the
station.

The radio card carries the frequency and the mode large, because that is
what gets glanced at, and the split pair only when there IS a split: a
second frequency shown at all times is one more number to read past. When
CAT is down it says which kind of down — switched off, or on and not
answering.

The CW keyer card carries the speed, which is the control an operator
reaches for mid-QSO when a station comes back faster than expected, and
Stop beside it because a message going to the wrong callsign has to end
now. The voice keyer card carries the recorded messages themselves: a
card that only said "idle" would be a light, not a control.

Each polls its own binding and holds its own state, like the supply card
above them, so they drop into the grid and reorder with everything else.
The two keyers appear only when there is something behind them — a port
configured, a message actually recorded — because an operator who works
neither should not be handed two dead cards. That question is asked once
on opening the tab: a keyer is bought and wired, not something that
appears mid-session.

changelog.json

@@ -1,4 +1,14 @@
 [
+  {
+    "version": "0.27.18",
+    "date": "",
+    "en": [
+      "Station Control shows what commands the station, not only what it switches. The radio is there now — frequency, mode, band, and the split pair when there is one — with the CW keyer beside it (speed up and down, and Stop, because a message going to the wrong callsign has to end now) and the voice keyer with its recorded messages as buttons, so a CQ goes out without leaving the tab. The two keyers appear only when there is something behind them: a port configured, or a message actually recorded. All three move and reorder with the other cards."
+    ],
+    "fr": [
+      "Contrôle station montre ce qui commande la station, et plus seulement ce qui la commute. La radio y figure désormais — fréquence, mode, bande, et le couple split quand il y en a un — avec à côté le manipulateur CW (vitesse en plus ou en moins, et Stop, parce qu'un message parti vers le mauvais indicatif doit s'arrêter tout de suite) et le manipulateur vocal avec ses messages enregistrés en boutons, pour lancer un CQ sans quitter l'onglet. Les deux manipulateurs n'apparaissent que s'il y a quelque chose derrière : un port configuré, ou un message réellement enregistré. Les trois se déplacent et se réordonnent avec les autres cartes."
+    ]
+  },
   {
     "version": "0.27.17",
     "date": "",