Settings page: ON/OFF switches everywhere, the Auto switch screen, a Companion button picker

- ON/OFF on every key, check, fix, Restart and READY key, computer, MIDI link, HyperDeck,
  Dante device, watched Companion connection, switcher and Spotify check, outlet fix, and one
  main switch each for auto-fix, the auto switch and the READY page. Switched off = kept in
  the settings, grey OFF on the deck, never checked or run (effective_config in the watchdog).
- Settings › Auto switch: a plain summary, what counts as down (each trigger editable in place:
  address, program and computer, Dante device, the button it presses, timings), the hours
  folded away, the buttons; + Button, + What counts as down, Remove.
- Pick a Companion button by clicking it on its page, drawn like Companion (read-only API:
  /api/companion/pages and /api/companion/page).
- STREAM STB / STREAM FOH Restart keys removed (the Studio B page has its own); the alert names
  the switch-back button instead.
- Dante screen: shows the DANTE key's device list again (it picked STB AUDIO's one device).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

settings/ui/style.css

@@ -137,3 +137,18 @@ details.script textarea { width: 100%; font-size: .8rem; }
 .checks { margin-top: 8px; }
 .chkgroup { margin: 10px 0 2px; font-size: .78rem; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); }
 .chk { margin: 3px 0; }
+
+#dialog .box.wide { max-width: min(760px, 96vw); width: 760px; }
+.cp-deck { max-width: 100%; margin: 6px 0; }
+.cp-deck .key { cursor: pointer; font-size: .62rem; text-shadow: 0 0 2px #000; }
+.cp-deck .key.cp-key:hover { border-color: #9be7a6; }
+.cp-deck .key.sel { border-color: #fff; box-shadow: 0 0 0 2px #2ecc71; }
+.trig { border-top: 1px solid var(--line); padding: 10px 0 4px; }
+.trig:first-of-type { border-top: 0; }
+
+.onoff { display: inline-flex; align-items: center; cursor: pointer; vertical-align: middle; user-select: none; }
+.onoff input { display: none; }
+.onoff span { font: 700 .62rem/1 var(--font); letter-spacing: .04em; padding: 4px 8px; border-radius: 999px; background: #4a4f4c; color: #cfd3d1; min-width: 2.6em; text-align: center; }
+.onoff.on span { background: #1f8f4e; color: #fff; }
+.onoff input:disabled + span { opacity: .75; cursor: default; }
+tr.off td, .trig.off, .key.off { opacity: .55; }