fix(a11y): names that carry what they show; the unused-key check stops covering whole files

- The palette launcher's name replaced its visible "Jump to…" (and the key cap's its "Ctrl K"):
  a voice-control "click Jump to" matched nothing (WCAG 2.5.3). Each name contains its text now.
- SegmentedToggle's `title` was only a tooltip on a non-focusable box — the live search's "how
  many per batch" hint reached no keyboard or screen-reader user. It is the group's accessible
  description, standalone and captioned alike.
- The unused-key contract let a template like `card.${status}` cover its whole namespace, which hid
  five dead keys (deleted). Dynamic keys are matched by shape (`editor.*.hint`); a bare namespace
  shape covers nothing, and the audit/quota namespaces are now held both ways by backendIds.
- CLAUDE.md's "FE control" row matches the lint rule it cites; each no-restricted-syntax entry has
  its reason directly above it.

frontend/src/i18n/locales/hu/editor.json

@@ -1,15 +1,11 @@
 {
   "title": "Szerkesztés: „{{name}}”",
   "playPause": "Lejátszás / szünet",
-  "setIn": "Kezdet itt",
-  "setOut": "Vég itt",
   "in": "Kezdet",
   "out": "Vég",
-  "selected": "Kijelölés",
   "cropOff": "Vágókeret",
   "cropOn": "Vágókeret bekapcsolva",
   "cropReencode": "A vágókeret mindig újrakódol (frame-pontos).",
-  "split": "Feldarabolás",
   "accurate": {
     "label": "Pontos vágás",
     "hint": "Frame-pontos. Újrakódolja a klipet."