Remove the Operator HUD layout

Display > HUD > Layout and the set_hud voice action now offer Tactical,
Minimal and Cyber. The Operator option, its CSS and its QA coverage are
removed, and the unused "Operator" translations are pruned.

Share-link codes are append-only, so operator keeps its hudVariant code.
A link, scene or saved state that names it restores the default Tactical
layout. The voice schema pins keep their legacy digests by restoring the
retired value before comparing; the full-payload digest is re-derived.

src/i18n/locales/es.json

@@ -76,7 +76,6 @@
   "Layout": "Disposición",
   "HUD layout": "Disposición del HUD",
   "Tactical": "Táctica",
-  "Operator": "De operador",
   "Minimal": "Mínima",
   "Detection Overlay (D)": "Superposición de detección (D)",
   "Detection overlay": "Superposición de detección",