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/ui/applicationShell.js

@@ -1337,7 +1337,7 @@ export class StyleManager extends ShellFacade {
 
   /**
    * Switches the HUD layout variant.
-   * @param {'tactical'|'operator'|'minimal'|'cyber'} variantName - Layout variant.
+   * @param {'tactical'|'minimal'|'cyber'} variantName - Layout variant.
    * @returns {{ok: boolean, layout?: string, visible?: boolean, error?: string}}
    */
   setHudLayout(variantName) {