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.

scripts/qa-radio.mjs

@@ -2159,7 +2159,7 @@ async function main() {
         recordLayoutStep();
         if (index < 4) {
           if (index < 2) {
-            hudLayout.value = index === 0 ? 'operator' : 'minimal';
+            hudLayout.value = index === 0 ? 'minimal' : 'tactical';
             hudLayout.dispatchEvent(new Event('change', { bubbles: true }));
           } else {
             hudToggle.click();