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/cyberPanelDisclosure.test.mjs

@@ -72,7 +72,7 @@ test('opening already-expanded Radio reveals Context and closes Display', () =>
 });
 
 test('non-Cyber explicit panels and restored preferences retain their existing policy', () => {
-  for (const theme of ['tactical', 'operator', 'minimal', 'cyber']) {
+  for (const theme of ['tactical', 'minimal', 'cyber']) {
     const f = fixture(theme), prior = globalThis.document;
     globalThis.document = f.doc;
     try {