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/panelRails.test.mjs

@@ -39,7 +39,7 @@ test('Cyber restores one expanded owner, keeps launchers, and restores other the
       true,
       'layout does not reopen a peer',
     );
-    f.options.hud.variant = 'operator';
+    f.options.hud.variant = 'minimal';
     f.run();
     assert.equal(f.first.classList.contains('collapsed'), false);
     assert.equal(