Standardize button labels and document UI states

Finish the button-label audit with a surface-by-surface table, clarify Quit
game vs Quit to menu, rename Apply to Apply settings, and use string-table
keys for the new labels. Extend the smoke checklist with UI copy/button checks.
Headless 250/250, docs check OK.

TODO.md

@@ -57,8 +57,9 @@ screen-design judge before any model/texture changes. No gameplay rules change.
 - [x] Record the canonical terms for admit/refuse, warning/blocking,
       assistance/emergency, body camera, shift review and campaign; the current
       inspection/wand/radio/review labels use them (see `docs/ui-copy.md`).
-- [ ] Audit all button labels for verb-first wording, capitalization, ordering,
-      destructive-action confirmation and consistent confirm/cancel placement.
+- [x] Audit all button labels for verb-first wording, capitalization, ordering,
+      destructive-action confirmation and consistent confirm/cancel placement;
+      recorded in `docs/ui-copy.md` and fixed Quit/Apply wording.
 - [ ] List every hardcoded player-facing string and route it through
       `content/strings.en.json`; add placeholder validation for new keys.
 - [ ] Review NPC/door-staff/radio/tutorial/help/review/campaign dialogue for