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.

docs/smoke-checklist.md

@@ -40,3 +40,5 @@
 38. Master/SFX/ambience volume settings clamp at 0/1 and persist; Reduce motion disables head bob; the captions toggle persists.
 39. The 24-NPC budget smoke stays inside its frame budget; coats/dresses do not show obvious leg clipping in a normal walk.
 40. Help remains readable with the largest HUD font scale, and CI/local verification use the same Godot 4.7.2 baseline.
+41. UI copy: inspection/wand use "A = admit · D = refuse entry", review returns with "Return to menu", and application exit reads "Quit game".
+42. Button states remain readable on hover/focus/pressed; settings Apply/Cancel and radio normal-send/emergency-hold behave as labelled.