Add wrapping keyboard and gamepad focus rings

- Link every modal's enabled controls into a wrapping UiFocus ring and give each screen a default focus target.
- Add gamepad A/B bindings for ui_accept/ui_cancel; include Start menu footer actions and Continue in its focus ring.
- Skip hidden/disabled controls, close focus traps via per-modal cancel behavior, and return review to the menu on cancel.
- Record the focus audit and add regression coverage.

CHANGELOG.md

@@ -11,6 +11,9 @@ Semantic Versioning.
 - All session, settings, radio, Help, review and timeline action buttons now
   share explicit normal, hover, pressed, focus and disabled styles. Timeline
   Previous/Next disable at their boundaries.
+- Keyboard and gamepad focus rings now wrap through every modal, with explicit
+  default focus and A/B accept/cancel bindings; hidden Continue and disabled
+  timeline controls are skipped.
 - NPC reason answers now use role-specific dialogue contexts, so staff, guests,
   delivery workers, performers and other archetypes answer instead of silently
   deflecting the Reason verb.