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.

TODO.md

@@ -7,7 +7,7 @@ see `AGENTS.md` for the workflow and `MEMORY.md` for the decisions behind these
 
 Baseline: **v0.9.2** (2026-11-02). Three playable venues, tutorial/campaign/checkpoint resume,
 difficulty/help, audio/accessibility settings, a 24-NPC budget baseline, a complete
-escalation/access/radio loop, shift review, the Blender asset library, 259 headless + 97 Python
+escalation/access/radio loop, shift review, the Blender asset library, 260 headless + 97 Python
 tests, a clean screen-design judge and an optional Forward+ Desktop HQ build. This is a strong
 release-candidate foundation, not yet a 0.10.0 release candidate.
 
@@ -81,8 +81,10 @@ screen-design judge before any model/texture changes. No gameplay rules change.
       radio send/emergency hold and Help close. (Shared `UiStyles` states applied;
       timeline boundary disabling and the keyboard-only F1 skip are documented in
       `docs/ui-copy.md`.)
-- [ ] Verify keyboard-only and gamepad-only navigation: focus order, wrapping,
-      default focus, confirm/cancel behavior and no focus traps.
+- [x] Verify keyboard-only and gamepad-only navigation: focus order, wrapping,
+      default focus, confirm/cancel behavior and no focus traps. (Focus rings,
+      gamepad A/B UI bindings, default focus and per-modal cancel behavior are
+      recorded in `docs/ui-copy.md`.)
 - [ ] Verify every modal closes with Esc/right-click where documented, recaptures
       the mouse, and does not leave the guard frozen or the menu visible.
 - [ ] Test buttons at minimum/maximum HUD font scale and with 1.5–2× longer