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.

src/test/tests/test_player_movement.gd

@@ -43,6 +43,7 @@ func test_gamepad_bindings_are_added_once() -> bool:
 		if InputMap.action_get_deadzone(action) > 0.25:
 			problems.append("%s deadzone too high" % action)
 	var buttons := {"action_menu": JOY_BUTTON_A, "cancel": JOY_BUTTON_B,
+		"ui_accept": JOY_BUTTON_A, "ui_cancel": JOY_BUTTON_B,
 		"inspect": JOY_BUTTON_X, "walk_slow": JOY_BUTTON_LEFT_SHOULDER}
 	for action in buttons.keys():
 		var found := false