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/game/ui/radio_panel.gd

@@ -11,6 +11,7 @@ const Rules := preload("res://src/core/rules.gd")
 const Strings := preload("res://src/core/strings.gd")
 const UiArt := preload("res://src/game/ui/art.gd")
 const UiStyles := preload("res://src/game/ui/ui_styles.gd")
+const UiFocus := preload("res://src/game/ui/ui_focus.gd")
 
 var panel: PanelContainer
 var npc_name_label: Label
@@ -19,6 +20,8 @@ var desc_edit: LineEdit
 var weapons_check: CheckBox
 var danger_option: OptionButton
 var action_button: Button
+var cancel_button: Button
+var _focus_controls: Array[Control] = []
 var hold_hint: Label
 var status_label: Label
 
@@ -110,11 +113,14 @@ func _init() -> void:
 	action_button.pressed.connect(_on_action_pressed)
 	UiStyles.apply_button(action_button, 16)
 	buttons.add_child(action_button)
-	var cancel_btn := Button.new()
-	cancel_btn.text = Strings.lookup("ui.radio_cancel")
-	cancel_btn.pressed.connect(func(): cancelled.emit())
-	UiStyles.apply_button(cancel_btn, 16)
-	buttons.add_child(cancel_btn)
+	cancel_button = Button.new()
+	cancel_button.text = Strings.lookup("ui.radio_cancel")
+	cancel_button.pressed.connect(func(): cancelled.emit())
+	UiStyles.apply_button(cancel_button, 16)
+	buttons.add_child(cancel_button)
+	_focus_controls = [location_edit, desc_edit, weapons_check, danger_option,
+		action_button, cancel_button]
+	UiFocus.link(_focus_controls, false)
 
 var _title_label: Label
 
@@ -148,6 +154,8 @@ func open(controller: Object, emergency: bool, truth: Dictionary) -> void:
 	_holding = false
 	_hold_time = 0.0
 	visible = true
+	UiFocus.link(_focus_controls, false)
+	action_button.grab_focus()
 
 ## Non-emergency requests are a normal click. Emergency calls require the
 ## press-and-hold path, so the click release must not submit early.
@@ -200,3 +208,10 @@ func _danger_name(level: int) -> String:
 		2: return "elevated"
 		3: return "immediate threat"
 		_: return "unknown"
+
+func _unhandled_input(event: InputEvent) -> void:
+	if not visible:
+		return
+	if event.is_action_pressed("ui_cancel"):
+		cancelled.emit()
+		get_viewport().set_input_as_handled()