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/start_menu.gd

@@ -25,6 +25,8 @@ const VENUES := [
 
 var _index := 0
 var _buttons: Array[Button] = []
+var _footer_buttons: Array[Button] = []
+var _focus_targets: Array[Button] = []
 var _root: Control = null
 var _status: Label = null
 var _continue_button: Button = null
@@ -139,6 +141,7 @@ func _build() -> void:
 	help_button.pressed.connect(func(): help_requested.emit())
 	UiStyles.apply_button(help_button, 16)
 	row.add_child(help_button)
+	_footer_buttons.append(help_button)
 
 	var settings_button := Button.new()
 	settings_button.name = "SettingsButton"
@@ -146,6 +149,7 @@ func _build() -> void:
 	settings_button.pressed.connect(func(): settings_requested.emit())
 	UiStyles.apply_button(settings_button, 16)
 	row.add_child(settings_button)
+	_footer_buttons.append(settings_button)
 
 	var quit_button := Button.new()
 	quit_button.name = "QuitButton"
@@ -153,6 +157,7 @@ func _build() -> void:
 	quit_button.pressed.connect(func(): quit_requested.emit())
 	UiStyles.apply_button(quit_button, 16)
 	row.add_child(quit_button)
+	_footer_buttons.append(quit_button)
 
 	var hint := Label.new()
 	hint.text = Strings.lookup("ui.start_hint")
@@ -160,13 +165,28 @@ func _build() -> void:
 	hint.add_theme_color_override("font_color", Color(0.55, 0.58, 0.65))
 	column.add_child(hint)
 
+	_refresh_focus_targets()
 	_focus_index(0)
 
+## Continue + venue rows + footer actions, in visual order. Hidden Continue is
+## skipped so keyboard/gamepad focus never lands on an invisible control.
+func _refresh_focus_targets() -> void:
+	_focus_targets.clear()
+	if _continue_button and _continue_button.visible:
+		_focus_targets.append(_continue_button)
+	_focus_targets.append_array(_buttons)
+	_focus_targets.append_array(_footer_buttons)
+
 func _focus_index(i: int) -> void:
-	if _buttons.is_empty():
+	if _focus_targets.is_empty():
 		return
-	_index = clampi(i, 0, _buttons.size() - 1)
-	_buttons[_index].grab_focus()
+	_index = wrapi(i, 0, _focus_targets.size())
+	_focus_targets[_index].grab_focus()
+
+func _activate_focus() -> void:
+	if _focus_targets.is_empty():
+		return
+	_focus_targets[_index].pressed.emit()
 
 func open(campaign: Dictionary = {}) -> void:
 	_campaign = campaign.duplicate(true)
@@ -184,6 +204,7 @@ func open(campaign: Dictionary = {}) -> void:
 		var next_label := _venue_label(next_id)
 		_continue_button.text = Strings.fmt("ui.continue_shift", [next_label]) if next_id != "" else Strings.lookup("ui.campaign_complete_short")
 		_continue_button.visible = not complete
+	_refresh_focus_targets()
 	_focus_index(_index)
 
 func _venue_label(id: String) -> String:
@@ -203,20 +224,21 @@ func close() -> void:
 func _unhandled_input(event: InputEvent) -> void:
 	if not visible:
 		return
-	if event is InputEventKey and event.pressed and not event.echo:
-		match event.keycode:
-			KEY_UP, KEY_W:
-				_focus_index(_index - 1)
-				get_viewport().set_input_as_handled()
-			KEY_DOWN, KEY_S:
-				_focus_index(_index + 1)
-				get_viewport().set_input_as_handled()
-			KEY_ENTER, KEY_KP_ENTER, KEY_SPACE:
-				_on_venue_pressed(_index)
-				get_viewport().set_input_as_handled()
-			KEY_ESCAPE:
-				quit_requested.emit()
-				get_viewport().set_input_as_handled()
+	if event is InputEventKey and event.echo:
+		return
+	var key := event as InputEventKey
+	if event.is_action_pressed("ui_up") or (key != null and key.pressed and key.keycode == KEY_W):
+		_focus_index(_index - 1)
+		get_viewport().set_input_as_handled()
+	elif event.is_action_pressed("ui_down") or (key != null and key.pressed and key.keycode == KEY_S):
+		_focus_index(_index + 1)
+		get_viewport().set_input_as_handled()
+	elif event.is_action_pressed("ui_accept"):
+		_activate_focus()
+		get_viewport().set_input_as_handled()
+	elif event.is_action_pressed("ui_cancel"):
+		quit_requested.emit()
+		get_viewport().set_input_as_handled()
 
 func _on_venue_pressed(i: int) -> void:
 	if i < 0 or i >= VENUES.size():