feat(audio): wire menu click feedback

Game/scripts/audio_manager.gd

@@ -9,6 +9,21 @@ const MAX_INTENSITY := 1.0
 var enabled := true
 
 
+func bind_tree_buttons(root: Node) -> void:
+	if root == null:
+		return
+	for node in root.find_children("*", "BaseButton", true, false):
+		bind_button(node as BaseButton)
+
+
+func bind_button(button: BaseButton) -> void:
+	if button == null:
+		return
+	var callback := Callable(self, "play_ui_click")
+	if not button.pressed.is_connected(callback):
+		button.pressed.connect(callback)
+
+
 func play_ui_click() -> void:
 	_play_tone(880.0, 0.045, 0.10)
 

Game/scripts/main_menu.gd

@@ -37,6 +37,7 @@ const DIFFICULTIES := [
 
 
 func _ready() -> void:
+	AudioManager.bind_tree_buttons(self)
 	# An idle menu has no reason to render past the display's own refresh
 	# rate; gameplay scenes are uncapped again by _leave_to_gameplay below.
 	var refresh_rate := DisplayServer.screen_get_refresh_rate()

Game/scripts/matchmaking.gd

@@ -21,6 +21,7 @@ var _recovery_poll_seconds := 0.0
 
 
 func _ready() -> void:
+	AudioManager.bind_tree_buttons(self)
 	playlist_dropdown.add_item("Casual")
 	playlist_dropdown.set_item_metadata(0, "casual")
 	playlist_dropdown.add_item("Ranked")

Game/scripts/settings_menu.gd

@@ -48,6 +48,7 @@ var _populating := false
 
 
 func _ready() -> void:
+	AudioManager.bind_tree_buttons(self)
 	# An idle settings screen has no reason to render past the display's own
 	# refresh rate; _on_back_pressed only returns to another capped menu, so
 	# no uncap is needed there (contrast main_menu.gd's _leave_to_gameplay).

Game/tests/cases/test_audio_manager.gd

@@ -15,3 +15,13 @@ func test_countdown_frequency_has_bounded_monotonic_mapping() -> void:
 	assert_eq(AudioManager.countdown_frequency(3), 605.0, "countdown tone is deterministic")
 	assert_eq(AudioManager.countdown_frequency(99), 935.0, "large countdown values are capped")
 	assert_true(AudioManager.countdown_frequency(2) < AudioManager.countdown_frequency(3), "countdown tones rise predictably")
+
+
+func test_button_binding_is_idempotent() -> void:
+	var manager := AudioManager.new()
+	var button := Button.new()
+	manager.bind_button(button)
+	manager.bind_button(button)
+	assert_eq(button.pressed.get_connections().size(), 1, "UI click hook is not duplicated")
+	button.free()
+	manager.free()