feat(nav): add GameState.set_current_room and AudioManager.DEFAULT_MUSIC_VOLUME

scripts/autoload/AudioManager.gd

@@ -3,6 +3,7 @@
 extends Node
 
 const CROSSFADE_DURATION: float = 0.8
+const DEFAULT_MUSIC_VOLUME: float = 0.6
 
 const _MUSIC_MAP: Dictionary = {
 	0: "res://assets/audio/music/floor_0.ogg",

scripts/autoload/GameState.gd

@@ -73,6 +73,11 @@ func clear_chest_state(chest_id: String) -> void:
 	state_changed.emit()
 
 
+func set_current_room(room: String) -> void:
+	current_room = room
+	state_changed.emit()
+
+
 func get_save_data() -> Dictionary:
 	var positions: Dictionary = {}
 	for key: String in _character_positions: