Add get_current_room_name() helper to MainGame

Provides a convenient way to identify the current room at runtime by
extracting the room name from the scene script's resource path, rather
than relying on node names (which are always 'background').

MainGame.gd

@@ -10,6 +10,14 @@ var is_cursor_locked: bool = false  # When true, hourglass is shown and cursor c
 func get_scene() -> Scene:
 	return $SceneViewport/background
 
+func get_current_room_name() -> String:
+	var scene = get_scene()
+	if scene and scene.get_script():
+		var script_path = scene.get_script().resource_path
+		if script_path.begins_with("res://scenes/"):
+			return script_path.trim_suffix(".gd").get_file()
+	return ""
+
 # Called when the node enters the scene tree for the first time.
 func _ready():
 #	get_scene().connect("transitioned", Callable($SceneViewport/label, "_on_transitioned"))