feat: implement settings menu, audio management system, and lobby UI framework

scenes/main.gd

@@ -45,6 +45,9 @@ func _ready():
 	# Setup visual elevations for effects
 	_setup_effect_elevation()
 	
+	# Start background music for the game mode
+	MusicManager.start_music()
+	
 	# Setup UI
 	ui_manager.setup_playerboard_ui()
 	ui_manager.setup_timer_labels(self )
@@ -188,7 +191,6 @@ func _setup_effect_elevation():
 		em.mesh_library = ml
 		print("[Main] MeshLibrary elevation applied: Wall(4) and Freeze(5) at Y=0.8")
 
-
 @rpc("any_peer", "call_local", "reliable")
 func sync_portal_configs(configs: Array):
 	if portal_mode_manager: