feat: implement Stop N Go arena, animation system, and lobby manager features

scripts/managers/stop_n_go_manager.gd

@@ -145,6 +145,13 @@ func _update_hud_visuals():
 				var player_node = main.get_node_or_null(str(my_id))
 				if player_node:
 					NotificationManager.send_message(player_node, "ALL GOALS COMPLETE!", NotificationManager.MessageType.GOAL)
+					
+					# Play looping "GoFinish" animation to signals the Go phase for this player
+					if main and main.get("vfx_manager"):
+						if main.vfx_manager.has_method("play_go_finish_animation"):
+							main.vfx_manager.play_go_finish_animation()
+						elif main.vfx_manager.has_method("play_go_animation"):
+							main.vfx_manager.play_go_animation()
 		else:
 			mission_label.add_theme_color_override("font_color", Color.WHITE)
 			_has_notified_mission_complete = false