iter44-卡1：卡①(组合根注册面批): ui_registry+三域容器建件·main.gd 49→15·全消费面改址main.ui.*·四闸主证行为零变化

game/probe/probe_ui_util.gd

@@ -130,7 +130,7 @@ static func open_camp_via_savesel(main, tag: String) -> bool:
 			if FileAccess.file_exists(sp):
 				DirAccess.remove_absolute(sp)
 	main._open_save_select()
-	var new_btn: Button = main.save_select_overlay._new_btns.get(1)
+	var new_btn: Button = main.ui.modals.save_select_overlay._new_btns.get(1)
 	if new_btn == null:
 		return false
 	new_btn.pressed.emit()   # 真实按钮信号路径 → _on_save_select_new → create_slot+open_camp