优化U3页面：在确认逻辑中增加对选定ID的存储

src/pages/U3/u3.tsx

@@ -28,6 +28,10 @@ const U3: React.FC = () => {
     getOptionalItemList(idCardNo)
       .then((res) => {
         if (res.Status === 200) {
+          localStorage.setItem(
+            "selectedExamId",
+            res.Data.packageInfo.physical_exam_id.toString() || ""
+          );
           if (
             res.Data?.packageInfo?.is_optional_package === 1 &&
             res.Data.packageInfo.registration_time.length > 0