Fix cron-parser v5 bundling incompatibility causing validation failures (#2877)

* Initial plan

* Fix: Use default import for cron-parser to ensure browser compatibility

Changed from named export `{ CronExpressionParser }` to default export `cronParser` and access `CronExpressionParser` through it. This ensures compatibility with webpack/UmiJS bundling for browser environments while maintaining backend functionality.

Co-authored-by: whyour <22700758+whyour@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: whyour <22700758+whyour@users.noreply.github.com>

src/pages/crontab/modal.tsx

@@ -3,7 +3,7 @@ import config from '@/utils/config';
 import { request } from '@/utils/http';
 import { MinusCircleOutlined, PlusOutlined } from '@ant-design/icons';
 import { Button, Form, Input, Modal, Select, Space, message } from 'antd';
-import { CronExpressionParser } from 'cron-parser';
+import cronParser from 'cron-parser';
 import { useEffect, useState } from 'react';
 import intl from 'react-intl-universal';
 import { getScheduleType, scheduleTypeMap } from './const';
@@ -91,10 +91,14 @@ const CronModal = ({
             { required: true },
             {
               validator: (_, value) => {
-                if (!value || CronExpressionParser.parse(value).hasNext()) {
-                  return Promise.resolve();
+                try {
+                  if (!value || cronParser.CronExpressionParser.parse(value).hasNext()) {
+                    return Promise.resolve();
+                  }
+                  return Promise.reject(intl.get('Cron表达式格式有误'));
+                } catch (e) {
+                  return Promise.reject(intl.get('Cron表达式格式有误'));
                 }
-                return Promise.reject(intl.get('Cron表达式格式有误'));
               },
             },
           ]}