fix: 替换支付失败提示为模态框并防止重复显示

将支付失败时的toast提示改为模态框提示，并添加防止模态框重复显示的标志位

 <!--
  * @Date: 2024-01-15 16:25:51
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2026-01-16 18:01:23
+ * @LastEditTime: 2026-01-16 18:05:18
  * @FilePath: /xyxBooking-weapp/src/pages/submit/index.vue
  * @Description: 预约人员信息
 -->
@@ -149,6 +149,22 @@ const refreshVisitorList = async (options) => {
   }
 }
 
+let is_showing_pay_modal = false;
+const showPayErrorModal = async (content) => {
+  if (is_showing_pay_modal) return;
+  is_showing_pay_modal = true;
+  try {
+    await Taro.showModal({
+      title: '提示',
+      content: content || '支付失败，请稍后再试',
+      showCancel: false,
+      confirmText: '我知道了',
+    });
+  } finally {
+    is_showing_pay_modal = false;
+  }
+}
+
 const submitBtn = async () => {
   if (is_submitting.value) return;
   if (!checked_visitors.value.length) {
@@ -211,12 +227,12 @@ const submitBtn = async () => {
           },
           fail(res) {
             refreshVisitorList({ reset_checked: true }).catch(() => {});
-            Taro.showToast({ title: '支付未完成，可再次点击提交订单继续支付', icon: 'none' });
+            showPayErrorModal('支付未完成，可再次点击提交订单继续支付').catch(() => {});
           }
         })
       } else {
         refreshVisitorList({ reset_checked: true }).catch(() => {});
-        Taro.showToast({ title: payParams?.msg || '获取支付信息失败', icon: 'none' });
+        showPayErrorModal(payParams?.msg || '获取支付信息失败，请稍后再试').catch(() => {});
       }
     } else {
       pending_pay_id.value = null;