fix: 退款审批可以是0

src/views/finance/refund/detail.vue

@@ -42,7 +42,7 @@
           <span>{{ refund?.refund_no }}</span>
         </ElFormItem>
         <ElFormItem label="申请退款金额">
-          <span>{{ formatCurrency(refund?.requested_refund_amount || 0) }}</span>
+          <span>{{ formatCurrency(refund?.requested_refund_amount) }}</span>
         </ElFormItem>
         <ElFormItem label="实际退款金额" prop="approved_refund_amount">
           <ElInputNumber
@@ -236,7 +236,9 @@
     refund_reason: ''
   })
 
-  const formatCurrency = (amount: number): string => {
+  const formatCurrency = (amount: number | null | undefined): string => {
+    if (amount === undefined || amount === null || Number.isNaN(amount)) return '-'
+
     return `¥${(amount / 100).toFixed(2)}`
   }
 
@@ -293,8 +295,7 @@
         },
         {
           label: '实际退款金额',
-          formatter: (_, data) =>
-            data.approved_refund_amount ? formatCurrency(data.approved_refund_amount) : '-'
+          formatter: (_, data) => formatCurrency(data.approved_refund_amount)
         },
         {
           label: '实收金额',