fix: 活动管理，费用明细逻辑修改。

src/views/health/activity/index.vue

@@ -448,19 +448,46 @@ function confirmSummary() {
     const totalAmount = parseFloat(calculateTotalAmount())
     const currentTotal = parseFloat(activity.totalCost) || 0
 
+    // 判断活动是否跨天
+    const startDate = activity.startTime ? dayjs(activity.startTime).format('YYYY-MM-DD') : ''
+    const endDate = activity.endTime ? dayjs(activity.endTime).format('YYYY-MM-DD') : ''
+    const isMultiDay = startDate !== endDate
+
     // 构建费用明细
-    const details = selectedExpenses.value
-      .map((item) => {
+    let detailsWithDate = ''
+
+    if (isMultiDay) {
+      // 多天活动：按日期分组
+      const groupedByDate = {}
+      selectedExpenses.value.forEach((item) => {
+        const date = dayjs(item.createTime).format('MM-DD')
+        if (!groupedByDate[date]) {
+          groupedByDate[date] = []
+        }
         const category = item.childCategoryName || ''
-        return `${category} ${item.amount}元${item.remark ? '(' + item.remark + ')' : ''}`
+        groupedByDate[date].push(`${category} ${item.amount}元${item.remark ? '(' + item.remark + ')' : ''}`)
       })
-      .join('；')
+
+      // 按日期组装明细
+      detailsWithDate = Object.keys(groupedByDate)
+        .sort()
+        .map((date) => `${date} ${groupedByDate[date].join('、')}`)
+        .join('；')
+    } else {
+      // 单天活动：不带日期
+      detailsWithDate = selectedExpenses.value
+        .map((item) => {
+          const category = item.childCategoryName || ''
+          return `${category} ${item.amount}元${item.remark ? '(' + item.remark + ')' : ''}`
+        })
+        .join('；')
+    }
 
     // 更新活动费用
     const updateData = {
       ...activity,
       totalCost: (currentTotal + totalAmount).toFixed(2),
-      costDetail: activity.costDetail ? `${activity.costDetail}；${details}` : details
+      costDetail: activity.costDetail ? `${activity.costDetail}；${detailsWithDate}` : detailsWithDate
     }
 
     updateActivity(updateData).then(() => {