feat: 删除确认框改为 MUI Dialog 风格，与系统 UI 一致

将批次数据、同步任务、连接配置三处删除操作的 window.confirm()
替换为统一的 MUI Dialog 确认弹窗，包含警告高亮区、详情信息展示
和"确认删除"/"取消"操作按钮。
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/pages/DataSyncPage.tsx

-import { useState, useEffect, useCallback } from 'react'
+import React, { useState, useEffect, useCallback } from 'react'
 import {
   Box, Typography, Card, CardContent, Stack, Chip, IconButton,
   Dialog, DialogTitle, DialogContent, DialogActions, Button,
@@ -22,6 +22,7 @@ import CloudDownloadIcon from '@mui/icons-material/CloudDownload'
 import RefreshIcon from '@mui/icons-material/Refresh'
 import ArrowForwardIcon from '@mui/icons-material/ArrowForward'
 import TableChartIcon from '@mui/icons-material/TableChart'
+import WarningAmberRoundedIcon from '@mui/icons-material/WarningAmberRounded'
 
 import { syncService, SyncSource, SyncSourceCreate, SyncBatch, TARGET_PATIENT_FIELDS, FieldMapping, PreviewResult } from '../services/syncService'
 import { connectionProfileService, ConnectionProfile, ConnectionProfileCreate } from '../services/connectionProfileService'
@@ -873,6 +874,13 @@ export function DataSyncPage() {
   const [batches, setBatches] = useState<SyncBatch[]>([])
   const [deletingBatch, setDeletingBatch] = useState<string | null>(null)
 
+  // 确认删除弹窗
+  const [confirmDialog, setConfirmDialog] = useState<{
+    title: string
+    body: React.ReactNode
+    onConfirm: () => void
+  } | null>(null)
+
   // 加载数据
   const loadData = useCallback(async () => {
     try {
@@ -916,42 +924,114 @@ export function DataSyncPage() {
   }
 
   // 按批次删除患者数据
-  const handleDeleteBatch = async (batch: SyncBatch) => {
-    if (!window.confirm(`确定删除批次「${batch.id.slice(0, 8)}...」的 ${batch.patient_count} 条患者数据吗？\n\n此操作不可撤销，与该批次相关的匹配记录不会被删除。`)) return
-    setDeletingBatch(batch.id)
-    try {
-      const result = await syncService.deleteBatch(batch.id)
-      showSnack('success', result.message)
-      loadData()
-    } catch (e: any) {
-      showSnack('error', e?.response?.data?.detail || '删除失败')
-    } finally {
-      setDeletingBatch(null)
-    }
+  const handleDeleteBatch = (batch: SyncBatch) => {
+    setConfirmDialog({
+      title: '删除批次数据',
+      body: (
+        <Stack spacing={2}>
+          <Box sx={{ display: 'flex', alignItems: 'flex-start', gap: 1.5, p: 1.5, bgcolor: 'error.50', borderRadius: 1, border: '1px solid', borderColor: 'error.200' }}>
+            <WarningAmberRoundedIcon color="error" sx={{ mt: 0.25, flexShrink: 0 }} />
+            <Box>
+              <Typography variant="body2" fontWeight={600} color="error.main" gutterBottom>
+                将删除 {batch.patient_count} 条患者数据，此操作不可撤销
+              </Typography>
+              <Typography variant="caption" color="text.secondary">
+                与该批次相关的 AI 匹配记录不会被删除。
+              </Typography>
+            </Box>
+          </Box>
+          <Box>
+            <Typography variant="caption" color="text.secondary">批次号</Typography>
+            <Typography variant="body2" sx={{ fontFamily: 'monospace', mt: 0.25 }}>{batch.id}</Typography>
+          </Box>
+          <Stack direction="row" spacing={3}>
+            <Box>
+              <Typography variant="caption" color="text.secondary">来源任务</Typography>
+              <Typography variant="body2">{batch.source_name}</Typography>
+            </Box>
+            <Box>
+              <Typography variant="caption" color="text.secondary">同步时间</Typography>
+              <Typography variant="body2">{formatDate(batch.created_at)}</Typography>
+            </Box>
+          </Stack>
+        </Stack>
+      ),
+      onConfirm: async () => {
+        setConfirmDialog(null)
+        setDeletingBatch(batch.id)
+        try {
+          const result = await syncService.deleteBatch(batch.id)
+          showSnack('success', result.message)
+          loadData()
+        } catch (e: any) {
+          showSnack('error', e?.response?.data?.detail || '删除失败')
+        } finally {
+          setDeletingBatch(null)
+        }
+      },
+    })
   }
 
   // 删除同步任务
-  const handleDeleteSource = async (source: SyncSource) => {
-    if (!window.confirm(`确定删除同步任务「${source.name}」吗？`)) return
-    try {
-      await syncService.deleteSource(source.id)
-      showSnack('success', '已删除')
-      loadData()
-    } catch (e: any) {
-      showSnack('error', '删除失败')
-    }
+  const handleDeleteSource = (source: SyncSource) => {
+    setConfirmDialog({
+      title: '删除同步任务',
+      body: (
+        <Stack spacing={2}>
+          <Box sx={{ display: 'flex', alignItems: 'flex-start', gap: 1.5, p: 1.5, bgcolor: 'error.50', borderRadius: 1, border: '1px solid', borderColor: 'error.200' }}>
+            <WarningAmberRoundedIcon color="error" sx={{ mt: 0.25, flexShrink: 0 }} />
+            <Typography variant="body2" color="error.main" fontWeight={600}>
+              删除后将无法恢复，历史同步批次记录不受影响
+            </Typography>
+          </Box>
+          <Box>
+            <Typography variant="caption" color="text.secondary">任务名称</Typography>
+            <Typography variant="body2" fontWeight={500}>{source.name}</Typography>
+          </Box>
+        </Stack>
+      ),
+      onConfirm: async () => {
+        setConfirmDialog(null)
+        try {
+          await syncService.deleteSource(source.id)
+          showSnack('success', '已删除')
+          loadData()
+        } catch (e: any) {
+          showSnack('error', '删除失败')
+        }
+      },
+    })
   }
 
   // 删除连接配置
-  const handleDeleteProfile = async (profile: ConnectionProfile) => {
-    if (!window.confirm(`确定删除连接配置「${profile.name}」吗？`)) return
-    try {
-      await connectionProfileService.delete(profile.id)
-      showSnack('success', '已删除')
-      loadData()
-    } catch (e: any) {
-      showSnack('error', '删除失败')
-    }
+  const handleDeleteProfile = (profile: ConnectionProfile) => {
+    setConfirmDialog({
+      title: '删除连接配置',
+      body: (
+        <Stack spacing={2}>
+          <Box sx={{ display: 'flex', alignItems: 'flex-start', gap: 1.5, p: 1.5, bgcolor: 'error.50', borderRadius: 1, border: '1px solid', borderColor: 'error.200' }}>
+            <WarningAmberRoundedIcon color="error" sx={{ mt: 0.25, flexShrink: 0 }} />
+            <Typography variant="body2" color="error.main" fontWeight={600}>
+              删除后将无法恢复，关联该配置的同步任务需重新绑定
+            </Typography>
+          </Box>
+          <Box>
+            <Typography variant="caption" color="text.secondary">配置名称</Typography>
+            <Typography variant="body2" fontWeight={500}>{profile.name}</Typography>
+          </Box>
+        </Stack>
+      ),
+      onConfirm: async () => {
+        setConfirmDialog(null)
+        try {
+          await connectionProfileService.delete(profile.id)
+          showSnack('success', '已删除')
+          loadData()
+        } catch (e: any) {
+          showSnack('error', '删除失败')
+        }
+      },
+    })
   }
 
   return (
@@ -1270,6 +1350,35 @@ export function DataSyncPage() {
         snack={{ snack, show: showSnack, hide: hideSnack }}
       />
 
+      {/* 确认删除弹窗 */}
+      <Dialog
+        open={!!confirmDialog}
+        onClose={() => setConfirmDialog(null)}
+        maxWidth="xs"
+        fullWidth
+      >
+        <DialogTitle sx={{ display: 'flex', alignItems: 'center', gap: 1, pb: 1 }}>
+          <DeleteIcon color="error" fontSize="small" />
+          <Typography variant="subtitle1" fontWeight={600}>{confirmDialog?.title}</Typography>
+        </DialogTitle>
+        <DialogContent sx={{ pt: 1 }}>
+          {confirmDialog?.body}
+        </DialogContent>
+        <DialogActions sx={{ px: 3, pb: 2, gap: 1 }}>
+          <Button onClick={() => setConfirmDialog(null)} variant="outlined" color="inherit">
+            取消
+          </Button>
+          <Button
+            variant="contained"
+            color="error"
+            startIcon={<DeleteIcon />}
+            onClick={() => confirmDialog?.onConfirm()}
+          >
+            确认删除
+          </Button>
+        </DialogActions>
+      </Dialog>
+
       {/* Snackbar */}
       <Snackbar open={snack.open} autoHideDuration={4000} onClose={hideSnack} anchorOrigin={{ vertical: 'top', horizontal: 'center' }}>
         <Alert onClose={hideSnack} severity={snack.severity} variant="filled">{snack.message}</Alert>