refactor: Images.vue uses shared composables, fix error handling

- Import statusType/statusText/fmtTime from useFileUtils composable
- Use useFilePreview composable for preview state and logic
- Remove duplicated preview refs, cleanupPreview, and utility functions
- Add try/finally to loadData for reliable loading state
- Properly handle cancel vs error in deleteFile and batchDelete

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

web/frontend/src/views/files/Images.vue

@@ -121,9 +121,12 @@ import { ref, onMounted } from 'vue'
 import { ElMessage, ElMessageBox } from 'element-plus'
 import { Right } from '@element-plus/icons-vue'
 import { useProcessingStore } from '../../stores/processing'
+import { statusType, statusText, fmtTime } from '../../composables/useFileUtils'
+import { useFilePreview } from '../../composables/useFilePreview'
 import api from '../../api'
 
 const processingStore = useProcessingStore()
+const { showPreview, previewType, previewSrc, previewRows, openPreview, cleanupPreview } = useFilePreview()
 
 const items = ref<any[]>([])
 const total = ref(0)
@@ -135,65 +138,28 @@ const sortBy = ref('created_at')
 const sortOrder = ref('desc')
 const uploadInput = ref<HTMLInputElement>()
 
-const showPreview = ref(false)
-const previewType = ref('')
-const previewSrc = ref('')
-const previewRows = ref<string[][]>([])
 const showDetailDlg = ref(false)
 const detailLogs = ref<string[]>([])
 
-function statusType(s: string) {
-  const m: Record<string, string> = { done: 'success', merged: 'success', excel_done: 'warning', ocr_done: 'info', pending: 'info' }
-  return m[s] || 'info'
-}
-function statusText(s: string) {
-  const m: Record<string, string> = { done: '已完成', merged: '已合并', excel_done: '已处理', ocr_done: '已OCR', pending: '待处理' }
-  return m[s] || s
-}
-
-function fmtTime(t: string): string {
-  if (!t) return '--'
-  return t.replace('T', ' ').slice(0, 19)
-}
-
 async function loadData() {
   loading.value = true
   try {
     const res = await api.get('/files/relations', { params: { view: 'images', page: page.value, page_size: pageSize, sort_by: sortBy.value, sort_order: sortOrder.value } })
     items.value = res.data.items
     total.value = res.data.total
-  } catch {}
-  loading.value = false
+  } catch {
+    ElMessage.error('加载文件列表失败')
+  } finally {
+    loading.value = false
+  }
 }
 
 function onSelect(rows: any[]) { selected.value = rows }
 
 async function previewFile(row: any) {
-  const token = localStorage.getItem('token')
   const fname = row.input_image || row.output_excel || row.result_purchase
   const dir = row.input_image ? 'input' : row.output_excel ? 'output' : 'result'
-  try {
-    const resp = await fetch(`/api/files/preview/${dir}/${encodeURIComponent(fname)}`, { headers: { Authorization: `Bearer ${token}` } })
-    const ct = resp.headers.get('content-type') || ''
-    if (ct.includes('image')) {
-      previewType.value = 'image'
-      const blob = await resp.blob()
-      previewSrc.value = URL.createObjectURL(blob)
-    } else {
-      const data = await resp.json()
-      if (data.type === 'excel') { previewType.value = 'excel'; previewRows.value = data.rows }
-    }
-    showPreview.value = true
-  } catch { ElMessage.error('预览失败') }
-}
-
-function cleanupPreview() {
-  if (previewSrc.value && previewSrc.value.startsWith('blob:')) {
-    URL.revokeObjectURL(previewSrc.value)
-  }
-  previewSrc.value = ''
-  previewType.value = ''
-  previewRows.value = []
+  await openPreview(dir, fname)
 }
 
 function showDetail(row: any) {
@@ -269,7 +235,9 @@ async function deleteFile(row: any) {
     if (row.id) await api.delete('/files/relations', { data: { ids: [row.id] } })
     ElMessage.success('已删除')
     loadData()
-  } catch {}
+  } catch (err: any) {
+    if (err !== 'cancel') ElMessage.error('删除失败')
+  }
 }
 
 async function batchPipeline() {
@@ -314,7 +282,9 @@ async function batchDelete() {
     }
     ElMessage.success('批量删除完成')
     loadData()
-  } catch {}
+  } catch (err: any) {
+    if (err !== 'cancel') ElMessage.error('批量删除失败')
+  }
 }
 
 onMounted(loadData)