feat(web): AI 工作台文件预览/附件关联任务与草稿分支

- 新增 WorkbenchAiFilePreviewDialog 附件预览对话框及 useWorkbenchAiFilePreview，附件支持点击预览
- 新增 attachmentAssociationJobs/linkedReimbursementDraftJobs 前端服务与对应 composable，接入后台任务轮询与状态展示
- 新增 travelReimbursementDraftBranchModel 草稿分支模型，报销关联门控支持跳过/选择草稿
- PersonalWorkbenchAiMode 及各 composable（expense/document/steward/application-preview/attachment-association）重构适配，WorkbenchAiComposer/FileStrip 样式与交互完善
- DocumentsCenter/ReceiptFolder/TravelReimbursementCreate 等视图及 scripts 重构，风险/差旅规划/审批等工具适配
- 新增/更新前端测试：application-result-card、reimbursement-list-preview-fetch、guided-flow、composer-components 等

web/src/composables/useRequests.js

@@ -1,6 +1,10 @@
 import { computed, reactive, ref } from 'vue'
 
-import { fetchAllExpenseClaims } from '../services/reimbursements.js'
+import {
+  REIMBURSEMENT_LIST_PREVIEW_PARAMS,
+  extractExpenseClaimItems,
+  fetchExpenseClaims
+} from '../services/reimbursements.js'
 import { formatDate, toDate } from './requests/requestShared.js'
 import { mapExpenseClaimToRequest } from './requests/requestClaimMapper.js'
 
@@ -103,8 +107,8 @@ export function useRequests() {
     }
 
     try {
-      const payload = await fetchAllExpenseClaims()
-      requests.value = Array.isArray(payload) ? payload.map((item) => mapExpenseClaimToRequest(item)) : []
+      const payload = await fetchExpenseClaims(REIMBURSEMENT_LIST_PREVIEW_PARAMS)
+      requests.value = extractExpenseClaimItems(payload).map((item) => mapExpenseClaimToRequest(item))
       loaded.value = true
     } catch (nextError) {
       if (!silent) {