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/useAppShell.js

@@ -5,7 +5,12 @@ import { useNavigation, navItems } from './useNavigation.js'
 import { mapExpenseClaimToRequest, useRequests } from './useRequests.js'
 import { useSystemState } from './useSystemState.js'
 import { useToast } from './useToast.js'
-import { fetchAllApprovalExpenseClaims, fetchExpenseClaimDetail } from '../services/reimbursements.js'
+import {
+  REIMBURSEMENT_LIST_PREVIEW_PARAMS,
+  extractExpenseClaimItems,
+  fetchApprovalExpenseClaims,
+  fetchExpenseClaimDetail
+} from '../services/reimbursements.js'
 import { fetchOntologyParse } from '../services/ontology.js'
 import { fetchLatestConversation } from '../services/orchestrator.js'
 import { markAiWorkbenchConversationDraftDeleted } from '../utils/aiWorkbenchConversationStore.js'
@@ -125,10 +130,8 @@ export function useAppShell() {
 
   async function reloadWorkbenchApprovalRequests() {
     try {
-      const payload = await fetchAllApprovalExpenseClaims()
-      workbenchApprovalRequests.value = Array.isArray(payload)
-        ? payload.map((item) => mapExpenseClaimToRequest(item))
-        : []
+      const payload = await fetchApprovalExpenseClaims(REIMBURSEMENT_LIST_PREVIEW_PARAMS)
+      workbenchApprovalRequests.value = extractExpenseClaimItems(payload).map((item) => mapExpenseClaimToRequest(item))
     } catch {
       workbenchApprovalRequests.value = []
     }