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/workbenchAiMode/useWorkbenchAiActionRouter.js

@@ -13,6 +13,9 @@ import {
 } from './workbenchAiMessageModel.js'
 import { SESSION_TYPE_EXPENSE } from './useWorkbenchAiExpenseFlow.js'
 import {
+  CANCEL_STANDALONE_REIMBURSEMENT_DRAFT_ACTION,
+  CONTINUE_REIMBURSEMENT_DRAFT_ACTION,
+  CREATE_STANDALONE_REIMBURSEMENT_DRAFT_ACTION,
   SKIP_REQUIRED_APPLICATION_LINK_ACTION,
   SKIP_REIMBURSEMENT_DRAFT_CHECK_ACTION
 } from '../../views/scripts/travelReimbursementAssociationGateModel.js'
@@ -102,6 +105,25 @@ export function useWorkbenchAiActionRouter({
       return
     }
 
+    if (actionType === CONTINUE_REIMBURSEMENT_DRAFT_ACTION) {
+      expenseFlow.promptAiReimbursementDraftContinuation(actionPayload)
+      focusAiModeInput()
+      return
+    }
+
+    if (actionType === CREATE_STANDALONE_REIMBURSEMENT_DRAFT_ACTION) {
+      expenseFlow.promptStandaloneReimbursementDraftCreation(
+        actionPayload.original_message || '我要报销',
+        action.label || '独立新建报销单'
+      )
+      return
+    }
+
+    if (actionType === CANCEL_STANDALONE_REIMBURSEMENT_DRAFT_ACTION) {
+      expenseFlow.cancelStandaloneReimbursementDraftCreation()
+      return
+    }
+
     if (actionType === SKIP_REIMBURSEMENT_DRAFT_CHECK_ACTION) {
       void expenseFlow.startAiReimbursementAssociationGate(
         actionPayload.original_message || '我要报销',