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/tests/travel-reimbursement-guided-flow.test.mjs

@@ -94,6 +94,10 @@ const submitComposerScript = readFileSync(
   fileURLToPath(new URL('../src/views/scripts/useTravelReimbursementSubmitComposer.js', import.meta.url)),
   'utf8'
 )
+const submitDraftPreflightScript = readFileSync(
+  fileURLToPath(new URL('../src/views/scripts/travelReimbursementSubmitDraftPreflight.js', import.meta.url)),
+  'utf8'
+)
 const messageHandlersScript = readFileSync(
   fileURLToPath(new URL('../src/views/scripts/useTravelReimbursementCreateViewMessageHandlers.js', import.meta.url)),
   'utf8'
@@ -477,6 +481,12 @@ test('guided flow is local until final confirmation or collected query handoff',
   assert.doesNotMatch(guidedFlowScript, /startExpenseClaimDraftFlowStep/)
   assert.match(guidedModelScript, /review_action:\s*['"]save_draft['"]/)
   assert.match(guidedFlowScript, /fetchExpenseClaims/)
+  assert.match(guidedFlowScript, /REIMBURSEMENT_LIST_PREVIEW_PARAMS/)
+  assert.match(guidedFlowScript, /fetchExpenseClaims\(REIMBURSEMENT_LIST_PREVIEW_PARAMS\)/)
+  assert.match(submitDraftPreflightScript, /REIMBURSEMENT_LIST_PREVIEW_PARAMS/)
+  assert.match(submitDraftPreflightScript, /fetchExpenseClaims\(REIMBURSEMENT_LIST_PREVIEW_PARAMS\)/)
+  assert.doesNotMatch(guidedFlowScript, /fetchExpenseClaims\(\)/)
+  assert.doesNotMatch(submitDraftPreflightScript, /fetchExpenseClaims\(\)/)
   assert.match(guidedFlowScript, /GUIDED_ACTION_SELECT_REQUIRED_APPLICATION/)
   assert.match(guidedFlowScript, /isGuidedReimbursementReadyForReview\(guidedFlowState\.value\)[\s\S]*pushReimbursementSummary\(\)/)
   assert.match(guidedFlowScript, /isGuidedReimbursementReadyForReview\(currentState\) && fileNames\.length[\s\S]*buildGuidedReviewSubmitOptions\(currentState, mergedFiles\)[\s\S]*skipDraftAssociationPrompt:\s*true[\s\S]*skipUserMessage:\s*true[\s\S]*submitExistingComposer\(submitOptions\)/)