feat(web): AI 工作台多 task 串行推进与会话适配

- useWorkbenchAiApplicationPreviewFlow/useWorkbenchAiActionRouter/useWorkbenchAiCommandIntents 支持 task1 完成后自动推进 task2，确认按钮直接拉起申请预览，草稿/提交成功后继续推进下一 task
- workbenchAiIntentPlannerModel/workbenchAiMessageModel/workbenchAiCommandIntentModel 适配多 task 意图规划与消息结构
- aiApplicationPreviewActions/aiApplicationPrecheckModel/aiExpenseDraftModel/aiWorkbenchConversationStore 草稿与会话存储适配
- PersonalWorkbenchAiMode 与样式适配，更新 preview-actions/expense-draft/conversation-store/fast-preview/action-router/command-intent/intent-planner 测试

web/tests/expense-application-fast-preview.test.mjs

@@ -362,6 +362,40 @@ test('travel application submit can continue with conversational planning recomm
   assert.match(recommendation, /AP-202606030001-ABCDE123/)
 })
 
+test('application edit preview only allows reason time location and transport changes', () => {
+  const preview = normalizeApplicationPreview({
+    sourceText: '修改申请',
+    applicationEditMode: true,
+    editableFields: ['reason', 'time', 'location', 'transportMode'],
+    fields: {
+      applicationType: '差旅费用申请',
+      applicant: '李文静',
+      grade: 'P5',
+      department: '财务部',
+      position: '财务分析师',
+      managerName: '王强',
+      time: '2026-05-25 至 2026-05-28',
+      location: '上海',
+      reason: '客户现场项目支持',
+      days: '4天',
+      transportMode: '火车',
+      lodgingDailyCap: '450元/天',
+      subsidyDailyCap: '100元/天',
+      transportPolicy: '按规则测算',
+      policyEstimate: '交通 300元 + 住宿 1800元 + 补贴 400元 = 2500元',
+      amount: '2500元'
+    }
+  })
+
+  const rows = buildApplicationPreviewRows(preview)
+  const editableKeys = rows.filter((row) => row.editable).map((row) => row.key)
+  assert.deepEqual(editableKeys, ['time', 'time_return', 'location', 'reason', 'transportMode'])
+  assert.equal(rows.find((row) => row.key === 'applicationType')?.editable, false)
+  assert.equal(rows.find((row) => row.key === 'days')?.editable, false)
+  assert.equal(rows.find((row) => row.key === 'amount')?.editable, false)
+  assert.match(buildLocalApplicationPreviewMessage(preview), /只修改事由、时间、地点和出行方式/)
+})
+
 test('application preview renders ordered editable rows and submit text uses edited values', () => {
   const preview = buildLocalApplicationPreview('申请 2026-05-25 至 2026-05-28 去新疆，伊犁出差，服务美团业务部署，火车，预计费用1800元', {
     name: '李文静',