feat: 增强差旅报销审核流程与票据智能推理

优化本体解析和编排器的差旅场景处理能力，完善报销单草稿
保存和费用明细同步逻辑，前端报销创建页面增加行程推理和
票据审核交互，新增助手会话快照工具函数，补充单元测试。

web/src/components/business/PersonalWorkbench.vue

@@ -143,13 +143,17 @@
 </template>
 
 <script setup>
-import { computed, onMounted, ref, watch } from 'vue'
+import { computed, onBeforeUnmount, onMounted, ref, watch } from 'vue'
 import PanelHead from '../shared/PanelHead.vue'
 import WorkbenchListIcon from '../shared/WorkbenchListIcon.vue'
 import robotAssistant from '../../assets/robot-helper.png'
 import { useSystemState } from '../../composables/useSystemState.js'
 import { useToast } from '../../composables/useToast.js'
 import { clearUserConversations, fetchLatestConversation } from '../../services/orchestrator.js'
+import {
+  ASSISTANT_SESSION_SNAPSHOT_EVENT,
+  hasAssistantSessionSnapshot
+} from '../../utils/assistantSessionSnapshot.js'
 
 const props = defineProps({
   showHeader: { type: Boolean, default: true },
@@ -164,11 +168,15 @@ const fileInputRef = ref(null)
 const selectedFiles = ref([])
 const pendingAction = ref('')
 const latestExpenseConversation = ref(null)
+const hasLocalExpenseSnapshot = ref(false)
 const MAX_ATTACHMENTS = 10
 const SESSION_TYPE_EXPENSE = 'expense'
 const SESSION_TYPE_KNOWLEDGE = 'knowledge'
 
-const hasExpenseConversation = computed(() => Boolean(latestExpenseConversation.value?.conversation_id || latestExpenseConversation.value?.conversationId))
+const hasExpenseConversation = computed(() =>
+  Boolean(latestExpenseConversation.value?.conversation_id || latestExpenseConversation.value?.conversationId)
+    || hasLocalExpenseSnapshot.value
+)
 const expenseActionLabel = computed(() => (hasExpenseConversation.value ? '继续报销' : '新建报销'))
 const expenseActionIcon = computed(() => (hasExpenseConversation.value ? 'mdi mdi-history' : 'mdi mdi-magnify-scan'))
 const assistantGreetingName = computed(() => {
@@ -271,6 +279,7 @@ function handleWorkbenchFilesChange(event) {
 }
 
 async function refreshLatestExpenseConversation() {
+  refreshLocalExpenseSnapshot()
   try {
     latestExpenseConversation.value = await loadLatestConversation()
   } catch (error) {
@@ -279,6 +288,17 @@ async function refreshLatestExpenseConversation() {
   }
 }
 
+function refreshLocalExpenseSnapshot() {
+  hasLocalExpenseSnapshot.value = hasAssistantSessionSnapshot(resolveCurrentUserId(), SESSION_TYPE_EXPENSE)
+}
+
+function handleAssistantSessionSnapshotChange(event) {
+  const sessionType = String(event?.detail?.sessionType || '').trim()
+  if (!sessionType || sessionType === SESSION_TYPE_EXPENSE) {
+    refreshLocalExpenseSnapshot()
+  }
+}
+
 async function clearKnowledgeHistoryBeforeExpense() {
   await clearUserConversations(resolveCurrentUserId(), SESSION_TYPE_KNOWLEDGE)
 }
@@ -414,7 +434,13 @@ const policyItems = [
 ]
 
 onMounted(() => {
+  refreshLocalExpenseSnapshot()
   refreshLatestExpenseConversation()
+  window.addEventListener(ASSISTANT_SESSION_SNAPSHOT_EVENT, handleAssistantSessionSnapshotChange)
+})
+
+onBeforeUnmount(() => {
+  window.removeEventListener(ASSISTANT_SESSION_SNAPSHOT_EVENT, handleAssistantSessionSnapshotChange)
 })
 
 watch(