feat: 完善文档中心与报销申请交互及侧边栏重构

后端优化编排器报销查询和本体检测精度，增强报销单草稿保
存和附件回填逻辑，前端重构侧边栏组件支持折叠和图标导
航，完善文档中心状态筛选和详情提示，报销创建和审批详情
页优化会话管理和费用明细交互，新增助手应用服务和预设动
作工具函数，补充单元测试覆盖。

web/src/views/scripts/useTravelReimbursementSessionState.js

@@ -1,6 +1,6 @@
 import { nextTick, ref } from 'vue'
 
-import { clearUserConversations, fetchLatestConversation } from '../../services/orchestrator.js'
+import { fetchLatestConversation } from '../../services/orchestrator.js'
 import {
   clearAssistantSessionSnapshot,
   readAssistantSessionSnapshot,
@@ -11,8 +11,9 @@ import {
   filterPersistableFilePreviews
 } from './travelReimbursementAttachmentModel.js'
 import {
+  ASSISTANT_SESSION_TYPES,
+  SESSION_TYPE_APPLICATION,
   SESSION_TYPE_EXPENSE,
-  SESSION_TYPE_KNOWLEDGE,
   buildInitialInsightFromConversation,
   buildWelcomeInsight,
   buildWelcomeQuickActions,
@@ -20,6 +21,7 @@ import {
   hasMeaningfulSessionMessages,
   normalizeInitialConversationMessages,
   normalizeSnapshotMessages,
+  normalizeAssistantSessionType,
   resolveInitialConversationId,
   resolveInitialDraftClaimId,
   resolveInitialSessionType,
@@ -41,6 +43,10 @@ export function useTravelReimbursementSessionState({
   scrollToBottom,
   getSessionRuntimeRefs = () => ({})
 }) {
+  function resolveDefaultSessionTypeFromEntry() {
+    return props.entrySource === 'application' ? SESSION_TYPE_APPLICATION : SESSION_TYPE_EXPENSE
+  }
+
   function refreshWelcomeQuickActions(messages, sessionType) {
     if (!Array.isArray(messages) || !messages.length) {
       return []
@@ -58,8 +64,8 @@ export function useTravelReimbursementSessionState({
     ))
   }
 
-  function buildConversationSessionState(conversation, fallbackSessionType = SESSION_TYPE_EXPENSE) {
-    const sessionType = resolveInitialSessionType(conversation) || fallbackSessionType
+  function buildConversationSessionState(conversation, fallbackSessionType = resolveDefaultSessionTypeFromEntry()) {
+    const sessionType = resolveInitialSessionType(conversation, fallbackSessionType)
     const restoredMessages = refreshWelcomeQuickActions(normalizeInitialConversationMessages(conversation), sessionType)
     const initialInsight = buildInitialInsightFromConversation(conversation)
     const restoredReviewFilePreviews = buildReviewFilePreviewsFromMessages(restoredMessages)
@@ -84,17 +90,18 @@ export function useTravelReimbursementSessionState({
   }
 
   function buildEmptySessionState(sessionType) {
+    const normalizedSessionType = normalizeAssistantSessionType(sessionType, resolveDefaultSessionTypeFromEntry())
     return {
-      sessionType,
+      sessionType: normalizedSessionType,
       messages: [
-        createWelcomeAssistantMessage(props.entrySource, linkedRequest.value, sessionType, currentUser.value)
+        createWelcomeAssistantMessage(props.entrySource, linkedRequest.value, normalizedSessionType, currentUser.value)
       ],
       conversationId: '',
       draftClaimId: '',
       currentInsight: buildWelcomeInsight(
         props.entrySource,
         linkedRequest.value,
-        sessionType,
+        normalizedSessionType,
         currentUser.value
       ),
       reviewFilePreviews: [],
@@ -107,13 +114,16 @@ export function useTravelReimbursementSessionState({
     }
   }
 
-  function buildPersistedSessionState(snapshot, fallbackSessionType = SESSION_TYPE_EXPENSE) {
+  function buildPersistedSessionState(snapshot, fallbackSessionType = resolveDefaultSessionTypeFromEntry()) {
     const state = snapshot?.state && typeof snapshot.state === 'object' ? snapshot.state : null
     if (!state) {
       return null
     }
 
-    const sessionType = String(state.sessionType || snapshot.sessionType || fallbackSessionType || '').trim() || SESSION_TYPE_EXPENSE
+    const sessionType = normalizeAssistantSessionType(
+      state.sessionType || snapshot.sessionType || fallbackSessionType,
+      fallbackSessionType
+    )
     const restoredMessages = refreshWelcomeQuickActions(normalizeSnapshotMessages(state.messages), sessionType)
     if (
       !hasMeaningfulSessionMessages(restoredMessages)
@@ -148,13 +158,16 @@ export function useTravelReimbursementSessionState({
     return String(user.username || user.name || 'anonymous').trim() || 'anonymous'
   }
 
-  const initialSessionType = resolveInitialSessionType(props.initialConversation)
+  const defaultInitialSessionType = resolveDefaultSessionTypeFromEntry()
+  const initialSessionType = props.initialConversation
+    ? resolveInitialSessionType(props.initialConversation, defaultInitialSessionType)
+    : defaultInitialSessionType
   const shouldPersistLocalSnapshot = props.entrySource !== 'detail'
   const conversationInitialState = props.initialConversation
     ? buildConversationSessionState(props.initialConversation, initialSessionType)
     : buildEmptySessionState(initialSessionType)
   const canRestorePersistedInitialState =
-    props.entrySource === 'workbench'
+    shouldPersistLocalSnapshot
       && !String(props.initialPrompt || '').trim()
       && !props.initialFiles.length
   const persistedInitialSnapshot = readAssistantSessionSnapshot(resolveCurrentUserId(), initialSessionType)
@@ -174,21 +187,22 @@ export function useTravelReimbursementSessionState({
   const conversationId = ref(initialSessionState.conversationId)
   const draftClaimId = ref(initialSessionState.draftClaimId)
   const reviewFilePreviews = ref(initialSessionState.reviewFilePreviews)
-  const sessionSnapshots = ref({
-    [SESSION_TYPE_EXPENSE]: null,
-    [SESSION_TYPE_KNOWLEDGE]: null
-  })
+  const sessionSnapshots = ref(
+    ASSISTANT_SESSION_TYPES.reduce((result, sessionType) => {
+      result[sessionType] = null
+      return result
+    }, {})
+  )
   const currentInsight = ref(initialSessionState.currentInsight)
   const composerUploadIntent = ref(String(initialSessionState.composerUploadIntent || '').trim())
   const guidedFlowState = ref(normalizeGuidedFlowState(initialSessionState.guidedFlowState))
   const insightPanelCollapsed = ref(false)
   const sessionSwitchBusy = ref(false)
-  let knowledgeSessionResetPromise = Promise.resolve()
 
   function buildPersistableSessionState(sessionState) {
     const state = sessionState || captureCurrentSessionState()
     return {
-      sessionType: state.sessionType || SESSION_TYPE_EXPENSE,
+      sessionType: normalizeAssistantSessionType(state.sessionType, resolveDefaultSessionTypeFromEntry()),
       messages: serializeSessionMessages(state.messages),
       conversationId: String(state.conversationId || '').trim(),
       draftClaimId: String(state.draftClaimId || '').trim(),
@@ -244,7 +258,7 @@ export function useTravelReimbursementSessionState({
   function applySessionState(sessionState) {
     const runtimeRefs = getSessionRuntimeRefs()
     const nextState = sessionState || buildEmptySessionState(activeSessionType.value)
-    activeSessionType.value = nextState.sessionType || SESSION_TYPE_EXPENSE
+    activeSessionType.value = normalizeAssistantSessionType(nextState.sessionType, resolveDefaultSessionTypeFromEntry())
     messages.value = Array.isArray(nextState.messages) && nextState.messages.length
       ? nextState.messages
       : [
@@ -287,38 +301,18 @@ export function useTravelReimbursementSessionState({
   }
 
   async function loadLatestSessionState(targetSessionType) {
-    const payload = await fetchLatestConversation(resolveCurrentUserId(), targetSessionType, {
-      preferRecoverable: targetSessionType === SESSION_TYPE_EXPENSE
+    const normalizedTarget = normalizeAssistantSessionType(targetSessionType, resolveDefaultSessionTypeFromEntry())
+    const payload = await fetchLatestConversation(resolveCurrentUserId(), normalizedTarget, {
+      preferRecoverable: normalizedTarget === SESSION_TYPE_EXPENSE
     })
     if (payload?.found && payload.conversation) {
-      return buildConversationSessionState(payload.conversation, targetSessionType)
+      return buildConversationSessionState(payload.conversation, normalizedTarget)
     }
-    return buildEmptySessionState(targetSessionType)
-  }
-
-  function resetKnowledgeSessionSnapshot() {
-    const emptyKnowledgeState = buildEmptySessionState(SESSION_TYPE_KNOWLEDGE)
-    sessionSnapshots.value[SESSION_TYPE_KNOWLEDGE] = emptyKnowledgeState
-
-    if (activeSessionType.value === SESSION_TYPE_KNOWLEDGE) {
-      applySessionState(emptyKnowledgeState)
-    }
-  }
-
-  function clearKnowledgeSessionOnEntry() {
-    resetKnowledgeSessionSnapshot()
-    knowledgeSessionResetPromise = clearUserConversations(resolveCurrentUserId(), SESSION_TYPE_KNOWLEDGE)
-      .catch((error) => {
-        console.warn('Failed to clear knowledge session on entry:', error)
-      })
-      .finally(() => {
-        resetKnowledgeSessionSnapshot()
-      })
-    return knowledgeSessionResetPromise
+    return buildEmptySessionState(normalizedTarget)
   }
 
   async function switchSessionType(targetSessionType) {
-    const normalizedTarget = String(targetSessionType || '').trim() || SESSION_TYPE_EXPENSE
+    const normalizedTarget = normalizeAssistantSessionType(targetSessionType, resolveDefaultSessionTypeFromEntry())
     if (normalizedTarget === activeSessionType.value || sessionSwitchBusy.value) {
       return
     }
@@ -338,7 +332,7 @@ export function useTravelReimbursementSessionState({
       const emptyState = buildEmptySessionState(normalizedTarget)
       sessionSnapshots.value[normalizedTarget] = emptyState
       applySessionState(emptyState)
-      toast(error?.message || '?????????????????')
+      toast(error?.message || '切换助手失败，请稍后重试。')
     } finally {
       sessionSwitchBusy.value = false
     }
@@ -368,8 +362,6 @@ export function useTravelReimbursementSessionState({
     captureCurrentSessionState,
     applySessionState,
     loadLatestSessionState,
-    resetKnowledgeSessionSnapshot,
-    clearKnowledgeSessionOnEntry,
     switchSessionType
   }
 }