fix: 优化报销创建页面样式与洞察面板交互

修复侧边栏和审计视图样式细节，完善差旅报销洞察面板和消息
组件布局，优化报销创建页面会话管理和流程状态持久化，增强
申请预览工具函数和导航图标，补充单元测试。

web/src/views/scripts/useTravelReimbursementSessionState.js

@@ -12,6 +12,7 @@ import {
 } from './travelReimbursementAttachmentModel.js'
 import {
   ASSISTANT_SESSION_TYPES,
+  filterAssistantSessionTypes,
   SESSION_TYPE_APPLICATION,
   SESSION_TYPE_EXPENSE,
   buildInitialInsightFromConversation,
@@ -43,6 +44,25 @@ export function useTravelReimbursementSessionState({
   scrollToBottom,
   getSessionRuntimeRefs = () => ({})
 }) {
+  function resolveAccessibleSessionTypes() {
+    return filterAssistantSessionTypes(ASSISTANT_SESSION_TYPES, currentUser.value)
+  }
+
+  function resolveAccessibleSessionType(rawSessionType, fallback = resolveDefaultSessionTypeFromEntry()) {
+    const normalized = normalizeAssistantSessionType(rawSessionType, fallback)
+    const accessible = resolveAccessibleSessionTypes()
+    if (accessible.includes(normalized)) {
+      return normalized
+    }
+
+    const fallbackNormalized = String(fallback || '').trim()
+    if (accessible.includes(fallbackNormalized)) {
+      return fallbackNormalized
+    }
+
+    return accessible[0] || SESSION_TYPE_APPLICATION
+  }
+
   function resolveDefaultSessionTypeFromEntry() {
     return props.entrySource === 'application' ? SESSION_TYPE_APPLICATION : SESSION_TYPE_EXPENSE
   }
@@ -65,7 +85,10 @@ export function useTravelReimbursementSessionState({
   }
 
   function buildConversationSessionState(conversation, fallbackSessionType = resolveDefaultSessionTypeFromEntry()) {
-    const sessionType = resolveInitialSessionType(conversation, fallbackSessionType)
+    const sessionType = resolveAccessibleSessionType(
+      resolveInitialSessionType(conversation, fallbackSessionType),
+      fallbackSessionType
+    )
     const restoredMessages = refreshWelcomeQuickActions(normalizeInitialConversationMessages(conversation), sessionType)
     const initialInsight = buildInitialInsightFromConversation(conversation)
     const restoredReviewFilePreviews = buildReviewFilePreviewsFromMessages(restoredMessages)
@@ -90,7 +113,10 @@ export function useTravelReimbursementSessionState({
   }
 
   function buildEmptySessionState(sessionType) {
-    const normalizedSessionType = normalizeAssistantSessionType(sessionType, resolveDefaultSessionTypeFromEntry())
+    const normalizedSessionType = resolveAccessibleSessionType(
+      sessionType,
+      resolveDefaultSessionTypeFromEntry()
+    )
     return {
       sessionType: normalizedSessionType,
       messages: [
@@ -120,7 +146,7 @@ export function useTravelReimbursementSessionState({
       return null
     }
 
-    const sessionType = normalizeAssistantSessionType(
+    const sessionType = resolveAccessibleSessionType(
       state.sessionType || snapshot.sessionType || fallbackSessionType,
       fallbackSessionType
     )
@@ -159,9 +185,12 @@ export function useTravelReimbursementSessionState({
   }
 
   const defaultInitialSessionType = resolveDefaultSessionTypeFromEntry()
-  const initialSessionType = props.initialConversation
-    ? resolveInitialSessionType(props.initialConversation, defaultInitialSessionType)
-    : defaultInitialSessionType
+  const initialSessionType = resolveAccessibleSessionType(
+    props.initialConversation
+      ? resolveInitialSessionType(props.initialConversation, defaultInitialSessionType)
+      : defaultInitialSessionType,
+    defaultInitialSessionType
+  )
   const shouldPersistLocalSnapshot = props.entrySource !== 'detail'
   const conversationInitialState = props.initialConversation
     ? buildConversationSessionState(props.initialConversation, initialSessionType)
@@ -188,7 +217,7 @@ export function useTravelReimbursementSessionState({
   const draftClaimId = ref(initialSessionState.draftClaimId)
   const reviewFilePreviews = ref(initialSessionState.reviewFilePreviews)
   const sessionSnapshots = ref(
-    ASSISTANT_SESSION_TYPES.reduce((result, sessionType) => {
+    resolveAccessibleSessionTypes().reduce((result, sessionType) => {
       result[sessionType] = null
       return result
     }, {})
@@ -202,7 +231,7 @@ export function useTravelReimbursementSessionState({
   function buildPersistableSessionState(sessionState) {
     const state = sessionState || captureCurrentSessionState()
     return {
-      sessionType: normalizeAssistantSessionType(state.sessionType, resolveDefaultSessionTypeFromEntry()),
+      sessionType: resolveAccessibleSessionType(state.sessionType, resolveDefaultSessionTypeFromEntry()),
       messages: serializeSessionMessages(state.messages),
       conversationId: String(state.conversationId || '').trim(),
       draftClaimId: String(state.draftClaimId || '').trim(),
@@ -258,7 +287,10 @@ export function useTravelReimbursementSessionState({
   function applySessionState(sessionState) {
     const runtimeRefs = getSessionRuntimeRefs()
     const nextState = sessionState || buildEmptySessionState(activeSessionType.value)
-    activeSessionType.value = normalizeAssistantSessionType(nextState.sessionType, resolveDefaultSessionTypeFromEntry())
+    activeSessionType.value = resolveAccessibleSessionType(
+      nextState.sessionType,
+      resolveDefaultSessionTypeFromEntry()
+    )
     messages.value = Array.isArray(nextState.messages) && nextState.messages.length
       ? nextState.messages
       : [
@@ -301,7 +333,7 @@ export function useTravelReimbursementSessionState({
   }
 
   async function loadLatestSessionState(targetSessionType) {
-    const normalizedTarget = normalizeAssistantSessionType(targetSessionType, resolveDefaultSessionTypeFromEntry())
+    const normalizedTarget = resolveAccessibleSessionType(targetSessionType, resolveDefaultSessionTypeFromEntry())
     const payload = await fetchLatestConversation(resolveCurrentUserId(), normalizedTarget, {
       preferRecoverable: normalizedTarget === SESSION_TYPE_EXPENSE
     })
@@ -312,7 +344,7 @@ export function useTravelReimbursementSessionState({
   }
 
   async function switchSessionType(targetSessionType) {
-    const normalizedTarget = normalizeAssistantSessionType(targetSessionType, resolveDefaultSessionTypeFromEntry())
+    const normalizedTarget = resolveAccessibleSessionType(targetSessionType, resolveDefaultSessionTypeFromEntry())
     if (normalizedTarget === activeSessionType.value || sessionSwitchBusy.value) {
       return
     }