fix: 返回列表时保持之前的 tab 状态

问题：从详情页返回时，列表总是重置到"我发起的" tab

解决方案：
1. 导航到详情页时传递 state: { fromTab: activeTab }
2. 列表页从 location.state.fromTab 恢复 tab 状态

修改文件：
- frontend/src/pages/approval/list.tsx
- frontend/src/pages/business-trip/list.tsx

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/pages/approval/list.tsx

@@ -1,5 +1,5 @@
 import { useState, useEffect, useRef } from 'react'
-import { useNavigate } from 'react-router-dom'
+import { useNavigate, useLocation } from 'react-router-dom'
 import { useTranslation } from 'react-i18next'
 import { List, Card, Tag, Tabs, PullToRefresh, InfiniteScroll } from 'antd-mobile'
 import {
@@ -45,8 +45,11 @@ const businessTypeConfig: Record<string, string> = {
 export default function ApprovalList() {
   const { t } = useTranslation()
   const navigate = useNavigate()
+  const location = useLocation()
 
-  const [activeTab, setActiveTab] = useState<'my' | 'pending' | 'approved' | 'cc'>('my')
+  // 从 location.state 获取之前的 tab，默认为 'my'
+  const initialTab = ((location.state as any)?.fromTab as string) || 'my'
+  const [activeTab, setActiveTab] = useState<'my' | 'pending' | 'approved' | 'cc'>(initialTab)
   const [list, setList] = useState<ApprovalItem[]>([])
   const [loading, setLoading] = useState(false)
   const [hasMore, setHasMore] = useState(false)
@@ -144,7 +147,7 @@ export default function ApprovalList() {
 
   // 查看详情
   const handleViewDetail = (id: number) => {
-    navigate(`/approval/${id}`)
+    navigate(`/approval/${id}`, { state: { fromTab: activeTab } })
   }
 
   // 格式化日期

frontend/src/pages/business-trip/list.tsx

@@ -1,5 +1,5 @@
 import { useState, useEffect } from 'react'
-import { useNavigate } from 'react-router-dom'
+import { useNavigate, useLocation } from 'react-router-dom'
 import { useTranslation } from 'react-i18next'
 import { List, Card, Tag, Button, Tabs, PullToRefresh, InfiniteScroll } from 'antd-mobile'
 import { AddOutline, ClockCircleOutline, CheckCircleOutline, CloseCircleOutline, ExclamationCircleOutline } from 'antd-mobile-icons'
@@ -31,8 +31,11 @@ interface BusinessTripItem {
 export default function BusinessTripList() {
   const { t } = useTranslation()
   const navigate = useNavigate()
+  const location = useLocation()
 
-  const [activeTab, setActiveTab] = useState<'my' | 'pending' | 'approved'>('my')
+  // 从 location.state 获取之前的 tab，默认为 'my'
+  const initialTab = ((location.state as any)?.fromTab as string) || 'my'
+  const [activeTab, setActiveTab] = useState<'my' | 'pending' | 'approved'>(initialTab)
   const [list, setList] = useState<BusinessTripItem[]>([])
   const [loading, setLoading] = useState(false)
   const [hasMore, setHasMore] = useState(true)
@@ -97,7 +100,7 @@ export default function BusinessTripList() {
 
   // 查看详情
   const handleViewDetail = (id: number) => {
-    navigate(`/business-trip/detail/${id}`)
+    navigate(`/business-trip/detail/${id}`, { state: { fromTab: activeTab } })
   }
 
   // 新建申请