feat(导航): 实现小程序底部导航激活状态与跳转优化

添加 CHECKIN_ACTIVE_TAB 常量及 resolveCheckinActiveTab 函数，用于解析路由参数中的激活标签页
重构 JlsBottomNav 组件，使用新的解析函数并实现根据 activeTab 高亮对应导航项
将小程序内跳转从 navigateTo 改为 redirectTo 以避免页面栈累积
更新相关单元测试以覆盖新增功能

@@ -6,7 +6,9 @@ describe('checkin nav mode helpers', function () {
   it('resolves nav mode and map height from route query', async function () {
     const {
       CHECKIN_NAV_MODE,
+      CHECKIN_ACTIVE_TAB,
       resolveCheckinNavMode,
+      resolveCheckinActiveTab,
       getCheckinMapHeight,
     } = await import('../src/views/checkin/nav-mode.js');
 
@@ -17,6 +19,13 @@ describe('checkin nav mode helpers', function () {
       CHECKIN_NAV_MODE.LEGACY,
     );
 
+    expect(resolveCheckinActiveTab({ activeTab: 'home' })).to.equal(CHECKIN_ACTIVE_TAB.HOME);
+    expect(resolveCheckinActiveTab({ activeTab: 'message' })).to.equal(
+      CHECKIN_ACTIVE_TAB.MESSAGE,
+    );
+    expect(resolveCheckinActiveTab({ activeTab: 'mine' })).to.equal(CHECKIN_ACTIVE_TAB.MINE);
+    expect(resolveCheckinActiveTab({ activeTab: 'unexpected' })).to.equal('');
+
     expect(
       getCheckinMapHeight({
         isMiniProgramWebView: false,

@@ -23,6 +23,7 @@ import HomeIcon from '@nutui/icons-vue/dist/es/icons/Home.js';
 import MessageIcon from '@nutui/icons-vue/dist/es/icons/Message.js';
 import MyIcon from '@nutui/icons-vue/dist/es/icons/My.js';
 import wx from 'weixin-js-sdk';
+import { resolveCheckinActiveTab } from '@/views/checkin/nav-mode.js';
 
 const ACTIVE_COLOR = '#a67939';
 const INACTIVE_COLOR = '#8b95a7';
@@ -39,16 +40,12 @@ const navItems = [
   { name: 'mine', path: '/pages/mine/index', icon: MyIcon, label: '我的' },
 ];
 
-const reservedActiveTab = computed(() => {
-  const rawTab = Array.isArray(route.query.activeTab) ? route.query.activeTab[0] : route.query.activeTab;
-  return String(rawTab || '').trim().toLowerCase();
+const currentActiveTab = computed(() => {
+  return resolveCheckinActiveTab(route.query || {});
 });
 
-const isActive = () => {
-  // 地图页目前不属于 JLS tab 列表中的任何一项。
-  // activeTab 参数先预留，待业务确认后再决定是否映射到某个 tab 并启用高亮。
-  void reservedActiveTab.value;
-  return false;
+const isActive = (name) => {
+  return currentActiveTab.value === name;
 };
 
 const getIconColor = (name) => {
@@ -60,8 +57,8 @@ const navigate = (path) => {
     return;
   }
 
-  if (wx?.miniProgram?.navigateTo) {
-    wx.miniProgram.navigateTo({
+  if (wx?.miniProgram?.redirectTo) {
+    wx.miniProgram.redirectTo({
       url: path,
       fail: () => {
         wx?.miniProgram?.reLaunch?.({ url: path });

@@ -4,6 +4,12 @@ export const CHECKIN_NAV_MODE = {
   NONE: 'none',
 };
 
+export const CHECKIN_ACTIVE_TAB = {
+  HOME: 'home',
+  MESSAGE: 'message',
+  MINE: 'mine',
+};
+
 const NAV_HEIGHT = '80px';
 
 export function resolveCheckinNavMode(query = {}) {
@@ -32,3 +38,22 @@ export function getCheckinMapHeight({
 
   return `calc(100vh - ${navHeight})`;
 }
+
+export function resolveCheckinActiveTab(query = {}) {
+  const rawTab = Array.isArray(query.activeTab) ? query.activeTab[0] : query.activeTab;
+  const normalizedTab = String(rawTab || '').trim().toLowerCase();
+
+  if (normalizedTab === CHECKIN_ACTIVE_TAB.HOME) {
+    return CHECKIN_ACTIVE_TAB.HOME;
+  }
+
+  if (normalizedTab === CHECKIN_ACTIVE_TAB.MESSAGE) {
+    return CHECKIN_ACTIVE_TAB.MESSAGE;
+  }
+
+  if (normalizedTab === CHECKIN_ACTIVE_TAB.MINE) {
+    return CHECKIN_ACTIVE_TAB.MINE;
+  }
+
+  return '';
+}