refactor: 移除未使用的组件和注释代码，优化导航点击处理

移除首页和学习详情页中未使用的标签导航和直播卡片组件
将社区导航改为显示提示而非跳转
修复视频播放器的可选链访问问题

 <!--
  * @Date: 2025-03-20 20:36:36
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-03-21 10:20:44
+ * @LastEditTime: 2025-06-10 15:27:23
  * @FilePath: /mlaj/src/components/layout/BottomNav.vue
  * @Description: 文件描述
 -->
@@ -40,6 +40,7 @@
 import { computed } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
 import { useAuth } from '@/contexts/auth'
+import { showToast } from 'vant'
 
 const route = useRoute()
 const router = useRouter()
@@ -74,7 +75,8 @@ const isActive = (path) => {
 
 const handleNavClick = (item) => {
   if (item.path === '/community') {
-    window.open('https://community.mlaj.com', '_blank')
+    showToast('功能暂未开放')
+    // window.open('https://community.mlaj.com', '_blank')
     return
   }
   if (item.path === '/profile' && !currentUser.value) {

@@ -249,7 +249,7 @@
       </div>
 
       <!-- Custom Tab Navigation -->
-      <div class="sticky top-0 bg-white/70 backdrop-blur-lg" style="z-index: 9;">
+      <!-- <div class="sticky top-0 bg-white/70 backdrop-blur-lg" style="z-index: 9;">
         <div class="px-4 border-b border-gray-200">
           <div class="flex space-x-6">
             <button
@@ -273,7 +273,7 @@
             </button>
           </div>
         </div>
-      </div>
+      </div> -->
 
       <!-- Content Based on Active Tab -->
       <div class="px-4 mt-5" ref="contentRef">

@@ -24,7 +24,7 @@
       </div>
 
       <!-- Today's Live -->
-      <div class="px-4 mb-4">
+      <!--<div class="px-4 mb-4">
         <div class="flex items-center mb-2">
           <h2 class="font-medium">今日直播</h2>
           <div
@@ -38,7 +38,7 @@
           </div>
         </div>
 
-        <!-- Live Stream Cards -->
+        <!~~ Live Stream Cards ~~>
         <div class="grid grid-cols-2 gap-4">
           <LiveStreamCard
             v-for="stream in liveStreams"
@@ -46,7 +46,7 @@
             :stream="stream"
           />
         </div>
-      </div>
+      </div>-->
 
       <!-- Value Online Courses -->
       <div class="px-4 mb-4">

@@ -23,7 +23,7 @@
                     </div>
                     <!-- 视频播放器 -->
                     <VideoPlayer v-show="isPlaying" ref="videoPlayerRef"
-                        :video-url="courseFile.list.length ? courseFile['list'][0]['url'] : ''" :autoplay="false"
+                        :video-url="courseFile?.list?.length ? courseFile['list'][0]['url'] : ''" :autoplay="false"
                         @onPlay="handleVideoPlay" @onPause="handleVideoPause" />
                 </div>
                 <div v-if="course.course_type === 'audio'" class="w-full relative"