调整导览讲解为底部主导航

src/pages/explain/list.vue

@@ -2,6 +2,8 @@
   <GuidePageFrame
     active-tab="explain"
     variant="static"
+    :show-top-tabs="false"
+    show-bottom-nav
     show-back
     back-label="讲解首页"
     @tab-change="handleTopTabChange"
@@ -27,6 +29,7 @@
         :visible="showAudioPlayer"
         :audio="currentAudio"
         :auto-play="true"
+        avoid-bottom-nav
         @update:visible="handleAudioVisibleChange"
         @play="handleAudioPlay"
         @pause="handleAudioPause"