调整讲解入口为悬浮按钮

src/components/navigation/GuideBottomNav.vue

@@ -2,7 +2,7 @@
   <view class="guide-bottom-nav">
     <view class="guide-bottom-nav-inner">
       <view
-        v-for="tab in GUIDE_TOP_TABS"
+        v-for="tab in bottomNavTabs"
         :key="tab.id"
         class="guide-bottom-tab"
         :class="[`tab-${tab.id}`, { active: activeTab === tab.id }]"
@@ -31,6 +31,8 @@ import {
   type GuideTopTab
 } from '@/utils/guideTopTabs'
 
+const bottomNavTabs = GUIDE_TOP_TABS.filter((tab) => tab.id !== 'explain')
+
 withDefaults(defineProps<{
   activeTab?: GuideTopTab
 }>(), {
@@ -64,7 +66,7 @@ const handleTabTap = (tab: GuideTopTab) => {
 .guide-bottom-nav-inner {
   height: 56px;
   display: grid;
-  grid-template-columns: repeat(2, minmax(0, 1fr));
+  grid-template-columns: minmax(0, 1fr);
   gap: 10px;
   padding: 4px;
   box-sizing: border-box;