feat: 添加思维导图支持，更新引导步骤组件，优化视频播放与学习进度追踪功能

src/components/QuestionQuiz/QuestionQuiz.vue

@@ -152,7 +152,7 @@ const handleSubmit = () => {
 <template>
   <div class="absolute inset-0 flex items-center justify-center px-20 pointer-events-none z-30">
     <div
-      class="bg-black/40 backdrop-blur-sm rounded-3xl border border-white/20 p-16 space-y-10 text-white pointer-events-auto"
+      class="bg-black/80 backdrop-blur-lg rounded-3xl border border-white/20 p-16 space-y-10 text-white pointer-events-auto"
     >
       <!-- 顶部：题号 -->
       <div v-if="showQuestionNumber" class="flex items-center justify-between mb-2">