feat: 优化移动端学习与证书体验

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

src/views/basic-elements/light/index.vue

@@ -106,6 +106,13 @@ const markCurrentLearningVideoWatched = () => {
   )
 }
 
+const currentVideoWatched = computed(
+  () =>
+    basicElementsStore.learningVideosWatched[
+      getLearningVideoKey(currentVideoIndex.value)
+    ] === true,
+)
+
 //按顺序播放
 const currentVideo = computed(
   () => navigationSteps.value[currentVideoIndex.value].videoUrl,
@@ -266,6 +273,7 @@ onBeforeRouteLeave((to) => {
       :controls="true"
       :hideNativeControls="true"
       :anchors="[]"
+      :seekable="currentVideoWatched"
       @play="handlePlay"
       @ended="onEnded"
     >