fix: clear media lists when switching tabs

Drop cached liveStreams/videos on same-route tab changes and reload
fresh list data so stale live center cards do not linger.

src/views/MediaView/MediaView.vue

@@ -269,16 +269,20 @@ async function download(v) {
   }
 }
 
-// 同路由 tab 切换不会卸载组件；离开直播中心时必须清播放态/心跳/viewer lease
+// 同路由 tab 切换不会卸载组件：离开时清会话/列表缓存，进入时重新拉 list
 watch(view, async (next, prev) => {
-  if (prev === 'live' && next !== 'live') {
+  if (!prev || next === prev) return
+
+  if (prev === 'live') {
     openSeq += 1
     await closeActiveLive()
-    return
+    liveStreams.value = []
   }
-  if (next === 'live' && prev && prev !== 'live') {
-    await load()
+  if (prev === 'videos') {
+    videos.value = []
   }
+
+  await load()
 })
 
 onMounted(load)