优化用户名显示方式

public/index.html

@@ -51,7 +51,6 @@
                     <button id="clear-transcode-cache-btn" class="action-btn" title="清空转码缓存">清空转码缓存</button>
                 </div>
                 <div class="user-info">
-                    <span id="current-username"></span>
                     <button id="logout-btn" class="action-btn danger">退出登录</button>
                 </div>
             </div>
@@ -60,7 +59,7 @@
         <main class="dashboard">
             <section class="video-list-section glass-panel">
                 <div class="section-header">
-                    <h2>Available Videos</h2>
+                    <h2 id="video-list-header">Available Videos</h2>
                 </div>
                 <div class="bucket-panel">
                     <label for="bucket-select">Select Bucket</label>