视频没有占位符修复

client/public/onebyone/renderer.js

@@ -290,6 +290,15 @@ class UIRenderer {
             const shouldShowPlaceholder = !remoteUser.mediaState.video;
             toggleElement(this.elements.remoteVideoPlaceholder, shouldShowPlaceholder);
 
+            // 当远程视频关闭时，隐藏视频元素本身，避免冻结画面透过占位符
+            if (this.elements.remoteVideo) {
+                if (shouldShowPlaceholder) {
+                    this.elements.remoteVideo.style.opacity = '0';
+                } else {
+                    this.elements.remoteVideo.style.opacity = '1';
+                }
+            }
+
             // 更新占位符文本内容
             if (shouldShowPlaceholder) {
                 const placeholderContent = this.elements.remoteVideoPlaceholder.querySelector('.text-center');