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fix: 修复预览播放器视频无法播放和标题不显示(二次修复) #1424

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xiaoxia wants to merge 1 commits from fix/preview-player-v2 into develop
pull from: fix/preview-player-v2
merge into: xiaoxia:develop
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Author SHA1 Message Date
张宏杰 3ddde4c650 fix: 修复预览播放器视频无法播放和标题不显示
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修复3个根因：
1. useSegmentScheduler: 用 srcLoadedRef 替代 video.src 检查
   - video.src='' 在浏览器中被解析为页面URL，导致条件永远为false
   - switchToSegment 先绑事件再设src，加 readyState 检查和10s超时
   - 显式调用 video.load() 确保加载启动
2. FrontendPreviewPlayer: 移除嵌套的 .xx-preview-video 容器
   - 改为 Fragment + absolute 定位，避免双层 overflow:hidden 冲突
   - 视频/控制条/播放按钮直接填充父容器
3. PreviewVideoPanel: 简化为单一 .xx-preview-video 容器
   - TitleOverlay z-index:20 确保在视频(z:1)和控制条(z:10)之上
 2026-08-18 17:43:40 +08:00