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test(video-player): 添加 MediaProgressSliderState 单元测试 - 解决播放器实际位置滞后导致的进度条回跳 - 新增 isSeeking 状态与 targetPositionMillis 记录目标 - 在 seek 完成前强制 UI 显示目标位置而非实际位置 - 添加轮询检测机制，当位置误差小于 500ms 时结束 seeking - 测试基本的拖动操作与状态同步 - 测试快速连续拖动时的状态更新逻辑 - 测试 seek 完成的判定条件及误差范围 - 测试预览比例为 NaN 时的边界情况
- 增加 `isPreviewing` 状态断言，验证预览期间及结束后的状态 - 模拟播放器位置追赶过程，确保未到达目标时保持预览状态 - 调用 `checkSeekingComplete` 验证到达目标后状态正确切换 - 移除未使用的 `mutableStateOf` 导入
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补充了单元测试验证 |
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问题原因
这个问题的根本原因是 异步操作导致的竞态条件 ：
快速拖动的问题 ：
解决方案
引入"Seeking 状态"来保持进度条显示的一致性：
修改效果
修改前：
拖动进度条到 2:00 → 松开手指 → 进度条瞬间跳回 1:00 → 等待 → 进度条跳到 2:00
快速拖动 A→B → 进度条可能短暂跳回 A 点
修改后：
拖动进度条到 2:00 → 松开手指 → 进度条保持显示 2:00 → 播放器位置到达 2:00 → 正常播放
快速拖动 A→B → 进度条保持显示 B 点，不会跳回 A