✨ feat: 点击当前播放时间可切换正/倒计时

[fgt1t5y]

灵感来自youtube播放器

[gemini-code-assist]

Summary of Changes

Hello @fgt1t5y, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

此拉取请求为播放器组件引入了一项新功能，允许用户通过点击当前播放时间在已播放时长和剩余时长（倒计时）之间进行切换。这一功能灵感来源于YouTube播放器，旨在通过提供更灵活的时间跟踪选项来改善用户交互体验。

Highlights

• 播放时间显示切换功能: 实现了点击当前播放时间可在正向计时和倒计时之间切换的功能。
• 增强用户体验: 用户现在可以通过点击播放时间区域来切换显示模式，提供了更灵活的播放进度查看方式。
• 视觉反馈优化: 为播放时间区域添加了鼠标指针样式和悬停下划线效果，以明确指示其可点击性。

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[gemini-code-assist]

Code Review

这个 PR 实现了一个很棒的功能，允许用户通过点击播放时间来切换正计时和倒计时，提升了用户体验。代码实现清晰直接。我发现了一些小问题，主要是在 CSS 和时间计算的边缘情况处理上，请查看我的具体评论。