复刻 Bilibili Mac 客户端的黑暗模式过渡：在 Electron 中截取窗口，通过 Canvas 圆形裁剪逐步揭示新主题，实现从点击位置扩散与收拢的平滑动画。
Style & CSS
Frontend craft, visual details, CSS, and thoughtful interface polish.
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