Swipe to change pages滑动翻页

Horizontal: classic Touch Events with distance/time thresholds. Vertical: Pointer Events with capture. Both include buttons and arrow keys.

左右翻页：传统的 Touch Events，按距离和时间阈值判断。上下翻页：Pointer Events 加上指针捕获。两条轨道都能用按钮和方向键翻页。