clock 4

A current date+time clock (to the second) in the composer tool row, for the DeepSeek Harness

省钱时钟：主人为了提醒自己别在高峰时段（北京时间 9:00-12:00、14:00-18:00）使用贵价 API，让 AI 写了这个可拖拽缩放的浮动时钟——高峰时闪烁红灯警示，颜色与闪烁均可自定义。

Per-turn clock and idle-gap context for DeepSeek Harness: one-line timestamp reading (weekday, date, time, UTC offset, IANA timezone) and previous turn end time at every conversation turn start, without breaking UI turn branching. dsh-message-datetime：每轮对

时间提醒（reminder）— DSH 会话头部的时间模块：现在时间 / 距上次发言 / 提醒 / 倒计时。定位是会话内的短期提醒（纯 client 半，数据存浏览器本地）