scheduled-send 2

DSH Web 定时发送插件：在输入框旁提供定时发送按钮与配置，支持智能时段（12:00–14:00 / 18:00–次日 08:00 内最近时间）、自定义日期时间、多个定时任务，并通过 localStorage 持久化任务。清新天蓝主题。

Schedule a message into a dsh chat for later: a Schedule button in the message box with a date and time picker, a sidebar panel of pending messages across chats, delivery as a normal user message even with the browser closed, and schedule_message, list_sc