dsh-schedule-later: Schedule Messages for Later Sending

`dsh-schedule-later` is a DSH client plugin designed to address the need for scheduled message delivery and background task reminders. Maintained by adithyanraj03, it allows users to manually select a time or instruct the model in chat to autonomously schedule message sending. Its core features include host-side message delivery (ensuring messages are still sent after the process closes), a calendar picker with a sidebar management interface, and tool interfaces that let the model schedule, query, and cancel messages. After installation, the process must be restarted and the page refreshed, after which the plugin can be used from the input box and sidebar. Use cases include scheduled reminders, checking background tasks, and automatic replies, though limitations apply, such as a maximum of 10 messages per conversation and mutual exclusivity with another plugin.