Pinned/sticky messages

It would be great to be able to be able to pin messages (sticky) (as room moderator) which are floated to the top of the chat room. The moderator should be able to set a date for it: 1 day, 3 days, 7 days, 2 weeks, 1 month or forever. The moderator must obviously be able to unpin it at any time.

The regular users should be able to unpin it for themselves by clicking on an X.

Here's an example: pinned messages

This could be useful for stuff like linking to polls for a temporary time.

Relevant code

Edited by 🤖 GitLab Bot 🤖