[Feature Request] To be able to extend exploding times

It would be useful add more time to an almost exploding message (with a few seconds left to explode). Perhaps in the same menu next to "Explode Now".

Thanks.

No files, tests, or entry points are named. Start by locating the chat UI and timer handling for messages that are close to exploding, then determine how the existing "Explode Now" menu is implemented. Done means users can add time to an imminent explosion from the relevant menu and the updated timing is reflected reliably.

Written by the indexing model from the issue text.