[FEATURE]: Ability to fork/revert in desktop app

[Killusions]

Feature hasn't been suggested before.

• [x] I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

The desktop app almost has feature parity with the CLI for most common uses, but the lack of revert and fork of user messages really make it hard to use, as it's pretty common for me to revert the last message or fork a thread.