Add an undo/redo or restore feature, like the ones in Opencode and Claude Code.

[acheong08]

#1300

This probably belongs in discussion rather than issues since it's a new feature.

I was able to implement something that works quite quickly: main...acheong08:crush:feat/undo-message

Currently for personal use but willing to open a PR if desired

[andreynering]

Hi @acheong08, 👋

Your PR looks good (skinned the code, didn't test), but worth noticing that there is already an existing PR in the topic:

• feat: delete messages below, fork conversation #2051

We didn't advance yet because we wanted to get the UX right, but you're free to test and give feedback.

[acheong08]

Thanks. I didn't notice it because I was only searching for "undo" 😅

I'll rebase & try out the PR.