As far as I know right now, no editors have great built-in support. As a heavy CLI user of (previously) git and now jj, selecting changes graphically is genuinely the one thing I’m envious of. The TUI that jj uses for interactive changes, `scm-record`, is fine but not great. It gets the job done but it could be so much more.
Getting really good diff and conflict editor support into VS Code, Zed, et al is going to be a huge win when it comes.