mega-issue for tracking PR diff view improvements
- graph-style commit log Probably too much for default view, but we at least need an option to see in graph mode.
- different diff engines like difftastic We should first make pierre diff engine-agnostic, so things like word-diff and hunk grouping happens on server and not from client.
- diff between unrelated files (maybe) - discord message
- jj: show diverged commits against target branch (two different commits sharing same change-id)