Main branch, hiding merged and worktrees!

[tannewt]

Hi folks,
Thanks for the great project! I've been looking for something like this. I've used Claude to do a few things for myself and want to gauge interest in upstreaming them. Here is a screenshot:

I've added:

• Designating a main branch.
• Hiding branch that have been merged into the main branch.
• Worktree support. This lists the worktrees and their current branch on the left. It also creates mock commits for each on in the graph. Clicking either the mock commit or worktree folder will show changes in that working directory.

My changes are here: https://github.com/tannewt/gitfourchette/tree/tannewt

I'm also interested in adding GitHub integration via gh for showing Actions CI and PR status.

What do folks think?

Cheers.