pcottle/learnGitBranching ? reverse-engineered prompt

Build me an interactive web app that teaches Git by showing what happens visually when someone types commands. I want it to feel like a little game for learning Git, with a command box, a commit tree diagram that updates instantly, and a starter sandbox where people can try things like commit, branch, checkout, merge, rebase, clone, undo, and reset without breaking anything.

Please include guided lessons and challenges, with a way to see available levels and track which ones are completed. Add a simple score idea where using fewer commands is better. It should also support sharing a lesson or sandbox state through a link that can run commands on load.

I’d like a basic level builder too, where someone can create a custom challenge, export it as JSON, and import a shared one later. Keep it all running in the browser with no backend needed. Make it clean, simple, and beginner friendly. Look up current docs online if you need to.