ovity/octotree — reverse-engineered prompt

Build me a simple browser extension for GitHub, basically an old school Octotree style experience.

I want a sidebar file tree that shows the folders and files for a repo so I can explore code without drilling into page after page. It should also help on pull request pages, making it easier to jump between changed files and review code faster. Keep it feeling native to GitHub, fast, clean, and easy to use, not a whole new app.

Please make it work as a basic extension for modern browsers like Chrome, Firefox, Edge, Safari, and Opera if that is realistic from the codebase, but it is fine to focus on a limited core version first. Use the existing repo as the starting point and preserve the simple JavaScript extension setup already here.

I do not need paid or advanced proprietary features, just a solid lightweight version that improves GitHub navigation and code review. If anything is unclear, look up current browser extension docs online and make sensible choices.