jordao76/fractions ? reverse-engineered prompt

Build me a simple fraction calculator web app that lets people enter fraction expressions and get the answer right away.

I want it to feel clean and easy to use, with a basic interface where someone can type in fractions, do calculations, and see the result in fraction form. It should handle the usual math operations and be good enough for quick school style calculations. Please make sure the app works well in the browser, has a polished but simple layout, and includes tests so the core calculations are reliable.

If anything needs a quick check against current docs or best practices, look it up online. Also make sure it can be run locally for development and built for production without extra hassle.