franpizzimenti/renderz-from-queries — reverse-engineered prompt

Build me a web app called RosaC for football squad optimization. It should feel like a modern online version of an existing Excel tool, keeping the same calculations, formulas, and Power Query style logic as closely as possible.

Users should be able to bring in Excel data from places like OneDrive or a web link, process it in the app, and see the squad results quickly without having to run everything manually in Excel. The interface should be clean and easy to use, with tables, filters, clear results, and a workflow that makes sense for someone who already knows the spreadsheet.

Please set it up as a real cloud ready app with a frontend, backend, database, and tests. Use the stack that already fits this repo. Make sure it can run locally, has sensible environment setup, and is ready to deploy on Vercel. Look up current docs online if you need to.