sayanx64/statmux ? reverse-engineered prompt

Build me a web app that helps developers see all their coding activity in one place, across GitHub, Codeforces, and LeetCode.

I want a clean dashboard where someone can sign in with GitHub, add their handles for the other platforms, and then refresh their stats to pull everything together automatically. It should show a simple Code Health score with an easy grade and score, plus a timeline of recent activity like commits, pull requests, and contest submissions. I also want public profile pages that can be shared with a link, and a compare page where two developers can be viewed side by side with clear winner badges and metric breakdowns.

Please include avatar upload support, weekly email digests with unsubscribe, and a way to keep data in sync in the background. Make it feel polished and modern, with a nice profile card style and a strong focus on readability. If you need to check current docs for any of the services, go ahead and look them up online.