TabularisDB/explain-plan ? reverse-engineered prompt

Build me a simple web app where I can paste a database EXPLAIN plan and immediately see it turned into something easy to understand.

I want it to support PostgreSQL, MySQL or MariaDB, and SQLite, and it should be able to figure out the format from the text or let me choose it myself. The main experience should be an interactive visualizer with a graph view, a diagram view, a table view, and a stats view, plus automatic findings that point out possible performance issues.

Keep everything running in the browser only, so nothing gets sent to a server and no query is ever executed. Use a clean dark theme that feels polished and modern. Make it feel like a real public product, with good empty states, helpful error messages, and a nice landing page. If you need current docs for any libraries or browser behavior, look them up online first.