Fix Replit React Deployment

My React web application runs flawlessly in Replit’s development preview, yet the production deployment comes up as a blank, black screen with no errors showing in the console. All dependencies install without complaint, the build command completes, and the Replit “successful deployment” message appears—but the live URL remains empty.

I need someone to trace whatever is breaking between build and serve, adjust the configuration (whether it’s a routing issue, environment variable, build script, or static hosting quirk), and leave the project in a state where the production instance renders exactly what the preview does.

What you’ll hand back to me:
• A working Replit deployment URL that loads the React app correctly in production.
• A brief note explaining what was wrong and the fix you applied so I can reproduce it next time.

Please be comfortable poking around Replit’s Nix environment, React build tooling (create-react-app / Vite or similar), and any CDN or routing settings inside the repl. If this sounds straightforward, I can grant temporary Replit access right away.