MengTo/threeui ? reverse-engineered prompt

Build me a polished Three.js component gallery app like ThreeUI Community.

I want a public site where people can browse a grid of interactive UI components, search through them, open a component page, and play with live previews, controls, variant switching, and source code tabs. It should feel like a real product catalog, with smooth navigation, responsive layout, and light and dark themes. Please make it login free, with no account or checkout flow, and keep the focus on the free community components only.

I also want the app to include the actual component source for the community items, and for each item to have a working render preview plus the relevant controls and variants. If you need to look up current docs or best practices for Three.js or React setup, go ahead and do that. Make it clean, modern, and production ready, with the content organized so it’s easy to browse and understand.