SuddenDevelopment/web3d ? reverse-engineered prompt

Build me a web app for creating and editing 3D scenes in the browser. I want a clean homepage where I can drag and drop a scene template, then tweak things like the main object focus, background, environment, and visual effects. It should also have a simple 2D control panel for options and settings, plus an integrated editor, animator, and material tools so I can make changes without leaving the app.

Please make it feel polished and easy to use, with a few starter templates and a default demo scene, something like the x wing example. Include a way to switch between development and production friendly settings, and show helpful tutorial links or guidance inside the app. If there are deployment or build notes that matter, bake those in so it works well on a hosting platform like Vercel. If you need to look up current docs online for anything, go ahead.