llaxmi/air-canvas — reverse-engineered prompt

Build me a little browser app called Air Canvas where I can draw in the air with my hand using my webcam. I want it to feel playful and polished, like I am painting invisible strokes that turn into soft 3D clay lines floating in space. Show a live hand overlay with the full hand points so I can tell tracking is working. Make drawing happen when I point with just my index finger and keep the other fingers down, then stop drawing when I open my hand or use more fingers.

The strokes should look smooth and organic, with gentle motion and a nice rotating, floating feel after they are drawn. Give each new stroke a pleasing color from a small curated palette. I also want to be able to orbit, pan, and zoom around the 3D drawing with the mouse, and have a simple trash button to clear everything.

Please make it run locally in the browser, ask for camera access, and use current docs online if you need to.