afilfarhan/signlanguage ? reverse-engineered prompt

Build me a browser based sign language learning app called SignTutor.

I want people to open it in their browser, turn on their webcam, and start learning fingerspelling and common ASL signs right away. It should guide them through lessons, show what sign to make, watch their hand movements in real time, and give simple feedback when they get it right or need to try again. Keep everything private, so the camera data and hand tracking should stay on the device and never be uploaded.

Make it feel friendly and easy to start, with a clear landing page and a big button like Start your first lesson. Include a few lesson modes for letters, common signs, and simple words if possible. It should work well in modern browsers, load fast, and use local model files for recognition. If you need to check current docs for browser camera or model loading details, feel free to look them up online.