TanmayTiwarii/prototype_faceapp ? reverse-engineered prompt

Build me a simple web app for face image segmentation and preview.

I want a page where someone can upload a photo, see the image right away, and get a segmented face result overlaid or shown beside the original. Keep it clean and easy to use, with a single main screen and a clear action to run the analysis.

There should be a small backend that handles the image processing, and the frontend should display loading, success, and error states nicely. If you need to look up current docs online for the best way to do the image handling, go ahead.

Please make it feel like a working prototype, not a polished product, but it should be usable, run locally, and be easy to deploy. Include whatever tests or sanity checks make sense for the segmentation flow so I can verify it works.