Am24an/Natraj-Mixing-Lab ? reverse-engineered prompt

Build me a browser based passport photo editor that runs completely locally, so users can upload a photo and edit it without anything ever leaving their device.

I want the app to remove backgrounds automatically, let people clean up leftovers with a brush, and then replace the background with common passport colors like white, light blue, cream, or grey, plus a custom color picker. It should also crop to passport friendly sizes, let users rotate and flip the image, and include sliders for brightness, contrast, saturation, sharpness, highlights, and shadows. If the photo is low quality, add an upscale option that improves it before export.

Please make it feel polished, with light and dark modes, a responsive layout that works well on phones, and undo and redo so users can experiment safely. Save work locally in the browser so people can come back later. Keep it fast and privacy focused, and if you need current implementation details, look up the latest docs online.