AniruddhaChattopadhyay/frameshot ? reverse-engineered prompt

Build me a small web app where I can paste any website link and instantly turn it into a polished screenshot inside a sleek macOS style browser frame. I want a simple page with a preview area, controls for choosing common sizes like desktop, tablet, mobile, and a few social media formats, plus the option to type in custom width and height. It should capture the site reliably on the server and let me download the result as a PNG with one click.

Keep the design clean and modern, with a focus on making the screenshots look good right away. Make sure it feels fast and easy to use, and if you need to check current docs for the screenshot tools or deployment details, go ahead and look them up online.