jal-co/shieldcn — reverse-engineered prompt

Build me a polished little service called shieldcn for people who want their GitHub README to look great without making custom graphics.

I want it to generate embeddable image URLs for README pieces like badges, headers, charts, contributor sections, and sponsor walls, with a clean shadcn/ui look instead of the usual plain badge style. It should feel like a nicer alternative to shields.io, so someone can paste a markdown image tag into a README and get a good looking result right away. Please support examples like package badges, GitHub stars, license, contributors, last commit, and simple charts for repo stats.

Also make it feel like a real product, with a homepage, docs, and a simple studio or playground where people can preview and customize what they are generating, including light and dark modes and a few visual options like logo, size, theme, and border. Keep the experience modern and tasteful. If you need details, look up current docs online and fill in the gaps sensibly.