profharsh2026-prog/commitpulse ? reverse-engineered prompt

Build me a Next.js app that turns a GitHub user’s contribution history into a really polished SVG badge for profile READMEs.

I want an API endpoint where I can pass a username and get back a cinematic 3D isometric contribution monolith, with streak stats, theme options, and custom colors. It should support a few preset looks like dark, neon, light, and high contrast, plus let me override things like background, accent, text, size, and rounded corners through query params. If you can, also include a heatmap style view and a simple comparison view for two users.

Make it feel fast and production ready, with cached responses, GitHub data syncing, and clean error handling when a username is missing or invalid. The SVG should look good in both light and dark mode, and it should be easy to drop straight into a GitHub profile README. Look up current docs online if you need to, and make sure the final result is usable right away.