segmentio/evergreen ? reverse-engineered prompt

Build me a polished React UI component library for enterprise web apps, something like Evergreen. I want a clean set of reusable components with sensible defaults, but also enough flexibility to customize them when needed. It should include the usual building blocks like buttons, inputs, layout pieces, overlays, and form controls, plus a solid theming system so the look and feel can be adjusted across an app.

Make it work well out of the box, and make sure it supports server side rendering without extra hassle. Please include a simple docs and examples setup so people can see how to use the components quickly, and add a basic storybook style preview if that fits. Keep the codebase organized, with good TypeScript support where it helps, and make the public API easy to import one component at a time. If you need to check current docs or best practices online, go ahead.