mantinedev/mantine ? reverse-engineered prompt

Build me a polished React UI library in TypeScript with a lot of ready to use pieces, like buttons, inputs, layouts, overlays, and all the common app UI stuff. I want it to feel modern, easy to theme, and support dark mode well out of the box.

Also include a solid set of reusable hooks for state and UI behavior, plus extras like form handling, charts, notifications, a command palette, code highlighting, rich text editing, drag and drop file uploads, a carousel, page progress, modals, and a simple schedule view. Make the components consistent, accessible, and easy to customize.

Please set it up with a small demo and documentation style example app so I can see everything working together. If you need to check current best practices or docs for any libraries, look them up online first.