UI kit

@domdoc/ui is a copy-in component kit in the shadcn style. It ships a Tailwind v4 theme and one source set per framework: a toolbar, zoom controls, search, mode select, theme toggle, file button, and page status. The components sit on top of the headless viewer store from @domdoc/core. Run npx @domdoc/ui init once, then npx @domdoc/ui add <block> to copy a block into your project, where you can edit it.