Modal

A `Card` centered in the viewport with a dimmed backdrop that blocks interaction with the rest of the page, built on [Radix `Dialog`](https://www.radix-ui.com/primitives/docs/components/dialog) for focus trapping, Escape-to-close, and outside-click-to-close. It has no opinion on what goes inside the panel — an optional `title` renders a header with a close button, otherwise just the `children` are shown.