/**
 * Make everything BEHIND a body-level Vendo surface inert, and put it back.
 *
 * Both of the surfaces that escape to `document.body` need this: the overlay
 * panel (a modal dialog) and the mobile takeover page (which covers the host's
 * viewport whole). `position: fixed` plus a scrim stops the mouse; only `inert`
 * stops the keyboard and the screen reader from walking into the host page
 * underneath a surface that is visually covering it.
 *
 * Returns the release function — call it on close AND on unmount-while-open.
 */
export declare function inertBehind(wrapper: Element | null): () => void;