/**
 * iOS Safari often scrolls overlay ancestors (despite `overflow: hidden`) when
 * focusing the composer or when the visual viewport moves with the keyboard.
 * Zero those offsets so the flex footer stays pinned to the panel bottom.
 */
/**
 * Reset scroll offsets on the mobile chat overlay surfaces. Pass the
 * `.vt-container` (or any descendant — we walk up to it). Also zeros the
 * shadow host when present (iOS can scroll that node too).
 */
export declare function resetChatOverlayScroll(from: Element | null): void;