/**
 * Lock body scroll (Non-destructive version)
 * Satisfies Req 3: Persistence of background zoom and scroll position.
 */
export function lockBodyScroll(): void;
/**
 * Unlock body scroll
 */
export function unlockBodyScroll(): void;
/**
 * Close fullscreen modal
 * Separated from modal.js to prevent circular dependency with keyboard.js
 */
export function closeModal(): Promise<void>;
/**
 * Sync branding visibility based on current configuration
 * Reactive to runtime config changes
 */
export function syncBrandingVisibility(): void;
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