/**
 * Attaches {@link handleButtonClick} to every button that carries the
 * `prevent-multiple-clicks` CSS class so that double-submissions are blocked
 * across the page.
 *
 * Safe to call multiple times — adding the same listener twice on a given
 * element has no effect (the browser deduplicates identical listener/options
 * pairs).
 */
export function initDebounceClick(): void;
