/**
 * Sanitize HTML to only allow safe formatting tags
 *
 * Allowed tags:
 * - <br>, <br/> - Line breaks
 * - <em>, <i> - Italic
 * - <strong>, <b> - Bold
 * - <u> - Underline
 * - <span> - Generic inline container (for styling)
 * - <a> - Links (href attribute only, with target="_blank" and rel="noopener")
 *
 * All other tags and attributes are stripped.
 */
/**
 * Sanitize HTML string to only allow safe formatting tags
 *
 * @param html - The HTML string to sanitize
 * @returns Sanitized HTML string safe for innerHTML
 */
export declare function sanitizeHtml(html: string | undefined | null): string;
