/** Returns the page numbers to render: 1, ellipsis, current±1, ellipsis, last. */
export function getPageNumbers(page: number, totalPages: number): (number | 'ellipsis')[] {
  if (totalPages <= 7) return Array.from({ length: totalPages }, (_, i) => i + 1);
  const pages: (number | 'ellipsis')[] = [1];
  if (page > 3) pages.push('ellipsis');
  const start = Math.max(2, page - 1);
  const end = Math.min(totalPages - 1, page + 1);
  for (let i = start; i <= end; i++) pages.push(i);
  if (page < totalPages - 2) pages.push('ellipsis');
  pages.push(totalPages);
  return pages;
}