export function imageContentDisposition(displayName: string, fallbackName: string): string {
  const safeDisplayName = displayName.trim() || fallbackName;
  const fallback = safeDisplayName
    .normalize("NFKD")
    .replace(/[^a-z0-9]+/giu, "-")
    .replace(/^-|-$/gu, "") || fallbackName;
  const encoded = encodeURIComponent(`${safeDisplayName}.png`).replace(
    /['()*]/gu,
    (character) => `%${character.charCodeAt(0).toString(16).toUpperCase()}`,
  );
  return `attachment; filename="${fallback}.png"; filename*=UTF-8''${encoded}`;
}