export function safeNotificationActionUrl(value: string | null | undefined): string | null {
  const candidate = value?.trim();
  if (
    !candidate
    || !candidate.startsWith("/")
    || candidate.startsWith("//")
    || candidate.includes("\\")
    || [...candidate].some((character) => {
      const codePoint = character.codePointAt(0) ?? 0;
      return codePoint < 32 || codePoint === 127;
    })
  ) {
    return null;
  }
  return candidate;
}