/** * Parse a JSON string, returning `null` on empty input or parse failure. * @param value - JSON string value. * @returns Parsed JSON value or null. */export function parseJsonOrNull(value: unknown): unknown | null {  if (value === null || value === undefined) return null;  if (typeof value !== "string") return value;  const trimmed = value.trim();  if (!trimmed) return null;  try {    return JSON.parse(trimmed) as unknown;  } catch {    return null;  }}