Function parseExplainFileParam

src/utils/explainImport.ts:19–25

(search: string)

 * Returns `null` when missing, empty, or whitespace-only.
 */
export function parseExplainFileParam(search: string): string | null {
  const params = new URLSearchParams(search);
  const raw = params.get("file");
  if (!raw) return null;
  const trimmed = raw.trim();
  return trimmed.length > 0 ? trimmed : null;
}

/**
 * Minimal structural check that catches obvious non-EXPLAIN inputs before we