Function dedupe

src/session/store.ts:13–18

De-dupe preserving order.

(xs: string[])

/** De-dupe preserving order. */
function dedupe(xs: string[]): string[] {
  const seen = new Set<string>();
  const out: string[] = [];
  for (const x of xs) { if (!seen.has(x)) { seen.add(x); out.push(x); } }
  return out;
}

/**
 * Turn free-text into a safe FTS5 MATCH expression: each token is double-quoted (neutralizing