handleWait function

async function handleWait(step: FlowStep): Promise<StepResult> {
  const timeout = step.waitTimeout ?? 10_000;

  if (!step.selector) {
    // Simple delay
    await sleep(timeout);
    return { status: "success" };
  }

  // Wait for element to appear
  const start = Date.now();
  while (Date.now() - start < timeout) {
    if (findElement(step)) {
      return { status: "success" };
    }
    await sleep(200);
  }

  return { status: "timeout" };
}