handleNavigate function

function handleNavigate(step: FlowStep): StepResult {
  if (!step.url) {
    return { status: "failed", error: "Navigate step missing url" };
  }
  // Navigation handled by orchestrator via chrome.tabs.update — this is a no-op
  // when executed in content script context. Return success so orchestrator proceeds.
  return { status: "success" };
}