sendToTab function ✓ 100.0%

async function sendToTab(
  tabId: number,
  tabUrl: string | undefined,
  message: ExtensionMessage,
): Promise<unknown> {
  const url = tabUrl ?? "";
  if (!url.startsWith("http://") && !url.startsWith("https://")) {
    return { error: "Content script not available on this page" };
  }

  try {
    return await chrome.tabs.sendMessage(tabId, message);
  } catch (initialError) {
    return {
      error: "Content script not responding",
      details: String(initialError),
    };
  }
}