exportForms function

async function exportForms(): Promise<void> {
  const forms = (await chrome.runtime.sendMessage({
    type: "GET_SAVED_FORMS",
  })) as SavedForm[];

  if (!Array.isArray(forms) || forms.length === 0) {
    showToast(t("noFormsToExport"));
    return;
  }

  const payload = JSON.stringify({ version: 1, forms }, null, 2);
  const blob = new Blob([payload], { type: "application/json" });
  const url = URL.createObjectURL(blob);

  const a = document.createElement("a");
  a.href = url;
  a.download = `fill-all-forms-${new Date().toISOString().slice(0, 10)}.json`;
  a.click();
  URL.revokeObjectURL(url);
  showToast(t("toastFormsExported", [String(forms.length)]));
}