feat(preferences): 2FA activation dialog with mocked state (#605)

app/assets/javascripts/preferences/panes/two-factor-auth/download-secret-key.tsx

@@ -0,0 +1,13 @@
+// Temporary implementation until integration
+export function downloadSecretKey(text: string) {
+  const link = document.createElement('a');
+  const blob = new Blob([text], {
+    type: 'text/plain;charset=utf-8',
+  });
+  link.href = window.URL.createObjectURL(blob);
+  link.setAttribute('download', 'secret_key.txt');
+  document.body.appendChild(link);
+  link.click();
+  link.remove();
+  window.URL.revokeObjectURL(link.href);
+}