test(frontend): extend coverage for comfyui widgets and helpers

scripts/api.js

@@ -0,0 +1,7 @@
+export const api = {
+  fetchApi: (...args) => fetch(...args),
+  addEventListener: (eventName, handler) => document.addEventListener(eventName, handler),
+  removeEventListener: (eventName, handler) => document.removeEventListener(eventName, handler),
+};
+
+export default api;