feat: cache custom attributes in IDB

app/javascript/dashboard/store/modules/specs/attributes/actions.spec.js

@@ -1,12 +1,20 @@
 import axios from 'axios';
 import { actions } from '../../attributes';
 import * as types from '../../../mutation-types';
+import AttributeAPI from '../../../../api/attributes';
 import attributesList from './fixtures';
 
 const commit = vi.fn();
 global.axios = axios;
 vi.mock('axios');
 
+// Clear the IDB-backed cache between tests so each case starts from a known
+// empty state and isn't affected by data persisted by a previous test.
+beforeEach(async () => {
+  await AttributeAPI.dataManager.initDb();
+  await AttributeAPI.dataManager.db.clear(AttributeAPI.cacheModelName);
+});
+
 describe('#actions', () => {
   describe('#get', () => {
     it('sends correct actions if API is success', async () => {