Add Cypress E2E tests with fixture-based API mocking for UI regression protection

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

cypress/e2e/accountAdmin.cy.js

@@ -0,0 +1,29 @@
+import { loginWithFixtures } from '../support/intercept';
+
+describe('Account Management', () => {
+  beforeEach(() => {
+    loginWithFixtures();
+  });
+
+  it('displays user list on account admin page', () => {
+    cy.visit('/account-admin');
+    cy.wait('@getUsers');
+    // Should display users from fixture
+    cy.contains('Test Admin').should('exist');
+    cy.contains('Alice Wang').should('exist');
+    cy.contains('Bob Chen').should('exist');
+  });
+
+  it('shows active/inactive status badges', () => {
+    cy.visit('/account-admin');
+    cy.wait('@getUsers');
+    // The user list should show status indicators
+    cy.contains('testadmin').should('exist');
+  });
+
+  it('navigates to my-account page', () => {
+    cy.visit('/my-account');
+    cy.wait('@getMyAccount');
+    cy.url().should('include', '/my-account');
+  });
+});