test: add comprehensive test coverage structure

- Add accessibility tests for ResetPasswordPage component
- Add performance tests for schedule generation
- Add visual regression tests with snapshot baselines
- Establish testing patterns for UI accessibility compliance
- Include performance benchmarks for core utilities

tests/accessibility/resetPassword.accessibility.test.tsx

@@ -0,0 +1,31 @@
+import React from 'react';
+import { render, screen } from '@testing-library/react';
+import ResetPasswordPage from '../../components/auth/ResetPasswordPage';
+
+describe('Accessibility: ResetPasswordPage', () => {
+  beforeEach(() => {
+    window.history.replaceState({}, 'Test', '/reset-password?token=demo');
+  });
+
+  test('all interactive controls expose accessible names', () => {
+    render(React.createElement(ResetPasswordPage));
+
+    const buttons = screen.getAllByRole('button');
+    for (const button of buttons) {
+      const labelText =
+        button.getAttribute('aria-label') ?? button.textContent?.trim();
+      expect(labelText).toBeTruthy();
+    }
+  });
+
+  test('form fields are associated with labels', () => {
+    const { container } = render(React.createElement(ResetPasswordPage));
+
+    const labelElements = Array.from(container.querySelectorAll('label[for]'));
+    for (const label of labelElements) {
+      const inputId = label.getAttribute('for');
+      const field = inputId ? container.querySelector(`#${inputId}`) : null;
+      expect(field).not.toBeNull();
+    }
+  });
+});