Add comprehensive tests for authentication, settings, and password reset pages

- Introduced smoke tests for Login, Register, Password Reset, Password Reset Confirm, and Settings pages.
- Enhanced test coverage for all dynamic imports using mocks and added Jest exclusions for non-testable Next.js files.
- Added component-specific test files for better structure and maintainability.
- Improved test isolation by mocking navigation, providers, and rendering contexts.

frontend/tests/app/(authenticated)/settings/page.test.tsx

@@ -0,0 +1,25 @@
+/**
+ * Tests for Settings Index Page
+ * Verifies redirect behavior
+ */
+
+import { redirect } from 'next/navigation';
+import SettingsPage from '@/app/(authenticated)/settings/page';
+
+// Mock Next.js navigation - redirect throws to interrupt execution
+jest.mock('next/navigation', () => ({
+  redirect: jest.fn(() => {
+    throw new Error('NEXT_REDIRECT');
+  }),
+}));
+
+describe('SettingsPage', () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  it('redirects to /settings/profile', () => {
+    expect(() => SettingsPage()).toThrow('NEXT_REDIRECT');
+    expect(redirect).toHaveBeenCalledWith('/settings/profile');
+  });
+});