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/providers.test.tsx

@@ -0,0 +1,79 @@
+/**
+ * Tests for Providers Component
+ * Verifies React Query and Theme providers are configured correctly
+ */
+
+import { render, screen } from '@testing-library/react';
+import { Providers } from '@/app/providers';
+
+// Mock components
+jest.mock('@/components/theme', () => ({
+  ThemeProvider: ({ children }: { children: React.ReactNode }) => (
+    <div data-testid="theme-provider">{children}</div>
+  ),
+}));
+
+jest.mock('@/components/auth', () => ({
+  AuthInitializer: () => <div data-testid="auth-initializer" />,
+}));
+
+// Mock TanStack Query
+jest.mock('@tanstack/react-query', () => ({
+  QueryClient: jest.fn().mockImplementation(() => ({})),
+  QueryClientProvider: ({ children }: { children: React.ReactNode }) => (
+    <div data-testid="query-provider">{children}</div>
+  ),
+}));
+
+describe('Providers', () => {
+  it('renders without crashing', () => {
+    render(
+      <Providers>
+        <div>Test Content</div>
+      </Providers>
+    );
+
+    expect(screen.getByText('Test Content')).toBeInTheDocument();
+  });
+
+  it('wraps children with ThemeProvider', () => {
+    render(
+      <Providers>
+        <div>Test Content</div>
+      </Providers>
+    );
+
+    expect(screen.getByTestId('theme-provider')).toBeInTheDocument();
+  });
+
+  it('wraps children with QueryClientProvider', () => {
+    render(
+      <Providers>
+        <div>Test Content</div>
+      </Providers>
+    );
+
+    expect(screen.getByTestId('query-provider')).toBeInTheDocument();
+  });
+
+  it('renders AuthInitializer', () => {
+    render(
+      <Providers>
+        <div>Test Content</div>
+      </Providers>
+    );
+
+    expect(screen.getByTestId('auth-initializer')).toBeInTheDocument();
+  });
+
+  it('renders children', () => {
+    render(
+      <Providers>
+        <div data-testid="test-child">Child Component</div>
+      </Providers>
+    );
+
+    expect(screen.getByTestId('test-child')).toBeInTheDocument();
+    expect(screen.getByText('Child Component')).toBeInTheDocument();
+  });
+});