Refactor multiline formatting, link definitions, and code consistency across components and tests

- Improved readability by updating multiline statements and object definitions.
- Applied consistent link and button wrapping in `DemoSection` and other components.
- Enhanced test assertions and helper functions with uniform formatting and parentheses usage.

frontend/tests/app/page.test.tsx

@@ -264,10 +264,10 @@ describe('HomePage', () => {
       const tryDemoButtons = screen.getAllByRole('button', { name: /try demo/i });
       fireEvent.click(tryDemoButtons[0]);
       expect(screen.getByTestId('demo-modal')).toBeInTheDocument();
-      
+
       // Close the modal
       const closeButtons = screen.getAllByRole('button', { name: /close/i });
-      const modalCloseButton = closeButtons.find(btn => btn.textContent === 'Close');
+      const modalCloseButton = closeButtons.find((btn) => btn.textContent === 'Close');
       if (modalCloseButton) {
         fireEvent.click(modalCloseButton);
       }