feat: implement header/footer visibility controls for checkout and thankyou pages

- Created LayoutWrapper component to conditionally render header/footer based on route
- Created MinimalHeader component (logo only)
- Created MinimalFooter component (trust badges + policy links)
- Created usePageVisibility hook to get visibility settings per page
- Wrapped ClassicLayout with LayoutWrapper for conditional rendering
- Header/footer visibility now controlled directly in React SPA
- Settings: show/minimal/hide for both header and footer
- Background color support for checkout and thankyou pages

customer-spa/src/main.tsx

@@ -1,6 +1,7 @@
 import React from 'react';
 import { createRoot } from 'react-dom/client';
 import './index.css';
+import './styles/fonts.css';
 import './styles/theme.css';
 import App from './App';