feat: Improve mobile responsiveness for tracing beam and footer
- Hide tracing beam visual elements on mobile screens (< 768px)
- Hide complex SIM card SVG footer on mobile devices
- Update footer layout to stack vertically on mobile
- Maintain all essential content and functionality on small screens
- Social links and copyright remain accessible with centered alignment
This creates a cleaner, more focused mobile experience while preserving the sophisticated visual effects for desktop users.