Mobile-First UX Optimization Build touch-optimized, performant mobile experiences with proper viewport handling and responsive patterns. When to Use ✅ USE this skill for: - Viewport issues ( problems, safe areas, notches) - Touch target sizing and spacing - Mobile navigation patterns (bottom nav, drawers, hamburger menus) - Swipe gestures and pull-to-refresh - Responsive breakpoint strategies - Mobile performance optimization ❌ DO NOT use for: - Native app development → use or skills - Desktop-only features → no skill needed, standard patterns apply - General CSS/Tailwind questions → use Tail…