Settings Page:
- Horizontal scrollable tabs on mobile (< lg breakpoint)
- Vertical sidebar on desktop (lg+)
- Hide plan info card on mobile (visible in billing tab)
Header:
- Added Settings link in mobile menu for authenticated users
Global CSS:
- Added scrollbar-hide utility class
- Added smooth scrolling for touch devices
- Added touch-pan-x for horizontal scroll areas
- Removed tap highlight on mobile
- select-none utility class
