refactor: centralize gold tokens, extract sub-components, clean up unused code

- Replace hardcoded hex colors with gold/gold-light/gold-dark Tailwind tokens
- Extract Schedule into DayCard, ScheduleFilters, MobileSchedule sub-components
- Extract Team into TeamCarousel, TeamMemberInfo sub-components
- Add UI_CONFIG for centralized magic numbers (timings, thresholds)
- Add reusable IconBadge component, simplify Contact section
- Convert Pricing clickable divs to semantic buttons for a11y
- Remove unused SocialLinks, btn-outline, btn-ghost, nav-link CSS classes
- Fix React setState-during-render error in TeamCarousel (deferred update pattern)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/sections/Hero.tsx

@@ -73,7 +73,7 @@ export function Hero() {
       <div className="hero-cta absolute bottom-8 left-1/2 -translate-x-1/2">
         <a
           href="#about"
-          className="flex flex-col items-center gap-1 text-neutral-600 transition-colors hover:text-[#d4b87a]"
+          className="flex flex-col items-center gap-1 text-neutral-600 transition-colors hover:text-gold-light"
         >
           <span className="text-xs uppercase tracking-widest">Scroll</span>
           <ChevronDown size={20} className="animate-bounce" />