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/About.tsx

@@ -36,9 +36,9 @@ export function About() {
             {stats.map((stat, i) => (
               <div
                 key={i}
-                className="group flex flex-col items-center gap-3 rounded-2xl border border-neutral-200 bg-white/50 p-6 transition-all duration-300 hover:border-[#c9a96e]/30 sm:p-8 dark:border-white/[0.06] dark:bg-white/[0.02] dark:hover:border-[#c9a96e]/20"
+                className="group flex flex-col items-center gap-3 rounded-2xl border border-neutral-200 bg-white/50 p-6 transition-all duration-300 hover:border-gold/30 sm:p-8 dark:border-white/[0.06] dark:bg-white/[0.02] dark:hover:border-gold/20"
               >
-                <div className="flex h-11 w-11 items-center justify-center rounded-xl bg-[#c9a96e]/10 text-[#a08050] transition-colors group-hover:bg-[#c9a96e]/20 dark:text-[#d4b87a]">
+                <div className="flex h-11 w-11 items-center justify-center rounded-xl bg-gold/10 text-gold-dark transition-colors group-hover:bg-gold/20 dark:text-gold-light">
                   {stat.icon}
                 </div>
                 <span className="font-display text-3xl font-bold text-neutral-900 sm:text-4xl dark:text-white">