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/ui/SectionHeading.tsx

@@ -13,7 +13,7 @@ export function SectionHeading({ children, className = "", centered = false }: S
         {children}
       </h2>
       <span
-        className={`mt-4 block h-[1px] w-20 bg-gradient-to-r from-[#c9a96e] to-transparent ${
+        className={`mt-4 block h-[1px] w-20 bg-gradient-to-r from-gold to-transparent ${
           centered ? "mx-auto" : ""
         }`}
       />