fix: resolve all type errors from spectrum redesign

feat: apply equipped cosmetics to UI components via CSS custom properties

feat: separate Triviaverse and Nebula Arcade sections on home page

feat: upgrade GlassCard to use glass-card CSS class and add glow prop, add glow classes to Button variants

fix: move star data to module-level constant, use Tailwind blur classes, add reduced-motion

feat: add starfield background and decorative gradient blobs to root layout

feat: polish — page transitions, sound integration, screen shake, remaining files