feat: cinematic landing page with 3D title, scroll easter egg, and starfield preservation

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

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

fix: rename @keyframes pulse to pulse-fast to avoid Tailwind v4 collision, add pointer-events:none to .star

feat: install lucide-react + canvas-confetti, add nebula CSS foundation

feat: scaffold Next.js 15 + Tailwind v4 + Vitest + Supabase deps