redesign(homepage): elegant editorial redesign with scroll animations

- HeroSection: full-viewport split layout with staggered entrance animations,
  editorial typography, tech stack tags, animated scroll indicator
- WorksSection: refined header with section label, scroll-reveal on entry
- ProjectCard: per-card IntersectionObserver reveal, numbered projects,
  enhanced hover states (scale + brightness), improved CTA
- FeatureSection: card grid with border/glass treatment and staggered reveals
- AboutSection: animated timeline progress line, scroll-triggered card entrances
- FeatureColumn: icon container with hover treatment
- globals.css: fadeUp/lineGrow/arrowBounce keyframes, .reveal utility,
  prefers-reduced-motion support, brand-accent color token
- lib/useReveal.ts: IntersectionObserver hook for scroll reveals

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

app/[locale]/globals.css

@@ -3,11 +3,60 @@
 @theme {
   --color-brand-brown: #2C1E16;
   --color-brand-beige: #F5F4F0;
-  
-  --font-sans: var(--font-inter); 
+  --color-brand-accent: #8B7355;
+
+  --font-sans: var(--font-inter);
   --font-serif: var(--font-playfair);
 }
 
+@keyframes fadeUp {
+  from { opacity: 0; transform: translateY(28px); }
+  to   { opacity: 1; transform: translateY(0); }
+}
+
+@keyframes fadeIn {
+  from { opacity: 0; }
+  to   { opacity: 1; }
+}
+
+@keyframes lineGrow {
+  from { width: 0%; }
+  to   { width: 95%; }
+}
+
+@keyframes arrowBounce {
+  0%, 100% { transform: translateY(0); }
+  50%       { transform: translateY(6px); }
+}
+
+@keyframes underlineSlide {
+  from { transform: scaleX(0); }
+  to   { transform: scaleX(1); }
+}
+
+.reveal {
+  opacity: 0;
+  transform: translateY(28px);
+  transition: opacity 700ms cubic-bezier(0.22, 1, 0.36, 1),
+              transform 700ms cubic-bezier(0.22, 1, 0.36, 1);
+}
+
+.reveal.visible {
+  opacity: 1;
+  transform: translateY(0);
+}
+
+@media (prefers-reduced-motion: reduce) {
+  .reveal {
+    opacity: 1;
+    transform: none;
+    transition: none;
+  }
+  .animate-arrow-bounce {
+    animation: none !important;
+  }
+}
+
 :root {
   --background: #ffffff;
   --foreground: #171717;