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>

lib/useReveal.ts

@@ -0,0 +1,29 @@
+'use client';
+
+import { useEffect, useRef } from 'react';
+
+export function useReveal(threshold = 0.15) {
+    const ref = useRef<HTMLElement>(null);
+
+    useEffect(() => {
+        const el = ref.current;
+        if (!el) return;
+
+        const observer = new IntersectionObserver(
+            ([entry]) => {
+                if (entry.isIntersecting) {
+                    el.querySelectorAll('.reveal').forEach((node) => {
+                        node.classList.add('visible');
+                    });
+                    observer.unobserve(el);
+                }
+            },
+            { threshold }
+        );
+
+        observer.observe(el);
+        return () => observer.disconnect();
+    }, [threshold]);
+
+    return ref;
+}