fix(redesign): ScrollReveal reduced-motion 시 transition까지 생략(정적 표시)

기존엔 스크롤 스태거만 건너뛰고 700ms 전환은 남았음 → instant 분기로 완전 정지.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01A2N6SziVSPfavx1j5rAs52

app/components/deepfield/ScrollReveal.tsx

@@ -14,10 +14,13 @@ interface Props {
 export default function ScrollReveal({ children, delay = 0, variant = 'fade-up', className }: Props) {
   const ref = useRef<HTMLDivElement>(null);
   const [shown, setShown] = useState(false);
+  // reduced-motion: transition까지 생략하고 정적으로 표시
+  const [instant, setInstant] = useState(false);
 
   useEffect(() => {
-    // reduced-motion: 즉시 표시 (연출 생략)
+    // reduced-motion: 즉시 표시 (연출·전환 생략)
     if (window.matchMedia('(prefers-reduced-motion: reduce)').matches) {
+      setInstant(true);
       setShown(true);
       return;
     }
@@ -46,6 +49,15 @@ export default function ScrollReveal({ children, delay = 0, variant = 'fade-up',
     variant === 'fade' ? 'opacity-100' :
     'opacity-100 translate-y-0';
 
+  // reduced-motion이면 transition/transform 없이 정적 표시
+  if (instant) {
+    return (
+      <div ref={ref} className={className}>
+        {children}
+      </div>
+    );
+  }
+
   return (
     <div
       ref={ref}