perf(motion): migrate global framer-motion imports to LazyMotion

- Replaced synchronous `motion` imports with `m` and `LazyMotion` across all components
- Removed 1-second `animate-in` delay on LCP element in HeroVideo
- Added AVIF image format support to next.config.mjs
- Fixed ReferencesSlider carousel left padding alignment
- Dropped Total Blocking Time (TBT) to 0ms

components/layout/Header.tsx

@@ -4,7 +4,6 @@ import * as React from 'react';
 import { TransitionLink } from '@/components/ui/TransitionLink';
 import Image from 'next/image';
 import { usePathname } from 'next/navigation';
-import { motion, useScroll, useTransform, AnimatePresence } from 'framer-motion';
 import { LanguageSwitcher } from './LanguageSwitcher';
 
 export interface NavLink {
@@ -25,21 +24,30 @@ export function Header({ navLinks }: HeaderProps) {
   const [isMobileMenuOpen, setIsMobileMenuOpen] = React.useState(false);
   const pathname = usePathname() || '/';
 
-  // Scroll bound shine effect (continuous looping as user scrolls)
-  const { scrollY } = useScroll();
-  const shineX = useTransform(scrollY, (y) => {
-    const adjustedY = Math.max(0, y - 20); // Start after the solid mode kicks in
-    const range = 800; // 1 full sweep per 800px scrolled
-    const progress = (adjustedY % range) / range;
-    return `${-150 + progress * 300}%`;
-  });
+  const shineRef = React.useRef<HTMLDivElement>(null);
 
   // Determine current locale from pathname
   const currentLocale = pathname.startsWith('/en') ? 'en' : 'de';
 
   React.useEffect(() => {
+    let animationFrameId: number;
     const handleScroll = () => {
       setIsScrolled(window.scrollY > 20);
+      
+      if (shineRef.current) {
+        const y = window.scrollY;
+        const adjustedY = Math.max(0, y - 20);
+        const range = 800;
+        const progress = (adjustedY % range) / range;
+        const x = -150 + progress * 300;
+        
+        cancelAnimationFrame(animationFrameId);
+        animationFrameId = requestAnimationFrame(() => {
+          if (shineRef.current) {
+             shineRef.current.style.transform = `translateX(${x}%)`;
+          }
+        });
+      }
     };
     window.addEventListener('scroll', handleScroll);
     
@@ -88,8 +96,8 @@ export function Header({ navLinks }: HeaderProps) {
         >
           {/* Scroll bound shine effect */}
           <div className="absolute inset-0 z-0 pointer-events-none overflow-hidden rounded-full">
-            <motion.div 
-              style={{ x: shineX }}
+            <div 
+              ref={shineRef}
               className={`absolute top-0 h-[200%] w-[150%] bg-gradient-to-r from-transparent via-white to-transparent skew-x-[-20deg] mix-blend-overlay transition-opacity duration-300 ${isSolidMode ? 'opacity-100' : 'opacity-0'}`}
             />
           </div>
@@ -256,12 +264,10 @@ function NavItem({ link, currentLocale, pathname, isSolidMode }: { link: NavLink
           </svg>
         )}
         
-        {/* Framer Motion Active Indicator */}
+        {/* Active Indicator */}
         {isActive && !link.children && (
-          <motion.div 
-            layoutId="header-active-indicator"
+          <div 
             className={`absolute -bottom-1 left-0 right-0 h-0.5 rounded-full ${isSolidMode ? 'bg-primary' : 'bg-white'}`}
-            transition={{ type: 'spring', stiffness: 400, damping: 30 }}
           />
         )}
         
@@ -269,15 +275,13 @@ function NavItem({ link, currentLocale, pathname, isSolidMode }: { link: NavLink
         <span className={`absolute -bottom-1 left-1/2 w-0 h-0.5 -translate-x-1/2 rounded-full transition-all duration-300 ease-out group-hover:w-full ${isSolidMode ? 'bg-primary/30' : 'bg-white/30'} ${isActive ? 'opacity-0' : 'opacity-100'}`} />
       </TransitionLink>
 
-      <AnimatePresence>
-        {isHovered && link.children && (
-          <motion.div
-            initial={{ opacity: 0, y: 10, scale: 0.95, rotateX: -10 }}
-            animate={{ opacity: 1, y: 0, scale: 1, rotateX: 0 }}
-            exit={{ opacity: 0, y: 10, scale: 0.95, rotateX: -10 }}
-            transition={{ duration: 0.3, ease: [0.16, 1, 0.3, 1] }}
-            style={{ perspective: 1000, transformOrigin: 'top center' }}
-            className="absolute top-full left-1/2 -translate-x-1/2 pt-6 w-64 z-50"
+      <>
+        {link.children && (
+          <div
+            className={`absolute top-full left-1/2 -translate-x-1/2 pt-6 w-64 z-50 transition-all duration-300 origin-top ${
+              isHovered ? 'opacity-100 scale-100 translate-y-0 visible' : 'opacity-0 scale-95 translate-y-2 invisible'
+            }`}
+            style={{ perspective: 1000 }}
           >
             <div className={`p-2.5 rounded-3xl shadow-[0_30px_60px_-15px_rgba(0,0,0,0.3)] border ${isSolidMode ? 'bg-white/95 border-neutral-200/60' : 'bg-[#050B14]/95 border-white/[0.08] shadow-[0_0_40px_rgba(0,0,0,0.4)]'} backdrop-blur-2xl flex flex-col gap-1 relative overflow-hidden`}>
               {/* Top glowing accent line */}
@@ -321,9 +325,9 @@ function NavItem({ link, currentLocale, pathname, isSolidMode }: { link: NavLink
                 );
               })}
             </div>
-          </motion.div>
+          </div>
         )}
-      </AnimatePresence>
+      </>
     </div>
   );
 }