perf: optimize Lighthouse scores to 100

Performance:
- Lazy-load ShaderGradientBackground via dynamic import (reduces initial JS ~250KB)
- Disable ShaderGradient animations (animate=off) to reduce CPU/GPU load
- Remove opacity:0 animations from Hero LCP elements for instant paint
- Add browserslist targeting modern browsers (eliminates ~13KB polyfills)

Accessibility:
- Fix color contrast: text-stone-400 → text-stone-600 dark:text-stone-400 on light backgrounds
- Fix text-liquid-mint → text-emerald-700/600 for readable text/accent dots
- Fix quote text contrast on dark status box (text-stone-700 → text-stone-300)
- Fix Online badge contrast (emerald-600 → emerald-700)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

app/components/ShaderGradientBackground.tsx

@@ -0,0 +1,112 @@
+"use client";
+
+import React from "react";
+import { ShaderGradientCanvas, ShaderGradient } from "@shadergradient/react";
+
+const ShaderGradientBackground = () => {
+  return (
+    <div
+      style={{
+        position: "fixed",
+        top: 0,
+        left: 0,
+        width: "100%",
+        height: "100%",
+        zIndex: -1,
+        filter: "blur(150px)",
+        opacity: 0.65,
+        pointerEvents: "none",
+      }}
+    >
+      <ShaderGradientCanvas
+        style={{
+          position: "absolute",
+          top: 0,
+          left: 0,
+          width: "100%",
+          height: "100%",
+        }}
+      >
+        {/* Sphere 1 - Links oben */}
+        <ShaderGradient
+          control="props"
+          type="sphere"
+          animate="off"
+          brightness={1.3}
+          cAzimuthAngle={180}
+          cDistance={3.6}
+          cPolarAngle={90}
+          cameraZoom={1}
+          color1="#b01040"
+          color2="#b04a17"
+          color3="#e167c5"
+          positionX={-2.5}
+          positionY={1.5}
+          positionZ={0}
+          rotationX={0}
+          rotationY={15}
+          rotationZ={50}
+          uAmplitude={6.0}
+          uDensity={0.8}
+          uFrequency={5.5}
+          uSpeed={0.5}
+          uStrength={5.0}
+        />
+        
+        {/* Sphere 2 - Rechts mitte */}
+        <ShaderGradient
+          control="props"
+          type="sphere"
+          animate="off"
+          brightness={1.25}
+          cAzimuthAngle={180}
+          cDistance={3.6}
+          cPolarAngle={90}
+          cameraZoom={1}
+          color1="#e167c5"
+          color2="#b01040"
+          color3="#b04a17"
+          positionX={2.0}
+          positionY={-0.5}
+          positionZ={-0.5}
+          rotationX={0}
+          rotationY={25}
+          rotationZ={70}
+          uAmplitude={5.5}
+          uDensity={0.9}
+          uFrequency={4.8}
+          uSpeed={0.45}
+          uStrength={4.8}
+        />
+        
+        {/* Sphere 3 - Unten links */}
+        <ShaderGradient
+          control="props"
+          type="sphere"
+          animate="off"
+          brightness={1.2}
+          cAzimuthAngle={180}
+          cDistance={3.6}
+          cPolarAngle={90}
+          cameraZoom={1}
+          color1="#b04a17"
+          color2="#e167c5"
+          color3="#b01040"
+          positionX={-0.5}
+          positionY={-2.0}
+          positionZ={0.3}
+          rotationX={0}
+          rotationY={20}
+          rotationZ={60}
+          uAmplitude={5.8}
+          uDensity={0.7}
+          uFrequency={6.0}
+          uSpeed={0.52}
+          uStrength={4.9}
+        />
+      </ShaderGradientCanvas>
+    </div>
+  );
+};
+
+export default ShaderGradientBackground;