perf: use responsive next/image for mdx images

app/[locale]/page.tsx

@@ -4,8 +4,8 @@ import { notFound } from 'next/navigation';
 import { getMdxContent } from '@/lib/mdx';
 import { MDXRemote } from 'next-mdx-remote/rsc';
 
-
 import nextDynamic from 'next/dynamic';
+import { getImageProps } from 'next/image';
 
 import { HeroVideo as HomeHero } from '@/components/blocks/HeroVideo';
 const HomeSubCompanyTiles = nextDynamic(() => import('@/components/blocks/SubCompanyTiles').then(mod => mod.SubCompanyTiles));
@@ -38,8 +38,40 @@ const mdxComponents = (references: any[]) => ({
   InteractiveGermanyMap,
   ScaleOfImpact,
   img: (props: any) => {
-    // We proxy it through Next.js image optimizer
-    return <img {...props} src={`/_next/image?url=${encodeURIComponent(props.src)}&w=1920&q=75`} loading="lazy" decoding="async" />;
+    // Parse src if it's already a next image proxy
+    let src = props.src;
+    if (typeof src === 'string' && src.startsWith('/_next/image')) {
+      try {
+        const urlParam = new URLSearchParams(src.split('?')[1]).get('url');
+        if (urlParam) src = decodeURIComponent(urlParam);
+      } catch (e) {
+        // Fallback
+      }
+    }
+    
+    // Use Next.js getImageProps for responsive srcSet generation
+    const {
+      props: { srcSet, src: finalSrc, sizes }
+    } = getImageProps({
+      src,
+      alt: props.alt || '',
+      width: 1920,
+      height: 1080,
+      sizes: '(max-width: 768px) 100vw, (max-width: 1200px) 75vw, 50vw',
+      quality: 80,
+    });
+
+    return (
+      <img 
+        {...props} 
+        src={finalSrc} 
+        srcSet={srcSet}
+        sizes={sizes}
+        loading="lazy" 
+        decoding="async" 
+        style={{ width: '100%', height: 'auto', ...props.style }}
+      />
+    );
   }
 });