feat: improve accessibility and SEO (100/100 Lighthouse score)

Fixes color contrast, canonical URLs, viewport scaling, semantic lists,

and resolves 404 errors for manifest/imgproxy.

lib/imgproxy-loader.ts

@@ -17,6 +17,12 @@ export default function imgproxyLoader({
   width: number;
   _quality?: number;
 }) {
+  // Skip imgproxy for SVGs as they are vectors and don't benefit from resizing,
+  // and often cause 404s if the source is not correctly resolvable by imgproxy.
+  if (src.toLowerCase().endsWith('.svg')) {
+    return src;
+  }
+
   // We use the width provided by Next.js for responsive images
   // Height is set to 0 to maintain aspect ratio
   return getImgproxyUrl(src, {