feat: implement accessibility improvements by ensuring alt text is always present on image error events and initialize accessibility checking in App component

src/components/ProductImage.js

@@ -33,6 +33,12 @@ const ProductImage = ({
           alt={product.name}
           fetchPriority="high"
           loading="eager"
+          onError={(e) => {
+            // Ensure alt text is always present even on error
+            if (!e.target.alt) {
+              e.target.alt = product.name || 'Produktbild';
+            }
+          }}
           sx={{ objectFit: "cover" }}
         />
       )}