feat(F-193): completed feature

project/frontend/src/app/products/[slug]/page.tsx

@@ -151,6 +151,19 @@ export default async function ProductPage({ params }: Props) {
               <div className="mt-2 text-sm text-gray-500">
                 {formatPrice(netCents)} sin IVA ({vatPercent}%)
               </div>
+              {/* F-193: expiry and weight */}
+              {(product as { expirationDate?: string }).expirationDate && (
+                <div className="mt-1 text-sm text-gray-400">
+                  Caduca: {new Date((product as { expirationDate: string }).expirationDate).toLocaleDateString('es-ES')}
+                </div>
+              )}
+              {primaryVariant?.weightGrams && (
+                <div className="mt-1 text-sm text-gray-400">
+                  Peso: {primaryVariant.weightGrams >= 1000
+                    ? `${(primaryVariant.weightGrams / 1000).toFixed(2)} kg`
+                    : `${primaryVariant.weightGrams} g`}
+                </div>
+              )}
             </div>
           ) : (
             <div className="mt-6 bg-gray-50 rounded-xl p-6">