style(blog): reduce hero image overlays for better visibility

app/[locale]/blog/[slug]/page.tsx

@@ -88,7 +88,7 @@ export default async function BlogPost({ params }: BlogPostProps) {
               }}
             />
           </div>
-          <div className="absolute inset-0 bg-gradient-to-t from-neutral-dark via-neutral-dark/40 to-transparent" />
+          <div className="absolute inset-0 bg-gradient-to-t from-neutral-dark/90 via-neutral-dark/40 to-transparent" />
 
           {/* Title overlay on image */}
           <div className="absolute inset-0 flex flex-col justify-end pb-16 md:pb-24">