fix: replace post title in cover image alt text with generic description

app/posts/[slug]/page.tsx

@@ -57,7 +57,7 @@ export default async function PostPage({ params }: { params: Promise<{ slug: str
               {post.coverImage && (
                 <img
                   src={post.coverImage}
-                  alt={post.title}
+                  alt="Cover image"
                   className="w-full h-64 object-cover rounded-xl my-6"
                   loading="lazy"
                 />

components/blog/PostCard.tsx

@@ -18,7 +18,7 @@ export function PostCard({ slug, title, date, excerpt, tags = [], author, readin
           <div className="mb-4 overflow-hidden rounded-lg">
             <img
               src={coverImage}
-              alt={title}
+              alt="Cover image"
               className="w-full h-40 object-cover"
               loading="lazy"
             />