feat: update design elements, add AUX brand logo support and rename blog image

components/sections/BlogPreview.tsx

@@ -1,7 +1,7 @@
 import Link from "next/link";
+import Image from "next/image";
 import { ArrowRight, Calendar, User } from "lucide-react";
 import { SectionHeading } from "../common/SectionHeading";
-import { Placeholder } from "../common/Placeholder";
 import { getLatestPosts } from "@/content/posts";
 
 export function BlogPreview() {
@@ -44,10 +44,13 @@ export function BlogPreview() {
             >
               <div>
                 {/* Thumbnail */}
-                <div className="bg-slate-50 border-b border-border">
-                  <Placeholder
-                    text={`Miniatura artykułu: ${post.title}`}
-                    aspect="video"
+                <div className="relative aspect-video bg-slate-50 border-b border-border">
+                  <Image
+                    src={post.image}
+                    alt={post.title}
+                    fill
+                    className="object-cover"
+                    sizes="(max-width: 768px) 100vw, 33vw"
                   />
                 </div>