Update ad format to thinner, horizontal display

Adjust InArticleAd component in adsense.tsx to use a horizontal format with a fixed height of 90px, replacing the previous fluid layout.

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client/src/components/adsense.tsx

@@ -96,13 +96,13 @@ export function ArticleCardAd() {
 
 export function InArticleAd() {
   return (
-    <div className="my-8 py-4 border-y border-border/30">
-      <div className="text-[10px] text-muted-foreground/40 text-center mb-2 uppercase tracking-widest">Anzeige</div>
+    <div className="my-6 rounded-md overflow-hidden bg-card border border-card-border">
+      <div className="text-[9px] text-muted-foreground/40 text-center pt-1 uppercase tracking-widest">Anzeige</div>
       <AdSense
         slot="4154017639"
-        format="fluid"
-        layout="in-article"
-        style={{ display: "block", textAlign: "center" }}
+        format="horizontal"
+        style={{ display: "block", width: "100%", height: "90px" }}
+        responsive={false}
       />
     </div>
   );