Place advertisement in empty space on homepage

Add an AdSense ad unit to the homepage, occupying the previously empty space to the left of the featured articles.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 517dfa7b-26ac-463d-a6e1-a58c6df97188
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Event-Id: cfdd2f06-528d-46d0-b0d1-f6b38bcf03b8
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/f209e72a-0939-48fa-84fc-57854de71967/517dfa7b-26ac-463d-a6e1-a58c6df97188/nFw7xof
Replit-Helium-Checkpoint-Created: true

client/src/pages/home.tsx

@@ -570,7 +570,17 @@ export default function Home() {
         </div>
 
         {widePickedArticles.length > 0 && (
-          <div className="grid grid-cols-1 sm:grid-cols-2 gap-4 lg:ml-auto lg:w-3/4">
+          <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-4 gap-4">
+            <div className="hidden lg:block rounded-lg overflow-hidden bg-card border border-card-border">
+              <AdSense
+                slot="3854634730"
+                format="fluid"
+                layoutKey="-6r+cy-10+8a-3"
+                style={{ display: "block" }}
+                className="w-full h-full min-h-[250px]"
+              />
+            </div>
+            <div className="hidden lg:block" />
             {widePickedArticles.map((a) => (
               <WideCard key={`wide-top-${a.id}`} article={a} focalPoints={focalPoints} />
             ))}