Ajoute une image de couverture sur les cards de jeu

- Champ `cover` dans lib/games.ts
- Branché sur la card home, la liste des jeux et le hero page projet
- Fallback placeholder logo si pas d'image

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/page.tsx

@@ -3,6 +3,9 @@
 import Image from "next/image";
 import Link from "next/link";
 import { motion } from "framer-motion";
+import { games } from "@/lib/games";
+
+const featured = games[0];
 
 // Screenshots WIP du projet.
 // Pour en ajouter : dépose l'image dans /public/image/Emberwild/
@@ -190,15 +193,25 @@ export default function Home() {
               href="/games/emberwild"
               className="group relative aspect-[16/9] bg-surface border border-border overflow-hidden block hover:border-accent transition-colors duration-500"
             >
-              <div className="absolute inset-0 flex items-center justify-center">
+              {featured?.cover ? (
                 <Image
-                  src="/image/Studio/Logo Flat.png"
-                  alt="Game placeholder"
-                  width={120}
-                  height={80}
-                  className="opacity-20 group-hover:opacity-30 group-hover:scale-105 transition-all duration-700 ease-out"
+                  src={featured.cover}
+                  alt={featured.title}
+                  fill
+                  sizes="(max-width: 1152px) 100vw, 1152px"
+                  className="object-cover group-hover:scale-105 transition-transform duration-700 ease-out"
                 />
-              </div>
+              ) : (
+                <div className="absolute inset-0 flex items-center justify-center">
+                  <Image
+                    src="/image/Studio/Logo Flat.png"
+                    alt="Game placeholder"
+                    width={120}
+                    height={80}
+                    className="opacity-20 group-hover:opacity-30 group-hover:scale-105 transition-all duration-700 ease-out"
+                  />
+                </div>
+              )}
               <div
                 aria-hidden
                 className="absolute inset-0 bg-accent/0 group-hover:bg-accent/[0.03] transition-colors duration-500"