Use game cover as series cover if series cover is not available

src/components/games/GamesView.tsx

@@ -304,6 +304,7 @@ function SeriesCard({ series, onClick }: { series: GameSeries; onClick: () => vo
   const seriesPlatforms: GamePlatform[] = [
     ...new Set(series.games.flatMap((g) => g.platforms)),
   ]
+  const resolvedCover = series.coverUrl ?? series.games[0]?.coverUrl ?? null
 
   return (
     <button
@@ -320,9 +321,9 @@ function SeriesCard({ series, onClick }: { series: GameSeries; onClick: () => vo
       }}
     >
       <div className="aspect-[3/4] w-full relative overflow-hidden" style={{ backgroundColor: 'var(--border)' }}>
-        {series.coverUrl ? (
+        {resolvedCover ? (
           // eslint-disable-next-line @next/next/no-img-element
-          <img src={series.coverUrl} alt={series.title} className="absolute inset-0 w-full h-full object-cover" />
+          <img src={resolvedCover} alt={series.title} className="absolute inset-0 w-full h-full object-cover" />
         ) : (
           <div className="absolute inset-0 flex items-center justify-center text-4xl">🎮</div>
         )}