Harden gameplay timing and map loading

app/servers/[id]/page.tsx

@@ -10,12 +10,8 @@ export default async function ServerPage({
   params: Promise<{ id: string }>;
 }) {
   const { id } = await params;
-  let map;
-  try {
-    map = await getMap(id);
-  } catch {
-    notFound();
-  }
+  const map = await getMap(id);
+  if (!map) notFound();
   return (
     <>
       <Header />
@@ -34,7 +30,7 @@ export default async function ServerPage({
           <div>
             <div className="detail-map">
               <Image
-                src={map.mapImage || map.image || ""}
+                src={map.mapImage || map.image || "/images/example-map.webp"}
                 alt={`${map.name} surface map`}
                 width={1024}
                 height={1024}