fix: replace missing `fetchSpaceRandomly` with `fetchFilteredSpaces` in `getSpace` function

app/actions.ts

@@ -1,8 +1,8 @@
 "use server"
 
-import { fetchSpaceRandomly } from "@/utils/network"
+import { fetchFilteredSpaces } from "@/utils/network";
 
 export const getSpace = async () => {
-  const space = await fetchFilteredSpaces('gpu', '');
-  return space;
+  const spaces = await fetchFilteredSpaces('gpu', '');
+  return spaces.length > 0 ? spaces[0] : null;
 }