fix: bpm timing

src/lib/components/ui/background/background.svelte

@@ -1,12 +1,15 @@
 <script lang="ts">
   import background from "../../../../assets/background.gif";
+
+  const prop: {beatmapId: number} = $props();
+
 </script>
 
 <div
   class="absolute w-screen h-screen overflow-hidden pointer-events-none rounded"
 >
   <div
-    style="background: url(https://osu.direct/api/media/background/2226722)"
+    style="background: url(https://osu.direct/api/media/background/{prop.beatmapId})"
     class="absolute top-0 left-0 w-full h-full !bg-cover -z-10 pointer-events-none blur opacity-10 rounded"
   ></div>
 </div>