FullscreenDiv 컴포넌트 추가 및 TopBar 컴포넌트 리팩토링

src/routes/(fullscreen)/file/downloads/+page.svelte

@@ -1,6 +1,7 @@
 <script lang="ts">
   import { get } from "svelte/store";
-  import { TopBar } from "$lib/components";
+  import { FullscreenDiv } from "$lib/components/atoms";
+  import { TopBar } from "$lib/components/molecules";
   import { fileDownloadStatusStore, isFileDownloading } from "$lib/stores";
   import File from "./File.svelte";
 
@@ -19,11 +20,11 @@
   <title>진행 중인 다운로드</title>
 </svelte:head>
 
-<div class="flex flex-col">
-  <TopBar />
+<TopBar />
+<FullscreenDiv>
   <div class="space-y-2 pb-4">
     {#each downloadingFiles as status}
       <File {status} />
     {/each}
   </div>
-</div>
+</FullscreenDiv>