refactor(DownloadAll): 调整按钮位置

src/tabs/MainTab.tsx

@@ -1,5 +1,6 @@
 import { RiErrorWarningLine } from 'react-icons/ri';
 import { SelectFile } from '../components/SelectFile';
+import { DownloadAll } from '~/components/DownloadAll.tsx';
 
 import { FileListing } from '~/features/file-listing/FileListing';
 import { useAppDispatch, useAppSelector } from '~/hooks.ts';
@@ -39,6 +40,7 @@ export function MainTab() {
         <div className="w-full mt-4">
           <FileListing />
         </div>
+        <DownloadAll />
       </div>
     </div>
   );