refactor: convert download manager into a state class (#17491)

* fix(web): download progress bar not functioning

* remove unused method

web/src/routes/admin/repair/+page.svelte

@@ -7,7 +7,7 @@
     NotificationType,
     notificationController,
   } from '$lib/components/shared-components/notification/notification';
-  import { downloadManager } from '$lib/stores/download';
+  import { downloadManager } from '$lib/stores/download-store.svelte';
   import { locale } from '$lib/stores/preferences.store';
   import { copyToClipboard } from '$lib/utils';
   import { downloadBlob } from '$lib/utils/asset-utils';