feat: Refactor utility and component exports, update dependencies, and add Knip for unused code detection.

frontend/src/asset_manager.ts

@@ -4,9 +4,9 @@ import type { DocumentVersion, Document } from './types/documents';
 
 type Nullable<T> = T | null;
 
-export type { Asset, DocumentVersion as DocumentVersionLike, Document };
+export type { Asset };
 
-export const resolveAssetExpiresAt = (asset?: { download?: { expires_at: number } | null } | null): number | null =>
+const resolveAssetExpiresAt = (asset?: { download?: { expires_at: number } | null } | null): number | null =>
   asset?.download?.expires_at ?? null;
 
 export const resolveAssetUrl = (asset?: { download?: { url: string } | null } | null): string | null =>
@@ -20,7 +20,7 @@ export type EnsureAssetUrl = (
 
 export type GetAsset = (document: Document, assetType: string) => Nullable<Asset>;
 
-export const getAssetFromGroup = (
+const getAssetFromGroup = (
   assets?: Asset[] | Record<string, Asset> | null,
   assetType: string = '',
 ): Nullable<Asset> => {