refactor: Consolidate workspace utilities into new workspaceUtils.ts with typed entry keys, replacing appLayoutUtils.ts, and update related components.

frontend/src/hooks/documents/useFolderTree.ts

@@ -8,7 +8,7 @@ import {
   isFolderRowKey,
   resolveDocumentRowKey,
   resolveFolderRowKey,
-} from '../../app/appLayoutUtils';
+} from '../../app/workspaceUtils';
 
 type Identifier = string | number;
 type FolderId = Identifier | 'root';