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

frontend/src/folders/FolderManagerContext.tsx

@@ -3,7 +3,7 @@ import { DEFAULT_FOLDER_NAME } from '../app/workspaceUtils';
 
 type FolderId = string | null;
 
-export interface FolderManager {
+interface FolderManager {
   getNameSync: (folderId: FolderId) => string | null;
   resolveName: (folderId: FolderId) => Promise<string>;
 }
@@ -55,5 +55,3 @@ export const FolderManagerProvider: React.FC<FolderManagerProviderProps> = ({
 };
 
 export const useFolderManager = (): FolderManager => useContext(FolderManagerContext);
-
-export default FolderManagerContext;