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

frontend/src/lib/apiClient.ts

@@ -342,15 +342,4 @@ api.interceptors.response.use(
   },
 );
 
-export type {
-  DownloadLink,
-  DocumentResponse,
-  AssetResponse,
-  FolderTreeNode,
-  CapabilitySetResponse,
-  CapabilityResponse,
-  ApiTokenRecord,
-  PasskeySummary,
-  Identifier,
-  TenantSnippet,
-} from './apiTypes';
+export type { ApiTokenRecord } from './apiTypes';

frontend/src/lib/apiTypes.ts

@@ -14,7 +14,7 @@ export interface TagResponse {
   color?: string | null;
 }
 
-export interface CorrespondentResponse {
+interface CorrespondentResponse {
   id: string;
   name: string;
   metadata: Record<string, unknown>;
@@ -29,7 +29,7 @@ export interface AssetResponse {
   [key: string]: unknown;
 }
 
-export interface DocumentVersionResponse {
+interface DocumentVersionResponse {
   id: string;
   version_number: number;
   size_bytes: number;
@@ -57,7 +57,7 @@ export interface DocumentResponse {
   current_version?: DocumentVersionResponse | null;
 }
 
-export interface FolderInfo {
+interface FolderInfo {
   id: string;
   name: string;
   parent_id?: string | null;