refactor: mark dead exports with TODO, deduplicate field sanitization, fix import placement

src/lib/api-response.ts

@@ -30,7 +30,7 @@ export function apiValidationError(zodError: z.ZodError) {
 	);
 }
 
-/** Centralized error handler for API routes */
+// TODO: Check of dit weg kan — niet geïmporteerd in de codebase
 export function handleApiError(error: unknown): Response {
 	if (error instanceof ApiError) {
 		return apiError(error.message, error.status);