refactor

frontend/src/hooks/documents/useDocumentCorrespondentActions.ts

@@ -1,4 +1,5 @@
 import { useCallback, useMemo } from 'react';
+import { isPlainObject, isStringValue } from '../../utils/typeGuards';
 
 type ApiClient = {
   post: (path: string, body?: unknown) => Promise<{ data: unknown }>;
@@ -99,10 +100,10 @@ const useDocumentCorrespondentActions = ({
     if (!option) {
       return null;
     }
-    if (typeof option === 'object' && 'id' in option) {
+    if (isPlainObject(option) && 'id' in option) {
       return option as CorrespondentOption;
     }
-    if (typeof option === 'string') {
+    if (isStringValue(option)) {
       const trimmed = option.trim();
       if (trimmed) {
         return { id: null, name: trimmed };