feat: fetchWrapper 마이그레이션 및 토큰 리프레시 캐싱 구현

- 40+ actions.ts 파일을 fetchWrapper 패턴으로 마이그레이션
- 토큰 리프레시 캐싱 로직 추가 (refresh-token.ts)
- ApiErrorContext 추가로 전역 에러 처리 개선
- HR EmployeeForm 컴포넌트 개선
- 참조함(ReferenceBox) 기능 수정
- juil 테스트 URL 페이지 추가
- claudedocs 문서 업데이트

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/components/settings/LeavePolicyManagement/actions.ts

@@ -1,21 +1,8 @@
 'use server';
 
-import { cookies } from 'next/headers';
+import { serverFetch } from '@/lib/api/fetch-wrapper';
 import type { LeavePolicySettings } from './types';
 
-// ===== API 헤더 생성 =====
-async function getApiHeaders(): Promise<HeadersInit> {
-  const cookieStore = await cookies();
-  const token = cookieStore.get('access_token')?.value;
-
-  return {
-    'Accept': 'application/json',
-    'Content-Type': 'application/json',
-    'Authorization': token ? `Bearer ${token}` : '',
-    'X-API-KEY': process.env.API_KEY || '',
-  };
-}
-
 // ===== API 응답 타입 =====
 interface LeavePolicyApi {
   id: number;
@@ -70,22 +57,29 @@ export async function getLeavePolicy(): Promise<{
   success: boolean;
   data?: LeavePolicySettings;
   error?: string;
+  __authError?: boolean;
 }> {
   try {
-    const headers = await getApiHeaders();
     const url = `${process.env.NEXT_PUBLIC_API_URL}/api/v1/leave-policy`;
 
-    const response = await fetch(url, {
+    const { response, error } = await serverFetch(url, {
       method: 'GET',
-      headers,
       cache: 'no-store',
     });
 
-    if (!response.ok) {
-      console.warn('[LeavePolicyActions] GET error:', response.status);
+    if (error) {
       return {
         success: false,
-        error: `API 오류: ${response.status}`,
+        error: error.message,
+        __authError: error.code === 'UNAUTHORIZED',
+      };
+    }
+
+    if (!response || !response.ok) {
+      console.warn('[LeavePolicyActions] GET error:', response?.status);
+      return {
+        success: false,
+        error: `API 오류: ${response?.status}`,
       };
     }
 
@@ -118,24 +112,30 @@ export async function updateLeavePolicy(data: Partial<LeavePolicySettings>): Pro
   success: boolean;
   data?: LeavePolicySettings;
   error?: string;
+  __authError?: boolean;
 }> {
   try {
-    const headers = await getApiHeaders();
     const url = `${process.env.NEXT_PUBLIC_API_URL}/api/v1/leave-policy`;
-
     const apiData = transformToApi(data);
 
-    const response = await fetch(url, {
+    const { response, error } = await serverFetch(url, {
       method: 'PUT',
-      headers,
       body: JSON.stringify(apiData),
     });
 
-    if (!response.ok) {
-      console.warn('[LeavePolicyActions] PUT error:', response.status);
+    if (error) {
       return {
         success: false,
-        error: `API 오류: ${response.status}`,
+        error: error.message,
+        __authError: error.code === 'UNAUTHORIZED',
+      };
+    }
+
+    if (!response || !response.ok) {
+      console.warn('[LeavePolicyActions] PUT error:', response?.status);
+      return {
+        success: false,
+        error: `API 오류: ${response?.status}`,
       };
     }