refactor: useToast 커스텀 훅으로 Toast 로직 통합

- hooks/useToast.js 생성 (44줄)
- 적용 파일 (9개):
  - AdminMembers.jsx
  - AdminMemberEdit.jsx
  - AdminAlbums.jsx
  - AdminAlbumForm.jsx
  - AdminAlbumPhotos.jsx
  - AdminSchedule.jsx
  - AdminScheduleForm.jsx
  - AdminScheduleBots.jsx
  - AdminScheduleCategory.jsx
- 각 파일에서 중복된 toast useState/useEffect 제거
- showSuccess/showError 편의 메서드 활용

총 약 70줄의 중복 코드 제거

frontend/src/hooks/useToast.js

@@ -0,0 +1,56 @@
+/**
+ * Toast 상태 관리 커스텀 훅
+ * 자동 숨김 타이머 및 상태 관리를 제공
+ */
+import { useState, useEffect, useCallback } from "react";
+
+function useToast(duration = 3000) {
+  const [toast, setToast] = useState(null);
+
+  // Toast 자동 숨김
+  useEffect(() => {
+    if (toast) {
+      const timer = setTimeout(() => setToast(null), duration);
+      return () => clearTimeout(timer);
+    }
+  }, [toast, duration]);
+
+  // Toast 표시 함수
+  const showToast = useCallback((message, type = "info") => {
+    setToast({ message, type });
+  }, []);
+
+  // 편의 메서드
+  const showSuccess = useCallback(
+    (message) => showToast(message, "success"),
+    [showToast]
+  );
+  const showError = useCallback(
+    (message) => showToast(message, "error"),
+    [showToast]
+  );
+  const showWarning = useCallback(
+    (message) => showToast(message, "warning"),
+    [showToast]
+  );
+  const showInfo = useCallback(
+    (message) => showToast(message, "info"),
+    [showToast]
+  );
+
+  // Toast 숨김 함수
+  const hideToast = useCallback(() => setToast(null), []);
+
+  return {
+    toast,
+    setToast,
+    showToast,
+    showSuccess,
+    showError,
+    showWarning,
+    showInfo,
+    hideToast,
+  };
+}
+
+export default useToast;

frontend/src/pages/pc/admin/AdminAlbumForm.jsx

@@ -7,6 +7,7 @@ import {
 } from 'lucide-react';
 import Toast from '../../../components/Toast';
 import CustomDatePicker from '../../../components/admin/CustomDatePicker';
+import useToast from '../../../hooks/useToast';
 
 // 커스텀 드롭다운 컴포넌트
 function CustomSelect({ value, onChange, options, placeholder }) {
@@ -83,15 +84,7 @@ function AdminAlbumForm() {
     const [saving, setSaving] = useState(false);
     const [coverPreview, setCoverPreview] = useState(null);
     const [coverFile, setCoverFile] = useState(null);
-    const [toast, setToast] = useState(null);
-
-    // Toast 자동 숨김
-    useEffect(() => {
-        if (toast) {
-            const timer = setTimeout(() => setToast(null), 3000);
-            return () => clearTimeout(timer);
-        }
-    }, [toast]);
+    const { toast, setToast } = useToast();
     
     const [formData, setFormData] = useState({
         title: '',

frontend/src/pages/pc/admin/AdminAlbumPhotos.jsx

@@ -8,6 +8,7 @@ import {
     Tag, FolderOpen, Save
 } from 'lucide-react';
 import Toast from '../../../components/Toast';
+import useToast from '../../../hooks/useToast';
 import * as authApi from '../../../api/admin/auth';
 import { getAlbum } from '../../../api/public/albums';
 import { getMembers } from '../../../api/public/members';
@@ -24,7 +25,7 @@ function AdminAlbumPhotos() {
     const [teasers, setTeasers] = useState([]); // 티저 이미지
     const [loading, setLoading] = useState(true);
     const [user, setUser] = useState(null);
-    const [toast, setToast] = useState(null);
+    const { toast, setToast } = useToast();
     const [selectedPhotos, setSelectedPhotos] = useState([]);
     const [uploading, setUploading] = useState(false);
     const [uploadProgress, setUploadProgress] = useState(0);
@@ -139,14 +140,6 @@ function AdminAlbumPhotos() {
         }));
     };
 
-    // Toast 자동 숨김
-    useEffect(() => {
-        if (toast) {
-            const timer = setTimeout(() => setToast(null), 3000);
-            return () => clearTimeout(timer);
-        }
-    }, [toast]);
-
     useEffect(() => {
         // 로그인 확인
         if (!authApi.hasToken()) {

frontend/src/pages/pc/admin/AdminAlbums.jsx

@@ -7,6 +7,7 @@ import {
 } from 'lucide-react';
 import Toast from '../../../components/Toast';
 import Tooltip from '../../../components/Tooltip';
+import useToast from '../../../hooks/useToast';
 import * as authApi from '../../../api/admin/auth';
 import { getAlbums } from '../../../api/public/albums';
 import * as albumsApi from '../../../api/admin/albums';
@@ -17,18 +18,10 @@ function AdminAlbums() {
     const [loading, setLoading] = useState(true);
     const [searchQuery, setSearchQuery] = useState('');
     const [user, setUser] = useState(null);
-    const [toast, setToast] = useState(null);
+    const { toast, setToast } = useToast();
     const [deleteDialog, setDeleteDialog] = useState({ show: false, album: null });
     const [deleting, setDeleting] = useState(false);
 
-    // Toast 자동 숨김
-    useEffect(() => {
-        if (toast) {
-            const timer = setTimeout(() => setToast(null), 3000);
-            return () => clearTimeout(timer);
-        }
-    }, [toast]);
-
     useEffect(() => {
         // 로그인 확인
         if (!authApi.hasToken()) {

frontend/src/pages/pc/admin/AdminMemberEdit.jsx

@@ -7,6 +7,7 @@ import {
 } from 'lucide-react';
 import Toast from '../../../components/Toast';
 import CustomDatePicker from '../../../components/admin/CustomDatePicker';
+import useToast from '../../../hooks/useToast';
 import * as authApi from '../../../api/admin/auth';
 import * as membersApi from '../../../api/admin/members';
 
@@ -16,7 +17,7 @@ function AdminMemberEdit() {
     const [user, setUser] = useState(null);
     const [loading, setLoading] = useState(true);
     const [saving, setSaving] = useState(false);
-    const [toast, setToast] = useState(null);
+    const { toast, setToast } = useToast();
     const [imagePreview, setImagePreview] = useState(null);
     const [imageFile, setImageFile] = useState(null);
     
@@ -28,14 +29,6 @@ function AdminMemberEdit() {
         is_former: false
     });
 
-    // Toast 자동 숨김
-    useEffect(() => {
-        if (toast) {
-            const timer = setTimeout(() => setToast(null), 3000);
-            return () => clearTimeout(timer);
-        }
-    }, [toast]);
-
     useEffect(() => {
         // 로그인 확인
         if (!authApi.hasToken()) {

frontend/src/pages/pc/admin/AdminMembers.jsx

@@ -6,21 +6,14 @@ import {
     Home, ChevronRight, Users, User
 } from 'lucide-react';
 import Toast from '../../../components/Toast';
+import useToast from '../../../hooks/useToast';
 
 function AdminMembers() {
     const navigate = useNavigate();
     const [members, setMembers] = useState([]);
     const [loading, setLoading] = useState(true);
     const [user, setUser] = useState(null);
-    const [toast, setToast] = useState(null);
-
-    // Toast 자동 숨김
-    useEffect(() => {
-        if (toast) {
-            const timer = setTimeout(() => setToast(null), 3000);
-            return () => clearTimeout(timer);
-        }
-    }, [toast]);
+    const { toast, setToast } = useToast();
 
     useEffect(() => {
         // 로그인 확인

frontend/src/pages/pc/admin/AdminSchedule.jsx

@@ -11,6 +11,7 @@ import { useInView } from 'react-intersection-observer';
 import Toast from '../../../components/Toast';
 import Tooltip from '../../../components/Tooltip';
 import useScheduleStore from '../../../stores/useScheduleStore';
+import useToast from '../../../hooks/useToast';
 import { getTodayKST, formatDate } from '../../../utils/date';
 import * as schedulesApi from '../../../api/admin/schedules';
 import * as categoriesApi from '../../../api/admin/categories';
@@ -138,7 +139,7 @@ function AdminSchedule() {
     // 로컬 상태 (페이지 이동 시 유지할 필요 없는 것들)
     const [loading, setLoading] = useState(false);
     const [user, setUser] = useState(null);
-    const [toast, setToast] = useState(null);
+    const { toast, setToast } = useToast();
     const scrollContainerRef = useRef(null);
     const SEARCH_LIMIT = 5; // 테스트용 5개
     
@@ -304,14 +305,6 @@ function AdminSchedule() {
         return cat?.color || '#4A7C59';
     };
 
-    // Toast 자동 숨김
-    useEffect(() => {
-        if (toast) {
-            const timer = setTimeout(() => setToast(null), 3000);
-            return () => clearTimeout(timer);
-        }
-    }, [toast]);
-
     useEffect(() => {
         const token = localStorage.getItem('adminToken');
         const userData = localStorage.getItem('adminUser');

frontend/src/pages/pc/admin/AdminScheduleBots.jsx

@@ -7,26 +7,19 @@ import {
 } from 'lucide-react';
 import Toast from '../../../components/Toast';
 import Tooltip from '../../../components/Tooltip';
+import useToast from '../../../hooks/useToast';
 import * as botsApi from '../../../api/admin/bots';
 
 function AdminScheduleBots() {
     const navigate = useNavigate();
     const [user, setUser] = useState(null);
-    const [toast, setToast] = useState(null);
+    const { toast, setToast } = useToast();
     const [bots, setBots] = useState([]);
     const [loading, setLoading] = useState(true);
     const [isInitialLoad, setIsInitialLoad] = useState(true); // 첫 로드 여부 (애니메이션용)
     const [syncing, setSyncing] = useState(null); // 동기화 중인 봇 ID
     const [quotaWarning, setQuotaWarning] = useState(null); // 할당량 경고 상태
 
-    // Toast 자동 숨김
-    useEffect(() => {
-        if (toast) {
-            const timer = setTimeout(() => setToast(null), 3000);
-            return () => clearTimeout(timer);
-        }
-    }, [toast]);
-
     useEffect(() => {
         const token = localStorage.getItem('adminToken');
         const userData = localStorage.getItem('adminUser');

frontend/src/pages/pc/admin/AdminScheduleCategory.jsx

@@ -4,6 +4,7 @@ import { motion, AnimatePresence, Reorder } from 'framer-motion';
 import { LogOut, Home, ChevronRight, Plus, Edit3, Trash2, GripVertical, X, AlertTriangle } from 'lucide-react';
 import { HexColorPicker } from 'react-colorful';
 import Toast from '../../../components/Toast';
+import useToast from '../../../hooks/useToast';
 import * as authApi from '../../../api/admin/auth';
 import * as categoriesApi from '../../../api/admin/categories';
 
@@ -38,13 +39,7 @@ function AdminScheduleCategory() {
     const [user, setUser] = useState(null);
     const [categories, setCategories] = useState([]);
     const [loading, setLoading] = useState(true);
-    const [toast, setToast] = useState(null);
-    
-    // 토스트 표시 (3초 후 자동 닫힘)
-    const showToast = (type, message) => {
-        setToast({ type, message });
-        setTimeout(() => setToast(null), 3000);
-    };
+    const { toast, setToast, showSuccess, showError } = useToast();
     
     // 모달 상태
     const [modalOpen, setModalOpen] = useState(false);
@@ -84,7 +79,7 @@ function AdminScheduleCategory() {
             setCategories(data);
         } catch (error) {
             console.error('카테고리 조회 오류:', error);
-            showToast('error', '카테고리를 불러오는데 실패했습니다.');
+            showError('카테고리를 불러오는데 실패했습니다.');
         } finally {
             setLoading(false);
         }
@@ -112,7 +107,7 @@ function AdminScheduleCategory() {
     // 카테고리 저장
     const handleSave = async () => {
         if (!formData.name.trim()) {
-            showToast('error', '카테고리 이름을 입력해주세요.');
+            showError('카테고리 이름을 입력해주세요.');
             return;
         }
 
@@ -122,7 +117,7 @@ function AdminScheduleCategory() {
                 && cat.id !== editingCategory?.id
         );
         if (isDuplicate) {
-            showToast('error', '이미 존재하는 카테고리입니다.');
+            showError('이미 존재하는 카테고리입니다.');
             return;
         }
         
@@ -132,12 +127,12 @@ function AdminScheduleCategory() {
             } else {
                 await categoriesApi.createCategory(formData);
             }
-            showToast('success', editingCategory ? '카테고리가 수정되었습니다.' : '카테고리가 추가되었습니다.');
+            showSuccess(editingCategory ? '카테고리가 수정되었습니다.' : '카테고리가 추가되었습니다.');
             setModalOpen(false);
             fetchCategories();
         } catch (error) {
             console.error('저장 오류:', error);
-            showToast('error', error.message || '저장에 실패했습니다.');
+            showError(error.message || '저장에 실패했습니다.');
         }
     };
 
@@ -153,13 +148,13 @@ function AdminScheduleCategory() {
         
         try {
             await categoriesApi.deleteCategory(deleteTarget.id);
-            showToast('success', '카테고리가 삭제되었습니다.');
+            showSuccess('카테고리가 삭제되었습니다.');
             setDeleteDialogOpen(false);
             setDeleteTarget(null);
             fetchCategories();
         } catch (error) {
             console.error('삭제 오류:', error);
-            showToast('error', error.message || '삭제에 실패했습니다.');
+            showError(error.message || '삭제에 실패했습니다.');
         }
     };
 

frontend/src/pages/pc/admin/AdminScheduleForm.jsx

@@ -27,6 +27,7 @@ import {
 import Toast from "../../../components/Toast";
 import Lightbox from "../../../components/common/Lightbox";
 import CustomDatePicker from "../../../components/admin/CustomDatePicker";
+import useToast from "../../../hooks/useToast";
 import * as authApi from "../../../api/admin/auth";
 import * as categoriesApi from "../../../api/admin/categories";
 import * as schedulesApi from "../../../api/admin/schedules";
@@ -401,7 +402,7 @@ function AdminScheduleForm() {
   const isEditMode = !!id;
 
   const [user, setUser] = useState(null);
-  const [toast, setToast] = useState(null);
+  const { toast, setToast } = useToast();
   const [loading, setLoading] = useState(false);
   const [members, setMembers] = useState([]);
 
@@ -507,14 +508,6 @@ function AdminScheduleForm() {
     }
   };
 
-  // Toast 자동 숨김
-  useEffect(() => {
-    if (toast) {
-      const timer = setTimeout(() => setToast(null), 3000);
-      return () => clearTimeout(timer);
-    }
-  }, [toast]);
-
   useEffect(() => {
     if (!authApi.hasToken()) {
       navigate("/admin");