diff --git a/frontend-temp/src/components/common/Lightbox.jsx b/frontend-temp/src/components/common/Lightbox.jsx
index 11b2dfc..8a17f16 100644
--- a/frontend-temp/src/components/common/Lightbox.jsx
+++ b/frontend-temp/src/components/common/Lightbox.jsx
@@ -84,6 +84,9 @@ function Lightbox({ images, currentIndex, isOpen, onClose, onIndexChange }) {
     <AnimatePresence>
       {isOpen && images.length > 0 && (
         <motion.div
+          role="dialog"
+          aria-modal="true"
+          aria-label="이미지 뷰어"
           initial={{ opacity: 0 }}
           animate={{ opacity: 1 }}
           exit={{ opacity: 0 }}
@@ -96,22 +99,24 @@ function Lightbox({ images, currentIndex, isOpen, onClose, onIndexChange }) {
           <div className="min-w-[800px] min-h-[600px] w-full h-full relative flex items-center justify-center">
             {/* 닫기 버튼 */}
             <button
+              aria-label="닫기"
               className="absolute top-6 right-6 text-white/70 hover:text-white transition-colors z-10"
               onClick={onClose}
             >
-              <X size={32} />
+              <X size={32} aria-hidden="true" />
             </button>
 
             {/* 이전 버튼 */}
             {images.length > 1 && (
               <button
+                aria-label="이전 이미지"
                 className="absolute left-6 p-2 text-white/70 hover:text-white transition-colors z-10"
                 onClick={(e) => {
                   e.stopPropagation();
                   goToPrev();
                 }}
               >
-                <ChevronLeft size={48} />
+                <ChevronLeft size={48} aria-hidden="true" />
               </button>
             )}
 
@@ -142,13 +147,14 @@ function Lightbox({ images, currentIndex, isOpen, onClose, onIndexChange }) {
             {/* 다음 버튼 */}
             {images.length > 1 && (
               <button
+                aria-label="다음 이미지"
                 className="absolute right-6 p-2 text-white/70 hover:text-white transition-colors z-10"
                 onClick={(e) => {
                   e.stopPropagation();
                   goToNext();
                 }}
               >
-                <ChevronRight size={48} />
+                <ChevronRight size={48} aria-hidden="true" />
               </button>
             )}
 
diff --git a/frontend-temp/src/components/common/LightboxIndicator.jsx b/frontend-temp/src/components/common/LightboxIndicator.jsx
index 5766ba5..ef025f4 100644
--- a/frontend-temp/src/components/common/LightboxIndicator.jsx
+++ b/frontend-temp/src/components/common/LightboxIndicator.jsx
@@ -39,6 +39,8 @@ const LightboxIndicator = memo(function LightboxIndicator({
         {Array.from({ length: count }).map((_, i) => (
           <button
             key={i}
+            aria-label={`이미지 ${i + 1}/${count}`}
+            aria-current={i === currentIndex ? 'true' : undefined}
             className={`rounded-full flex-shrink-0 transition-all duration-300 ${
               i === currentIndex
                 ? 'w-3 h-3 bg-white'
diff --git a/frontend-temp/src/components/common/Toast.jsx b/frontend-temp/src/components/common/Toast.jsx
index 2cfc125..1fbb2ba 100644
--- a/frontend-temp/src/components/common/Toast.jsx
+++ b/frontend-temp/src/components/common/Toast.jsx
@@ -10,6 +10,8 @@ function Toast({ toast, onClose }) {
     <AnimatePresence>
       {toast && (
         <motion.div
+          role="alert"
+          aria-live="polite"
           initial={{ opacity: 0, y: 50 }}
           animate={{ opacity: 1, y: 0 }}
           exit={{ opacity: 0, y: 50 }}
diff --git a/frontend-temp/src/components/mobile/BirthdayCard.jsx b/frontend-temp/src/components/mobile/BirthdayCard.jsx
index ce24f86..efc603f 100644
--- a/frontend-temp/src/components/mobile/BirthdayCard.jsx
+++ b/frontend-temp/src/components/mobile/BirthdayCard.jsx
@@ -1,3 +1,4 @@
+import { memo } from 'react';
 import { motion } from 'framer-motion';
 import { dayjs, decodeHtmlEntities } from '@/utils';
 
@@ -8,7 +9,7 @@ import { dayjs, decodeHtmlEntities } from '@/utils';
  * @param {number} delay - 애니메이션 딜레이 (초)
  * @param {function} onClick - 클릭 핸들러
  */
-function BirthdayCard({ schedule, showYear = false, delay = 0, onClick }) {
+const BirthdayCard = memo(function BirthdayCard({ schedule, showYear = false, delay = 0, onClick }) {
   const scheduleDate = dayjs(schedule.date);
   const formatted = {
     year: scheduleDate.year(),
@@ -79,6 +80,6 @@ function BirthdayCard({ schedule, showYear = false, delay = 0, onClick }) {
       {CardContent}
     </div>
   );
-}
+});
 
 export default BirthdayCard;
diff --git a/frontend-temp/src/components/mobile/Calendar.jsx b/frontend-temp/src/components/mobile/Calendar.jsx
index 90b16ce..154eda5 100644
--- a/frontend-temp/src/components/mobile/Calendar.jsx
+++ b/frontend-temp/src/components/mobile/Calendar.jsx
@@ -204,7 +204,13 @@ function Calendar({
           const daySchedules = item.isCurrentMonth ? getDaySchedules(item.date) : [];
 
           return (
-            <button key={index} onClick={() => onSelectDate(item.date)} className="flex flex-col items-center py-2">
+            <button
+              key={index}
+              aria-label={`${item.date.getMonth() + 1}월 ${item.day}일${isToday(item.date) ? ' (오늘)' : ''}${daySchedules.length > 0 ? `, 일정 ${daySchedules.length}개` : ''}`}
+              aria-pressed={isSelected(item.date)}
+              onClick={() => onSelectDate(item.date)}
+              className="flex flex-col items-center py-2"
+            >
               <span
                 className={`w-9 h-9 flex items-center justify-center text-sm font-medium rounded-full transition-all ${
                   !item.isCurrentMonth
@@ -259,19 +265,20 @@ function Calendar({
             {/* 년도 범위 헤더 */}
             <div className="flex items-center justify-between mb-3">
               <button
+                aria-label="이전 연도 범위"
                 onClick={() =>
                   canGoPrevYearRange && setYearRangeStart(Math.max(MIN_YEAR, yearRangeStart - 12))
                 }
                 disabled={!canGoPrevYearRange}
                 className={`p-1 ${canGoPrevYearRange ? '' : 'opacity-30'}`}
               >
-                <ChevronLeft size={18} />
+                <ChevronLeft size={18} aria-hidden="true" />
               </button>
               <span className="font-semibold text-sm">
                 {yearRangeStart} - {yearRangeStart + 11}
               </span>
-              <button onClick={() => setYearRangeStart(yearRangeStart + 12)} className="p-1">
-                <ChevronRight size={18} />
+              <button aria-label="다음 연도 범위" onClick={() => setYearRangeStart(yearRangeStart + 12)} className="p-1">
+                <ChevronRight size={18} aria-hidden="true" />
               </button>
             </div>
 
@@ -283,6 +290,8 @@ function Calendar({
                 return (
                   <button
                     key={y}
+                    aria-label={`${y}년 선택`}
+                    aria-pressed={y === year}
                     onClick={() => {
                       const newDate = new Date(viewDate);
                       newDate.setFullYear(y);
@@ -311,6 +320,8 @@ function Calendar({
                 return (
                   <button
                     key={m}
+                    aria-label={`${m}월 선택`}
+                    aria-pressed={m === month + 1}
                     onClick={() => {
                       const newDate = new Date(year, m - 1, 1);
                       setViewDate(newDate);
@@ -342,21 +353,24 @@ function Calendar({
             {!hideHeader && (
               <div className="flex items-center justify-between mb-4">
                 <button
+                  aria-label="이전 달"
                   onClick={() => changeMonth(-1)}
                   disabled={!canGoPrevMonth}
                   className={`p-1 ${!canGoPrevMonth ? 'opacity-30' : ''}`}
                 >
-                  <ChevronLeft size={18} />
+                  <ChevronLeft size={18} aria-hidden="true" />
                 </button>
                 <button
+                  aria-label="년/월 선택"
+                  aria-expanded={showYearMonth}
                   onClick={() => setShowYearMonth(true)}
                   className="flex items-center gap-1 font-semibold text-sm hover:text-primary transition-colors"
                 >
                   {year}년 {month + 1}월
-                  <ChevronDown size={16} />
+                  <ChevronDown size={16} aria-hidden="true" />
                 </button>
-                <button onClick={() => changeMonth(1)} className="p-1">
-                  <ChevronRight size={18} />
+                <button aria-label="다음 달" onClick={() => changeMonth(1)} className="p-1">
+                  <ChevronRight size={18} aria-hidden="true" />
                 </button>
               </div>
             )}
@@ -367,6 +381,7 @@ function Calendar({
             {/* 오늘 버튼 */}
             <div className="mt-3 flex justify-center">
               <button
+                aria-label="오늘 날짜로 이동"
                 onClick={() => onSelectDate(new Date())}
                 className="text-xs text-primary font-medium px-4 py-1.5 bg-primary/10 rounded-full"
               >
diff --git a/frontend-temp/src/components/mobile/ScheduleCard.jsx b/frontend-temp/src/components/mobile/ScheduleCard.jsx
index 8099824..5ae1578 100644
--- a/frontend-temp/src/components/mobile/ScheduleCard.jsx
+++ b/frontend-temp/src/components/mobile/ScheduleCard.jsx
@@ -1,3 +1,4 @@
+import { memo } from 'react';
 import { Clock, Tag, Link2 } from 'lucide-react';
 import { decodeHtmlEntities, getDisplayMembers, getCategoryInfo, getScheduleTime } from '@/utils';
 
@@ -6,7 +7,7 @@ import { decodeHtmlEntities, getDisplayMembers, getCategoryInfo, getScheduleTime
  * 홈 페이지의 다가오는 일정 섹션에서 사용
  * 간결한 레이아웃
  */
-function ScheduleCard({ schedule, onClick, className = '' }) {
+const ScheduleCard = memo(function ScheduleCard({ schedule, onClick, className = '' }) {
   const scheduleDate = new Date(schedule.date);
   const today = new Date();
   const currentYear = today.getFullYear();
@@ -94,6 +95,6 @@ function ScheduleCard({ schedule, onClick, className = '' }) {
       </div>
     </div>
   );
-}
+});
 
 export default ScheduleCard;
diff --git a/frontend-temp/src/components/mobile/ScheduleListCard.jsx b/frontend-temp/src/components/mobile/ScheduleListCard.jsx
index cc17516..9f21e37 100644
--- a/frontend-temp/src/components/mobile/ScheduleListCard.jsx
+++ b/frontend-temp/src/components/mobile/ScheduleListCard.jsx
@@ -1,3 +1,4 @@
+import { memo } from 'react';
 import { motion } from 'framer-motion';
 import { Clock, Link2 } from 'lucide-react';
 import { decodeHtmlEntities, getDisplayMembers, getCategoryInfo, getScheduleTime } from '@/utils';
@@ -7,7 +8,7 @@ import { decodeHtmlEntities, getDisplayMembers, getCategoryInfo, getScheduleTime
  * 스케줄 페이지에서 날짜별 일정 목록에 사용
  * 날짜가 이미 헤더에 표시되므로 날짜 없이 표시
  */
-function ScheduleListCard({
+const ScheduleListCard = memo(function ScheduleListCard({
   schedule,
   onClick,
   delay = 0,
@@ -81,6 +82,6 @@ function ScheduleListCard({
       </div>
     </motion.div>
   );
-}
+});
 
 export default ScheduleListCard;
diff --git a/frontend-temp/src/components/mobile/ScheduleSearchCard.jsx b/frontend-temp/src/components/mobile/ScheduleSearchCard.jsx
index 1c405da..527b091 100644
--- a/frontend-temp/src/components/mobile/ScheduleSearchCard.jsx
+++ b/frontend-temp/src/components/mobile/ScheduleSearchCard.jsx
@@ -1,3 +1,4 @@
+import { memo } from 'react';
 import { motion } from 'framer-motion';
 import { Clock, Link2 } from 'lucide-react';
 import { decodeHtmlEntities, getDisplayMembers, getCategoryInfo, getScheduleTime } from '@/utils';
@@ -7,7 +8,7 @@ import { decodeHtmlEntities, getDisplayMembers, getCategoryInfo, getScheduleTime
  * 스케줄 페이지의 검색 결과에서 사용
  * 날짜를 왼쪽에 표시하는 레이아웃
  */
-function ScheduleSearchCard({
+const ScheduleSearchCard = memo(function ScheduleSearchCard({
   schedule,
   onClick,
   delay = 0,
@@ -110,6 +111,6 @@ function ScheduleSearchCard({
       </div>
     </motion.div>
   );
-}
+});
 
 export default ScheduleSearchCard;
diff --git a/frontend-temp/src/components/pc/BirthdayCard.jsx b/frontend-temp/src/components/pc/BirthdayCard.jsx
index 6cc7dc8..8fa3d30 100644
--- a/frontend-temp/src/components/pc/BirthdayCard.jsx
+++ b/frontend-temp/src/components/pc/BirthdayCard.jsx
@@ -1,9 +1,10 @@
+import { memo } from 'react';
 import { dayjs } from '@/utils';
 
 /**
  * PC용 생일 카드 컴포넌트
  */
-function BirthdayCard({ schedule, showYear = false, onClick }) {
+const BirthdayCard = memo(function BirthdayCard({ schedule, showYear = false, onClick }) {
   const scheduleDate = dayjs(schedule.date);
   const formatted = {
     year: scheduleDate.year(),
@@ -55,6 +56,6 @@ function BirthdayCard({ schedule, showYear = false, onClick }) {
       </div>
     </div>
   );
-}
+});
 
 export default BirthdayCard;
diff --git a/frontend-temp/src/components/pc/Calendar.jsx b/frontend-temp/src/components/pc/Calendar.jsx
index ab35ff2..8ce8c5d 100644
--- a/frontend-temp/src/components/pc/Calendar.jsx
+++ b/frontend-temp/src/components/pc/Calendar.jsx
@@ -137,21 +137,24 @@ function Calendar({
         {/* 헤더 */}
         <div className="flex items-center justify-between mb-8">
           <button
+            aria-label="이전 달"
             onClick={prevMonth}
             disabled={!canGoPrevMonth}
             className={`p-2 rounded-full transition-colors ${canGoPrevMonth ? 'hover:bg-gray-100' : 'opacity-30'}`}
           >
-            <ChevronLeft size={24} />
+            <ChevronLeft size={24} aria-hidden="true" />
           </button>
           <button
+            aria-label="년/월 선택"
+            aria-expanded={showYearMonthPicker}
             onClick={() => setShowYearMonthPicker(!showYearMonthPicker)}
             className="flex items-center gap-1 text-xl font-bold hover:text-primary transition-colors"
           >
             <span>{year}년 {month + 1}월</span>
-            <ChevronDown size={20} className={`transition-transform ${showYearMonthPicker ? 'rotate-180' : ''}`} />
+            <ChevronDown size={20} aria-hidden="true" className={`transition-transform ${showYearMonthPicker ? 'rotate-180' : ''}`} />
           </button>
-          <button onClick={nextMonth} className="p-2 hover:bg-gray-100 rounded-full transition-colors">
-            <ChevronRight size={24} />
+          <button aria-label="다음 달" onClick={nextMonth} className="p-2 hover:bg-gray-100 rounded-full transition-colors">
+            <ChevronRight size={24} aria-hidden="true" />
           </button>
         </div>
 
@@ -166,17 +169,18 @@ function Calendar({
             >
               <div className="flex items-center justify-between mb-4">
                 <button
+                  aria-label="이전 연도 범위"
                   onClick={prevYearRange}
                   disabled={!canGoPrevYearRange}
                   className={`p-1.5 rounded-lg transition-colors ${canGoPrevYearRange ? 'hover:bg-gray-100' : 'opacity-30'}`}
                 >
-                  <ChevronLeft size={20} className="text-gray-600" />
+                  <ChevronLeft size={20} aria-hidden="true" className="text-gray-600" />
                 </button>
                 <span className="font-medium text-gray-900">
                   {yearRange[0]} - {yearRange[yearRange.length - 1]}
                 </span>
-                <button onClick={nextYearRange} className="p-1.5 hover:bg-gray-100 rounded-lg transition-colors">
-                  <ChevronRight size={20} className="text-gray-600" />
+                <button aria-label="다음 연도 범위" onClick={nextYearRange} className="p-1.5 hover:bg-gray-100 rounded-lg transition-colors">
+                  <ChevronRight size={20} aria-hidden="true" className="text-gray-600" />
                 </button>
               </div>
 
@@ -186,6 +190,8 @@ function Calendar({
                 {yearRange.map((y) => (
                   <button
                     key={y}
+                    aria-label={`${y}년 선택`}
+                    aria-pressed={year === y}
                     onClick={() => selectYear(y)}
                     className={`py-2 text-sm rounded-lg transition-colors ${
                       year === y
@@ -206,6 +212,8 @@ function Calendar({
                 {MONTHS.map((m, i) => (
                   <button
                     key={m}
+                    aria-label={`${m} 선택`}
+                    aria-pressed={month === i}
                     onClick={() => selectMonth(i)}
                     className={`py-2 text-sm rounded-lg transition-colors ${
                       month === i
@@ -269,6 +277,8 @@ function Calendar({
                 return (
                   <button
                     key={day}
+                    aria-label={`${month + 1}월 ${day}일${isToday ? ' (오늘)' : ''}${daySchedules.length > 0 ? `, 일정 ${daySchedules.length}개` : ''}`}
+                    aria-pressed={isSelected}
                     onClick={() => selectDate(day)}
                     className={`aspect-square flex flex-col items-center justify-center rounded-full text-base font-medium transition-all relative hover:bg-gray-100
                       ${isSelected ? 'bg-primary text-white shadow-lg hover:bg-primary' : ''}
diff --git a/frontend-temp/src/components/pc/ScheduleCard.jsx b/frontend-temp/src/components/pc/ScheduleCard.jsx
index 9dfe4c6..e03d79a 100644
--- a/frontend-temp/src/components/pc/ScheduleCard.jsx
+++ b/frontend-temp/src/components/pc/ScheduleCard.jsx
@@ -1,3 +1,4 @@
+import { memo } from 'react';
 import { Clock, Tag, Link2 } from 'lucide-react';
 import { decodeHtmlEntities, getDisplayMembers, getCategoryInfo, getScheduleTime } from '@/utils';
 
@@ -5,7 +6,7 @@ import { decodeHtmlEntities, getDisplayMembers, getCategoryInfo, getScheduleTime
  * PC용 일정 카드 컴포넌트
  * 홈, 스케줄 페이지에서 공통으로 사용
  */
-function ScheduleCard({ schedule, onClick, className = '' }) {
+const ScheduleCard = memo(function ScheduleCard({ schedule, onClick, className = '' }) {
   const scheduleDate = new Date(schedule.date);
   const today = new Date();
   const currentYear = today.getFullYear();
@@ -89,6 +90,6 @@ function ScheduleCard({ schedule, onClick, className = '' }) {
       </div>
     </div>
   );
-}
+});
 
 export default ScheduleCard;
diff --git a/frontend-temp/src/hooks/useAdminAuth.js b/frontend-temp/src/hooks/useAdminAuth.js
index 54f5236..356c995 100644
--- a/frontend-temp/src/hooks/useAdminAuth.js
+++ b/frontend-temp/src/hooks/useAdminAuth.js
@@ -1,4 +1,4 @@
-import { useEffect } from 'react';
+import { useEffect, useRef } from 'react';
 import { useNavigate } from 'react-router-dom';
 import { useQuery } from '@tanstack/react-query';
 import { useAuthStore } from '@/stores';
@@ -16,9 +16,13 @@ export function useAdminAuth(options = {}) {
   const navigate = useNavigate();
   const { token, user, logout, isAuthenticated } = useAuthStore();
 
-  // 토큰 검증 쿼리
+  // logout 함수를 ref로 안정화하여 무한 루프 방지
+  const logoutRef = useRef(logout);
+  logoutRef.current = logout;
+
+  // 토큰 검증 쿼리 - 고유 queryKey 사용
   const { data, isLoading, isError } = useQuery({
-    queryKey: ['admin', 'auth'],
+    queryKey: ['admin', 'auth', 'verify'],
     queryFn: authApi.verifyToken,
     enabled: !!token,
     retry: false,
@@ -29,10 +33,10 @@ export function useAdminAuth(options = {}) {
   // 리다이렉트는 DOM 조작이므로 useEffect 사용 허용
   useEffect(() => {
     if (required && (!token || isError)) {
-      logout();
+      logoutRef.current();
       navigate(redirectTo);
     }
-  }, [token, isError, required, logout, navigate, redirectTo]);
+  }, [token, isError, required, navigate, redirectTo]);
 
   return {
     user: data?.user || user,
@@ -49,11 +53,11 @@ export function useAdminAuth(options = {}) {
  */
 export function useRedirectIfAuthenticated(redirectTo = '/admin/dashboard') {
   const navigate = useNavigate();
-  const { isAuthenticated, token } = useAuthStore();
+  const { token } = useAuthStore();
 
-  // 토큰 검증
+  // 토큰 검증 - 고유 queryKey 사용
   const { data, isLoading } = useQuery({
-    queryKey: ['admin', 'auth'],
+    queryKey: ['admin', 'auth', 'redirect-check'],
     queryFn: authApi.verifyToken,
     enabled: !!token,
     retry: false,
diff --git a/frontend-temp/src/stores/useAuthStore.js b/frontend-temp/src/stores/useAuthStore.js
index 75147a5..db68731 100644
--- a/frontend-temp/src/stores/useAuthStore.js
+++ b/frontend-temp/src/stores/useAuthStore.js
@@ -30,15 +30,6 @@ const useAuthStore = create(
           isAuthenticated: false,
         });
       },
-
-      // 토큰 가져오기
-      getToken: () => get().token,
-
-      // 인증 여부 확인
-      checkAuth: () => {
-        const { token } = get();
-        return !!token;
-      },
     }),
     {
       name: 'auth-storage',
diff --git a/frontend-temp/src/stores/useUIStore.js b/frontend-temp/src/stores/useUIStore.js
index 877f923..4c68426 100644
--- a/frontend-temp/src/stores/useUIStore.js
+++ b/frontend-temp/src/stores/useUIStore.js
@@ -93,29 +93,6 @@ const useUIStore = create((set, get) => ({
   // ===== 로딩 =====
   globalLoading: false,
   setGlobalLoading: (value) => set({ globalLoading: value }),
-
-  // ===== 확인 다이얼로그 =====
-  confirmDialog: null,
-
-  showConfirm: (options) => {
-    return new Promise((resolve) => {
-      set({
-        confirmDialog: {
-          ...options,
-          onConfirm: () => {
-            set({ confirmDialog: null });
-            resolve(true);
-          },
-          onCancel: () => {
-            set({ confirmDialog: null });
-            resolve(false);
-          },
-        },
-      });
-    });
-  },
-
-  closeConfirm: () => set({ confirmDialog: null }),
 }));
 
 export default useUIStore;