feat(ui): P4-4 별점 공통화 + 로그인 모달 접근성 (#281+#283)

#281 (리뷰/메모 UI):
- Stars 컴포넌트 신규 (lib 분리 가능한 공통 별점) — 0.5 단위 절반 채우기 시각 구분
- ReviewSection/MemoSection의 StarDisplay 제거 → 공통 Stars 사용 (시각 일관성)
- StarSelector: role='radiogroup'/role='radio' + aria-checked, 44×44px 터치 영역,
  반쪽 별 '⯨' 표시로 시각 차별화
- ReviewSection/MemoSection: API 실패 try/catch + alert 사용자 피드백
- MyReviewsList: Math.round 별점 → Stars 0.5단위 정확 렌더

#283 (로그인 메뉴):
- LoginMenu: useEscapeKey + useFocusTrap + useBodyScrollLock 적용
- role='dialog' / aria-modal / aria-labelledby / aria-label='로그인 창 닫기'
- onError 콘솔만 → 인라인 role='alert' 메시지로 사용자 피드백
- max-w-xs → max-w-sm (위젯 260px + 패딩 24px = 308px 안전 수용)

후속 분리:
- #343 (next/image + ARIA Tabs + Stars 테스트)
- #344 (z-index 토큰 + i18n)

Refs: #281 #283

CHANGELOG.md

@@ -6,6 +6,20 @@
 
 ## 2026-06-15
 
+### 🔐 P4-3 인증 메시지 + 지도 접근성 (v0.1.22)
+- #266: Google verifier 실패 메시지 고정 + log.warn (정보 누출 차단)
+- #278: boundsTimerRef cleanup, '내 위치' 44px + aria-label, dead code 제거
+- #277: 결함 모두 후속(#338) — deep health/version/테스트는 별도
+- 후속 분리: #338(deep health), #339(브랜드 토큰화/마커 ARIA), #340(다중 audience)
+- Refs: #266 #277 #278 (close)
+
+### ⚙️ P4-2 데몬/캐시/통계 결함 (v0.1.21)
+- #275: updateConfig 가드(1+ 정수), Scheduler try-finally updateLastX, GET config admin-only
+- #276: ping try-with-resources + ConnectionFactory null 가드, makeKey null 가드
+- #274: SiteVisitStats int → long, recordVisit DataIntegrityViolationException 1회 재시도
+- 후속 분리: #335 (분산락), #336 (SCAN/자동복구), #337 (봇/레이트리밋)
+- Refs: #275 #276 #274 (close)
+
 ### 🧱 P4-1 백엔드 CRUD 결함 (v0.1.20)
 - #294: MemoService/ReviewService 동시성 DuplicateKeyException 가드, rating 0~5 검증, getAvgRating NVL
 - #295: 유니크 충돌 typed exception, channel_id "UC..." 형식 명시 분기, findByChannelId 컬럼 보완, body null 가드

backend-java/src/main/java/com/tasteby/controller/DaemonController.java

@@ -19,6 +19,8 @@ public class DaemonController {
 
     @GetMapping("/config")
     public DaemonConfig getConfig() {
+        // #275 — 데몬 운영 설정은 admin 전용 (이전: 공개 노출 — 정보 누출 위험)
+        AuthUtil.requireAdmin();
         DaemonConfig config = daemonConfigService.getConfig();
         return config != null ? config : DaemonConfig.builder().build();
     }

backend-java/src/main/java/com/tasteby/domain/SiteVisitStats.java

@@ -10,6 +10,7 @@ import lombok.NoArgsConstructor;
 @NoArgsConstructor
 @AllArgsConstructor
 public class SiteVisitStats {
-    private int today;
-    private int total;
+    // #274 — long으로 변경 (21억 이상 누적 시 int 오버플로 방지)
+    private long today;
+    private long total;
 }

backend-java/src/main/java/com/tasteby/mapper/StatsMapper.java

@@ -7,7 +7,7 @@ public interface StatsMapper {
 
     void recordVisit();
 
-    int getTodayVisits();
+    long getTodayVisits();
 
-    int getTotalVisits();
+    long getTotalVisits();
 }

backend-java/src/main/java/com/tasteby/service/AuthService.java

@@ -6,6 +6,8 @@ import com.google.api.client.http.javanet.NetHttpTransport;
 import com.google.api.client.json.gson.GsonFactory;
 import com.tasteby.domain.UserInfo;
 import com.tasteby.security.JwtTokenProvider;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.http.HttpStatus;
 import org.springframework.stereotype.Service;
@@ -17,6 +19,8 @@ import java.util.Map;
 @Service
 public class AuthService {
 
+    private static final Logger log = LoggerFactory.getLogger(AuthService.class);
+
     private final UserService userService;
     private final JwtTokenProvider jwtProvider;
     private final GoogleIdTokenVerifier verifier;
@@ -58,7 +62,10 @@ public class AuthService {
         } catch (ResponseStatusException e) {
             throw e;
         } catch (Exception e) {
-            throw new ResponseStatusException(HttpStatus.UNAUTHORIZED, "Invalid Google token: " + e.getMessage());
+            // #266 — 외부에는 고정 메시지만, 상세는 로그로 (Google verifier 내부 네트워크/공개키
+            // 조회 실패 메시지가 클라이언트에 노출되지 않도록)
+            log.warn("Google token verification failed: {}", e.getMessage());
+            throw new ResponseStatusException(HttpStatus.UNAUTHORIZED, "Invalid Google token");
         }
     }
 

backend-java/src/main/java/com/tasteby/service/CacheService.java

@@ -27,8 +27,15 @@ public class CacheService {
         this.redis = redis;
         this.mapper = mapper;
         this.ttl = Duration.ofSeconds(ttlSeconds);
-        try {
-            redis.getConnectionFactory().getConnection().ping();
+        // #276 — ping 연결 자원 누수 방지: try-with-resources
+        var factory = redis.getConnectionFactory();
+        if (factory == null) {
+            log.warn("Redis ConnectionFactory is null, caching disabled");
+            disabled = true;
+            return;
+        }
+        try (var conn = factory.getConnection()) {
+            conn.ping();
             log.info("Redis connected");
         } catch (Exception e) {
             log.warn("Redis unavailable ({}), caching disabled", e.getMessage());
@@ -37,6 +44,13 @@ public class CacheService {
     }
 
     public String makeKey(String... parts) {
+        // #276 — null/빈 파트로 "tasteby::" 같은 잘못된 키 생성 방지
+        if (parts == null || parts.length == 0) {
+            throw new IllegalArgumentException("makeKey requires at least one part");
+        }
+        for (String p : parts) {
+            if (p == null) throw new IllegalArgumentException("makeKey parts must not be null");
+        }
         return PREFIX + String.join(":", parts);
     }
 

backend-java/src/main/java/com/tasteby/service/DaemonConfigService.java

@@ -2,7 +2,9 @@ package com.tasteby.service;
 
 import com.tasteby.domain.DaemonConfig;
 import com.tasteby.mapper.DaemonConfigMapper;
+import org.springframework.http.HttpStatus;
 import org.springframework.stereotype.Service;
+import org.springframework.web.server.ResponseStatusException;
 
 import java.util.Map;
 
@@ -27,20 +29,33 @@ public class DaemonConfigService {
             current.setScanEnabled(Boolean.TRUE.equals(body.get("scan_enabled")));
         }
         if (body.containsKey("scan_interval_min")) {
-            current.setScanIntervalMin(((Number) body.get("scan_interval_min")).intValue());
+            // #275 — 0/음수 입력으로 30초 사이클 폭주 방지. ClassCastException 대신 400.
+            current.setScanIntervalMin(requirePositiveInt(body.get("scan_interval_min"), "scan_interval_min"));
         }
         if (body.containsKey("process_enabled")) {
             current.setProcessEnabled(Boolean.TRUE.equals(body.get("process_enabled")));
         }
         if (body.containsKey("process_interval_min")) {
-            current.setProcessIntervalMin(((Number) body.get("process_interval_min")).intValue());
+            current.setProcessIntervalMin(requirePositiveInt(body.get("process_interval_min"), "process_interval_min"));
         }
         if (body.containsKey("process_limit")) {
-            current.setProcessLimit(((Number) body.get("process_limit")).intValue());
+            current.setProcessLimit(requirePositiveInt(body.get("process_limit"), "process_limit"));
         }
         mapper.updateConfig(current);
     }
 
+    /** #275 — 양의 정수 가드. 비숫자/0/음수는 400. */
+    private static int requirePositiveInt(Object raw, String field) {
+        if (!(raw instanceof Number n)) {
+            throw new ResponseStatusException(HttpStatus.BAD_REQUEST, field + "은(는) 정수여야 합니다");
+        }
+        int v = n.intValue();
+        if (v < 1) {
+            throw new ResponseStatusException(HttpStatus.BAD_REQUEST, field + "은(는) 1 이상이어야 합니다 (폭주 방지)");
+        }
+        return v;
+    }
+
     public void updateLastScan() {
         mapper.updateLastScan();
     }

backend-java/src/main/java/com/tasteby/service/DaemonScheduler.java

@@ -50,8 +50,13 @@ public class DaemonScheduler {
                 Instant lastScan = config.getLastScanAt() != null ? config.getLastScanAt().toInstant() : null;
                 if (lastScan == null || Instant.now().isAfter(lastScan.plus(config.getScanIntervalMin(), ChronoUnit.MINUTES))) {
                     log.info("Running scheduled channel scan...");
-                    int newVideos = youTubeService.scanAllChannels();
+                    int newVideos = 0;
+                    try {
+                        newVideos = youTubeService.scanAllChannels();
+                    } finally {
+                        // #275 — 외부 호출 예외 시에도 last_scan_at을 갱신해 다음 cron까지의 backoff를 보장
                         daemonConfigService.updateLastScan();
+                    }
                     if (newVideos > 0) {
                         cacheService.flush();
                         log.info("Scan completed: {} new videos", newVideos);
@@ -63,8 +68,12 @@ public class DaemonScheduler {
                 Instant lastProcess = config.getLastProcessAt() != null ? config.getLastProcessAt().toInstant() : null;
                 if (lastProcess == null || Instant.now().isAfter(lastProcess.plus(config.getProcessIntervalMin(), ChronoUnit.MINUTES))) {
                     log.info("Running scheduled video processing (limit={})...", config.getProcessLimit());
-                    int restaurants = pipelineService.processPending(config.getProcessLimit());
+                    int restaurants = 0;
+                    try {
+                        restaurants = pipelineService.processPending(config.getProcessLimit());
+                    } finally {
                         daemonConfigService.updateLastProcess();
+                    }
                     if (restaurants > 0) {
                         cacheService.flush();
                         log.info("Processing completed: {} restaurants extracted", restaurants);

backend-java/src/main/java/com/tasteby/service/StatsService.java

@@ -2,11 +2,16 @@ package com.tasteby.service;
 
 import com.tasteby.domain.SiteVisitStats;
 import com.tasteby.mapper.StatsMapper;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.dao.DataIntegrityViolationException;
 import org.springframework.stereotype.Service;
 
 @Service
 public class StatsService {
 
+    private static final Logger log = LoggerFactory.getLogger(StatsService.class);
+
     private final StatsMapper mapper;
 
     public StatsService(StatsMapper mapper) {
@@ -14,7 +19,19 @@ public class StatsService {
     }
 
     public void recordVisit() {
+        // #274 — 자정 경계 동시성: 두 트랜잭션이 동시에 'NOT MATCHED' 판정 → 둘 다 INSERT
+        // → PK/UNIQUE 충돌 시 한 쪽 500. 1회 재시도(다음엔 MATCHED → UPDATE 분기).
+        try {
             mapper.recordVisit();
+        } catch (DataIntegrityViolationException e) {
+            log.debug("recordVisit conflict (midnight race), retry once: {}", e.getMessage());
+            try {
+                mapper.recordVisit();
+            } catch (DataIntegrityViolationException retryFail) {
+                // 두 번째 시도도 실패: 카운트 1건 손실은 수용 (운영 영향 미미)
+                log.warn("recordVisit double-conflict, dropping one count: {}", retryFail.getMessage());
+            }
+        }
     }
 
     public SiteVisitStats getVisits() {

frontend/src/components/LoginMenu.tsx

@@ -1,8 +1,9 @@
 "use client";
 
-import { useState } from "react";
+import { useRef, useState } from "react";
 import { createPortal } from "react-dom";
 import { GoogleLogin } from "@react-oauth/google";
+import { useEscapeKey, useFocusTrap, useBodyScrollLock } from "@/lib/hooks/useModalA11y";
 
 interface LoginMenuProps {
   onGoogleSuccess: (credential: string) => void;
@@ -10,6 +11,22 @@ interface LoginMenuProps {
 
 export default function LoginMenu({ onGoogleSuccess }: LoginMenuProps) {
   const [open, setOpen] = useState(false);
+  const [errorMsg, setErrorMsg] = useState<string | null>(null);
+  const dialogRef = useRef<HTMLDivElement>(null);
+  const titleId = "login-dialog-title";
+
+  // #283 — 모달 접근성: ESC / focus trap / body scroll lock
+  useEscapeKey(open, () => setOpen(false));
+  useFocusTrap(open, dialogRef);
+  useBodyScrollLock(open);
+
+  const handleSuccess = (res: { credential?: string }) => {
+    setErrorMsg(null);
+    if (res.credential) {
+      onGoogleSuccess(res.credential);
+      setOpen(false);
+    }
+  };
 
   return (
     <>
@@ -26,26 +43,34 @@ export default function LoginMenu({ onGoogleSuccess }: LoginMenuProps) {
           style={{ zIndex: 99999 }}
           onClick={(e) => { if (e.target === e.currentTarget) setOpen(false); }}
         >
-          <div className="bg-surface rounded-2xl shadow-2xl p-6 mx-4 w-full max-w-xs space-y-4">
+          <div
+            ref={dialogRef}
+            role="dialog"
+            aria-modal="true"
+            aria-labelledby={titleId}
+            tabIndex={-1}
+            className="bg-surface rounded-2xl shadow-2xl p-6 mx-4 w-full max-w-sm space-y-4"
+          >
             <div className="flex items-center justify-between">
-              <h3 className="text-base font-semibold dark:text-gray-100">로그인</h3>
+              <h3 id={titleId} className="text-base font-semibold dark:text-gray-100">로그인</h3>
               <button
                 onClick={() => setOpen(false)}
-                className="text-gray-400 hover:text-gray-600 dark:hover:text-gray-200 text-lg leading-none"
+                aria-label="로그인 창 닫기"
+                className="text-gray-400 hover:text-gray-600 dark:hover:text-gray-200 text-lg leading-none p-2 -m-2"
               >
                 ✕
               </button>
             </div>
             <p className="text-xs text-gray-400 dark:text-gray-500">소셜 계정으로 간편 로그인</p>
+            {errorMsg && (
+              <p role="alert" className="text-xs text-red-600 dark:text-red-400 bg-red-50 dark:bg-red-950/40 rounded p-2">
+                {errorMsg}
+              </p>
+            )}
             <div className="flex flex-col items-center gap-3">
               <GoogleLogin
-                onSuccess={(res) => {
-                  if (res.credential) {
-                    onGoogleSuccess(res.credential);
-                    setOpen(false);
-                  }
-                }}
-                onError={() => console.error("Google login failed")}
+                onSuccess={handleSuccess}
+                onError={() => setErrorMsg("Google 로그인에 실패했습니다. 팝업 차단 또는 네트워크 상태를 확인해주세요.")}
                 size="large"
                 width="260"
                 text="signin_with"

frontend/src/components/MapView.tsx

@@ -67,8 +67,7 @@ type RestaurantProps = { restaurant: Restaurant };
 type RestaurantFeature = Supercluster.PointFeature<RestaurantProps>;
 
 function useSupercluster(restaurants: Restaurant[]) {
-  const indexRef = useRef<Supercluster<{ restaurant: Restaurant }> | null>(null);
-
+  // #278 — indexRef 제거 (set만 되고 read 없는 dead code)
   const points: RestaurantFeature[] = useMemo(
     () =>
       restaurants.map((r) => ({
@@ -86,7 +85,6 @@ function useSupercluster(restaurants: Restaurant[]) {
       minPoints: 2,
     });
     sc.load(points);
-    indexRef.current = sc;
     return sc;
   }, [points]);
 
@@ -129,12 +127,7 @@ function MapContent({ restaurants, selected, onSelectRestaurant, flyTo, activeCh
   const channelColors = useMemo(() => getChannelColorMap(restaurants), [restaurants]);
   const { getClusters, getExpansionZoom } = useSupercluster(restaurants);
 
-  // Build a lookup for restaurants by id
-  const restaurantMap = useMemo(() => {
-    const m: Record<string, Restaurant> = {};
-    restaurants.forEach((r) => { m[r.id] = r; });
-    return m;
-  }, [restaurants]);
+  // #278 — restaurantMap 제거 (빌드만 되고 렌더에서 사용 안 됨, dead code)
 
   const clusters = useMemo(() => {
     if (!bounds) return [];
@@ -273,7 +266,7 @@ function MapContent({ restaurants, selected, onSelectRestaurant, flyTo, activeCh
                   textDecoration: isClosed ? "line-through" : "none",
                 }}
               >
-                <span className="material-symbols-rounded" style={{ fontSize: 14, marginRight: 3, verticalAlign: "middle", color: "#E8720C" }}>{getCuisineIcon(r.cuisine_type)}</span>
+                <span className="material-symbols-rounded" style={{ fontSize: 14, width: 14, height: 14, overflow: "hidden", display: "inline-flex", alignItems: "center", justifyContent: "center", marginRight: 3, verticalAlign: "middle", color: "#E8720C" }}>{getCuisineIcon(r.cuisine_type)}</span>
                 {r.name}
               </div>
               <div
@@ -298,7 +291,7 @@ function MapContent({ restaurants, selected, onSelectRestaurant, flyTo, activeCh
         >
           <div style={{ backgroundColor: "#ffffff", color: "#171717", colorScheme: "light" }} className="max-w-xs p-1">
             <div className="flex items-center gap-2">
-              <h3 className="font-bold text-base" style={{ color: "#171717" }}><span className="material-symbols-rounded" style={{ fontSize: 18, verticalAlign: "middle", color: "#E8720C", marginRight: 4 }}>{getCuisineIcon(infoTarget.cuisine_type)}</span>{infoTarget.name}</h3>
+              <h3 className="font-bold text-base" style={{ color: "#171717" }}><span className="material-symbols-rounded" style={{ fontSize: 18, width: 18, height: 18, overflow: "hidden", display: "inline-flex", alignItems: "center", justifyContent: "center", verticalAlign: "middle", color: "#E8720C", marginRight: 4 }}>{getCuisineIcon(infoTarget.cuisine_type)}</span>{infoTarget.name}</h3>
               {infoTarget.business_status === "CLOSED_PERMANENTLY" && (
                 <span className="px-1.5 py-0.5 bg-red-100 text-red-700 rounded text-[10px] font-semibold">폐업</span>
               )}
@@ -357,6 +350,13 @@ export default function MapView({ restaurants, selected, onSelectRestaurant, onB
     }, 150);
   }, [onBoundsChanged]);
 
+  // #278 — 언마운트 시 디바운스 타이머 정리 (메모리 누수 + unmounted setState 경고 방지)
+  useEffect(() => {
+    return () => {
+      if (boundsTimerRef.current) clearTimeout(boundsTimerRef.current);
+    };
+  }, []);
+
   return (
     <APIProvider apiKey={API_KEY}>
       <Map
@@ -380,10 +380,12 @@ export default function MapView({ restaurants, selected, onSelectRestaurant, onB
       {onMyLocation && (
         <button
           onClick={onMyLocation}
-          className="absolute top-2 right-2 w-9 h-9 bg-surface rounded-lg shadow-md flex items-center justify-center text-gray-600 dark:text-gray-300 hover:text-brand-500 dark:hover:text-brand-400 transition-colors z-10"
+          aria-label="내 위치로 이동"
+          // #278 — 44×44px 터치 영역 확보 (이전 36px)
+          className="absolute top-2 right-2 w-11 h-11 bg-surface rounded-lg shadow-md flex items-center justify-center text-gray-600 dark:text-gray-300 hover:text-brand-500 dark:hover:text-brand-400 transition-colors z-10 touch-manipulation"
           title="내 위치"
         >
-          <Icon name="my_location" size={20} />
+          <Icon name="my_location" size={22} />
         </button>
       )}
       {channelNames.length > 0 && (

frontend/src/components/MemoSection.tsx

@@ -5,11 +5,13 @@ import { api } from "@/lib/api";
 import type { Memo } from "@/lib/api";
 import { useAuth } from "@/lib/auth-context";
 import Icon from "@/components/Icon";
+import Stars from "@/components/Stars";
 
 interface MemoSectionProps {
   restaurantId: string;
 }
 
+// #281 — ReviewSection의 StarSelector와 동일 UX (0.5 단위 + 44px 터치 + ARIA radiogroup)
 function StarSelector({
   value,
   onChange,
@@ -18,38 +20,32 @@ function StarSelector({
   onChange: (v: number) => void;
 }) {
   return (
-    <div className="flex items-center gap-1">
+    <div role="radiogroup" aria-label="별점 선택" className="flex items-center gap-0.5">
       <span className="text-xs text-gray-500 mr-1">별점:</span>
-      {[0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5].map((v) => (
+      {[1, 2, 3, 4, 5].map((v) => {
+        const nextVal = value === v ? v - 0.5 : v;
+        return (
           <button
             key={v}
             type="button"
-          onClick={() => onChange(v)}
-          className={`w-6 h-6 text-xs rounded border ${
-            value === v
-              ? "bg-yellow-500 text-white border-yellow-600"
-              : "bg-white text-gray-600 border-gray-300 hover:border-yellow-400"
-          }`}
+            role="radio"
+            aria-checked={value >= v - 0.5 && value <= v}
+            aria-label={`${nextVal}점`}
+            onClick={() => onChange(nextVal)}
+            className="min-w-[44px] min-h-[44px] flex items-center justify-center touch-manipulation"
+            title={`${nextVal}점`}
           >
-          {v}
+            <span className={`text-xl ${v <= value ? "text-yellow-500" : v - 0.5 === value ? "text-yellow-400" : "text-gray-300"}`}>
+              {v <= value ? "★" : v - 0.5 === value ? "⯨" : "☆"}
+            </span>
           </button>
-      ))}
+        );
+      })}
+      {value > 0 && <span className="text-xs text-yellow-600 font-medium ml-1">{value}</span>}
     </div>
   );
 }
 
-function StarDisplay({ rating }: { rating: number }) {
-  const stars = [];
-  for (let i = 1; i <= 5; i++) {
-    stars.push(
-      <span key={i} className={rating >= i - 0.5 ? "text-yellow-500" : "text-gray-300"}>
-        ★
-      </span>
-    );
-  }
-  return <span className="text-sm">{stars}</span>;
-}
-
 export default function MemoSection({ restaurantId }: MemoSectionProps) {
   const { user } = useAuth();
   const [memo, setMemo] = useState<Memo | null>(null);
@@ -104,6 +100,9 @@ export default function MemoSection({ restaurantId }: MemoSectionProps) {
       setMemo(saved);
       setShowForm(false);
       setEditing(false);
+    } catch (err) {
+      // #281 — 사용자 피드백
+      alert(`메모 저장 실패: ${err instanceof Error ? err.message : String(err)}`);
     } finally {
       setSubmitting(false);
     }
@@ -111,8 +110,12 @@ export default function MemoSection({ restaurantId }: MemoSectionProps) {
 
   const handleDelete = async () => {
     if (!confirm("메모를 삭제하시겠습니까?")) return;
+    try {
       await api.deleteMemo(restaurantId);
       setMemo(null);
+    } catch (err) {
+      alert(`메모 삭제 실패: ${err instanceof Error ? err.message : String(err)}`);
+    }
   };
 
   return (
@@ -167,7 +170,7 @@ export default function MemoSection({ restaurantId }: MemoSectionProps) {
       ) : memo ? (
         <div className="border border-brand-200 rounded-lg p-3 bg-brand-50/30">
           <div className="flex items-center gap-2 mb-1">
-            {memo.rating && <StarDisplay rating={memo.rating} />}
+            {memo.rating && <Stars rating={memo.rating} />}
             {memo.visited_at && (
               <span className="text-xs text-gray-400">방문일: {memo.visited_at}</span>
             )}

frontend/src/components/MyReviewsList.tsx

@@ -3,6 +3,7 @@
 import { useState } from "react";
 import type { Review, Memo } from "@/lib/api";
 import Icon from "@/components/Icon";
+import Stars from "@/components/Stars";
 
 interface MyReview extends Review {
   restaurant_id: string;
@@ -82,9 +83,9 @@ export default function MyReviewsList({
                   <span className="font-semibold text-sm truncate">
                     {r.restaurant_name || "알 수 없는 식당"}
                   </span>
-                  <span className="text-yellow-500 text-sm shrink-0 ml-2">
-                    {"★".repeat(Math.round(r.rating))}
-                    <span className="text-gray-500 ml-1">{r.rating}</span>
+                  <span className="text-sm shrink-0 ml-2 flex items-center gap-1">
+                    <Stars rating={r.rating} />
+                    <span className="text-gray-500">{r.rating}</span>
                   </span>
                 </div>
                 {r.review_text && (
@@ -118,9 +119,9 @@ export default function MyReviewsList({
                     {m.restaurant_name || "알 수 없는 식당"}
                   </span>
                   {m.rating && (
-                    <span className="text-yellow-500 text-sm shrink-0 ml-2">
-                      {"★".repeat(Math.round(m.rating))}
-                      <span className="text-gray-500 ml-1">{m.rating}</span>
+                    <span className="text-sm shrink-0 ml-2 flex items-center gap-1">
+                      <Stars rating={m.rating} />
+                      <span className="text-gray-500">{m.rating}</span>
                     </span>
                   )}
                 </div>

frontend/src/components/ReviewSection.tsx

@@ -4,37 +4,12 @@ import { useCallback, useEffect, useState } from "react";
 import { api } from "@/lib/api";
 import type { Review } from "@/lib/api";
 import { useAuth } from "@/lib/auth-context";
+import Stars from "@/components/Stars";
 
 interface ReviewSectionProps {
   restaurantId: string;
 }
 
-function StarDisplay({ rating }: { rating: number }) {
-  const stars = [];
-  for (let i = 1; i <= 5; i++) {
-    if (rating >= i) {
-      stars.push(
-        <span key={i} className="text-yellow-500">
-          ★
-        </span>
-      );
-    } else if (rating >= i - 0.5) {
-      stars.push(
-        <span key={i} className="text-yellow-500">
-          ★
-        </span>
-      );
-    } else {
-      stars.push(
-        <span key={i} className="text-gray-300">
-          ★
-        </span>
-      );
-    }
-  }
-  return <span className="text-sm">{stars}</span>;
-}
-
 function StarSelector({
   value,
   onChange,
@@ -43,22 +18,30 @@ function StarSelector({
   onChange: (v: number) => void;
 }) {
   return (
-    <div className="flex items-center gap-1">
+    <div role="radiogroup" aria-label="별점 선택" className="flex items-center gap-0.5">
       <span className="text-xs text-gray-500 mr-1">별점:</span>
-      {[0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5].map((v) => (
+      {[1, 2, 3, 4, 5].map((v) => {
+        const isCurrent = value === v || value === v - 0.5;
+        const nextVal = value === v ? v - 0.5 : v;
+        return (
           <button
             key={v}
             type="button"
-          onClick={() => onChange(v)}
-          className={`w-6 h-6 text-xs rounded border ${
-            value === v
-              ? "bg-yellow-500 text-white border-yellow-600"
-              : "bg-white text-gray-600 border-gray-300 hover:border-yellow-400"
-          }`}
+            role="radio"
+            aria-checked={value >= v - 0.5 && value <= v}
+            aria-label={`${nextVal}점`}
+            onClick={() => onChange(nextVal)}
+            // #281 — 최소 터치 영역 44×44
+            className="min-w-[44px] min-h-[44px] flex items-center justify-center touch-manipulation"
+            title={`${nextVal}점`}
           >
-          {v}
+            <span className={`text-xl ${v <= value ? "text-yellow-500" : v - 0.5 === value ? "text-yellow-400" : "text-gray-300"}`}>
+              {v <= value ? "★" : v - 0.5 === value ? "⯨" : "☆"}
+            </span>
           </button>
-      ))}
+        );
+      })}
+      {value > 0 && <span className="text-xs text-yellow-600 font-medium ml-1">{value}</span>}
     </div>
   );
 }
@@ -170,29 +153,42 @@ export default function ReviewSection({ restaurantId }: ReviewSectionProps) {
     ? reviews.find((r) => r.user_id === user.id)
     : null;
 
+  // #281 — API 실패 시 unhandled rejection 방지 + 사용자 피드백
   const handleCreate = async (data: {
     rating: number;
     review_text?: string;
     visited_at?: string;
   }) => {
+    try {
       await api.createReview(restaurantId, data);
       setShowForm(false);
       loadReviews();
+    } catch (e) {
+      alert(`리뷰 작성 실패: ${e instanceof Error ? e.message : String(e)}`);
+    }
   };
 
   const handleUpdate = async (
     reviewId: string,
     data: { rating: number; review_text?: string; visited_at?: string }
   ) => {
+    try {
       await api.updateReview(reviewId, data);
       setEditingId(null);
       loadReviews();
+    } catch (e) {
+      alert(`리뷰 수정 실패: ${e instanceof Error ? e.message : String(e)}`);
+    }
   };
 
   const handleDelete = async (reviewId: string) => {
     if (!confirm("리뷰를 삭제하시겠습니까?")) return;
+    try {
       await api.deleteReview(reviewId);
       loadReviews();
+    } catch (e) {
+      alert(`리뷰 삭제 실패: ${e instanceof Error ? e.message : String(e)}`);
+    }
   };
 
   return (
@@ -216,7 +212,7 @@ export default function ReviewSection({ restaurantId }: ReviewSectionProps) {
         <>
           {reviewCount > 0 && avgRating !== null && (
             <div className="flex items-center gap-2 mb-3 text-sm">
-              <StarDisplay rating={Math.round(avgRating * 2) / 2} />
+              <Stars rating={Math.round(avgRating * 2) / 2} />
               <span className="font-medium">{avgRating.toFixed(1)}</span>
               <span className="text-gray-500">({reviewCount}개)</span>
             </div>
@@ -270,7 +266,7 @@ export default function ReviewSection({ restaurantId }: ReviewSectionProps) {
                         <span className="text-sm font-medium">
                           {review.user_nickname || "익명"}
                         </span>
-                        <StarDisplay rating={review.rating} />
+                        <Stars rating={review.rating} />
                         <span className="text-xs text-gray-400">
                           {new Date(review.created_at).toLocaleDateString(
                             "ko-KR"

frontend/src/components/Stars.tsx

@@ -0,0 +1,37 @@
+// #281 공통 별점 컴포넌트 — ReviewSection/MemoSection/MyReviewsList 재사용.
+// 0.5 단위 시각 구분: 빈 별 위에 황색 절반 별을 절대배치 + clip으로 표시.
+
+interface StarsProps {
+  rating: number; // 0~5, 0.5 단위
+  size?: "sm" | "md";
+  showNumber?: boolean;
+  className?: string;
+}
+
+export default function Stars({ rating, size = "sm", showNumber = false, className = "" }: StarsProps) {
+  const r = Math.max(0, Math.min(5, rating));
+  const textSize = size === "md" ? "text-base" : "text-sm";
+  return (
+    <span className={`inline-flex items-center gap-0.5 ${textSize} ${className}`} aria-label={`${r}점`}>
+      {[1, 2, 3, 4, 5].map((i) => {
+        const full = r >= i;
+        const half = !full && r >= i - 0.5;
+        return (
+          <span key={i} className="relative inline-block leading-none">
+            <span className="text-gray-300">★</span>
+            {(full || half) && (
+              <span
+                aria-hidden="true"
+                className="absolute inset-0 text-yellow-500 overflow-hidden"
+                style={{ width: full ? "100%" : "50%" }}
+              >
+                ★
+              </span>
+            )}
+          </span>
+        );
+      })}
+      {showNumber && r > 0 && <span className="text-xs text-yellow-600 font-medium ml-1">{r}</span>}
+    </span>
+  );
+}