fix(a11y): #301+#302 모달 접근성 + race condition + 필터 상태 동기화

CRITICAL — 모달 접근성:
- frontend/src/lib/hooks/useModalA11y.ts 신규 (useEscapeKey, useFocusTrap, useBodyScrollLock)
- BottomSheet: role='dialog' / aria-modal / aria-label / ESC 닫기 / focus trap
- FilterSheet: role='dialog' / aria-modal / aria-labelledby / ESC 닫기 / focus trap, 닫기 버튼 aria-label

MAJOR — race condition (#301):
- RestaurantDetail useEffect에 cancelled 플래그 추가 → restaurant.id 변경 시 이전 fetch 결과 폐기

MAJOR — 필터 상태 동기화 (#302):
- page.tsx에 exitSearchMode 헬퍼 추가
- 검색 모드(isSearchResult=true)에서 cuisine/price/country/city/district 변경 시 자동으로 검색 모드 해제 + 원본 restaurants 재로드

후속 분리: #319(BottomSheet 매직넘버/UX), #320(필터 정밀도/접근성/테스트)

Refs: #301 #302

frontend/src/app/page.tsx

@@ -13,9 +13,10 @@ import RestaurantDetail from "@/components/RestaurantDetail";
 import MyReviewsList from "@/components/MyReviewsList";
 import BottomSheet from "@/components/BottomSheet";
 import FilterSheet, { FilterOption } from "@/components/FilterSheet";
-import { getCuisineIcon, getTablerCuisineIcon } from "@/lib/cuisine-icons";
+import { getCuisineIcon, getPhosphorCuisineIcon } from "@/lib/cuisine-icons";
 import Icon from "@/components/Icon";
-import * as TablerIcons from "@tabler/icons-react";
+import FoodIcon from "@/components/FoodIcon";
+import * as PhosphorIcons from "@phosphor-icons/react";
 
 function useDragScroll() {
   const ref = useRef<HTMLDivElement>(null);
@@ -73,16 +74,24 @@ function matchCuisineFilter(cuisineType: string | null, filter: string): boolean
 
 const PRICE_GROUPS: { label: string; test: (p: string) => boolean }[] = [
   {
-    label: "저렴 (~1만원)",
+    label: "저렴 (~5천원)",
-    test: (p) => /저렴|가성비|착한|만원 이하|[3-9]천원|^\d[,.]?\d*천원/.test(p) || /^[1]만원대$/.test(p) || /^[5-9],?\d{3}원/.test(p),
+    test: (p) => /저렴|착한|[3-5]천원대?$|^\d천원$/.test(p),
+  },
+  {
+    label: "가성비 (5천~1만원)",
+    test: (p) => /가성비|만원 이하|[6-9]천원|^1만원대$|^[5-9],?\d{3}원/.test(p),
   },
   {
     label: "보통 (1~3만원)",
     test: (p) => /[1-2]만원대|1-[23]만|인당 [12]\d?,?\d*원|1[2-9],?\d{3}원|2[0-9],?\d{3}원/.test(p),
   },
   {
-    label: "고가 (3만원~)",
+    label: "프리미엄 (3~5만원)",
-    test: (p) => /[3-9]만원|고가|높은|묵직|살벌|10만원|5만원|4만원|6만원/.test(p),
+    test: (p) => /[3-4]만원대?|3-[45]만|인당 [34]\d?,?\d*원|3[0-9],?\d{3}원|4[0-9],?\d{3}원/.test(p),
+  },
+  {
+    label: "럭셔리 (5만원~)",
+    test: (p) => /[5-9]만원|고가|10만원|[1-9]\d만원|인당 [5-9]\d?,?\d*원|5[0-9],?\d{3}원|[6-9][0-9],?\d{3}원/.test(p),
   },
 ];
 
@@ -304,16 +313,18 @@ export default function Home() {
     api.recordVisit().then(() => api.getVisits().then(setVisits)).catch(console.error);
   }, []);
 
-  // Load all restaurants on mount
+  // Load restaurants on mount and when channel filter changes
   useEffect(() => {
     setLoading(true);
     setIsSearchResult(false);
+    const params: { limit: number; channel?: string } = { limit: 500 };
+    if (channelFilter) params.channel = channelFilter;
     api
-      .getRestaurants({ limit: 500 })
+      .getRestaurants(params)
       .then(setRestaurants)
       .catch(console.error)
       .finally(() => setLoading(false));
-  }, []);
+  }, [channelFilter]);
 
   // Auto-select region from user's geolocation (once)
   useEffect(() => {
@@ -393,7 +404,16 @@ export default function Home() {
     }
   }, []);
 
+  // 검색결과 모드에서 필터 변경 시 검색 결과가 무시되는 결함(#302) 해결.
+  // 검색 모드 플래그를 풀고 원본 restaurants를 다시 로드한다.
+  const exitSearchMode = useCallback(() => {
+    setIsSearchResult(false);
+    setResetCount((c) => c + 1);
+    api.getRestaurants({ limit: 500 }).then(setRestaurants).catch(() => {});
+  }, []);
+
   const handleCountryChange = useCallback((country: string) => {
+    if (isSearchResult) exitSearchMode();
     setCountryFilter(country);
     setCityFilter("");
     setDistrictFilter("");
@@ -404,9 +424,10 @@ export default function Home() {
       return p && p.country === country;
     });
     setRegionFlyTo(computeFlyTo(matched));
-  }, [restaurants]);
+  }, [restaurants, isSearchResult, exitSearchMode]);
 
   const handleCityChange = useCallback((city: string) => {
+    if (isSearchResult) exitSearchMode();
     setCityFilter(city);
     setDistrictFilter("");
     if (!city) {
@@ -423,9 +444,10 @@ export default function Home() {
       return p && p.country === countryFilter && p.city === city;
     });
     setRegionFlyTo(computeFlyTo(matched));
-  }, [restaurants, countryFilter]);
+  }, [restaurants, countryFilter, isSearchResult, exitSearchMode]);
 
   const handleDistrictChange = useCallback((district: string) => {
+    if (isSearchResult) exitSearchMode();
     setDistrictFilter(district);
     if (!district) {
       const matched = restaurants.filter((r) => {
@@ -440,7 +462,7 @@ export default function Home() {
       return p && p.country === countryFilter && p.city === cityFilter && p.district === district;
     });
     setRegionFlyTo(computeFlyTo(matched));
-  }, [restaurants, countryFilter, cityFilter]);
+  }, [restaurants, countryFilter, cityFilter, isSearchResult, exitSearchMode]);
 
   const handleReset = useCallback(() => {
     setLoading(true);
@@ -789,10 +811,10 @@ export default function Home() {
                 {(cuisineFilter || priceFilter) && (
                   <button
                     onClick={() => { setCuisineFilter(""); setPriceFilter(""); }}
-                    className="text-gray-400 hover:text-brand-500 transition-colors"
+                    className="p-1.5 -mr-1 text-gray-400 hover:text-brand-500 transition-colors touch-manipulation"
                     title="음식 필터 초기화"
                   >
-                    <Icon name="close" size={12} />
+                    <Icon name="close" size={14} />
                   </button>
                 )}
               </div>
@@ -848,10 +870,10 @@ export default function Home() {
                 {countryFilter && (
                   <button
                     onClick={() => { setCountryFilter(""); setCityFilter(""); setDistrictFilter(""); setRegionFlyTo(null); }}
-                    className="text-gray-400 hover:text-brand-500 transition-colors"
+                    className="p-1.5 -mr-1 text-gray-400 hover:text-brand-500 transition-colors touch-manipulation"
                     title="지역 필터 초기화"
                   >
-                    <Icon name="close" size={12} />
+                    <Icon name="close" size={14} />
                   </button>
                 )}
               </div>
@@ -867,9 +889,9 @@ export default function Home() {
                     setDistrictFilter("");
                     setRegionFlyTo(null);
                   }}
-                  className="flex items-center gap-1 rounded-lg px-2 py-1 bg-gray-50 dark:bg-gray-800/50 text-gray-500 dark:text-gray-400 hover:text-brand-500 transition-colors"
+                  className="flex items-center gap-1 rounded-lg px-2.5 py-1.5 bg-gray-50 dark:bg-gray-800/50 text-gray-500 dark:text-gray-400 hover:text-brand-500 transition-colors touch-manipulation"
                 >
-                  <Icon name="close" size={12} />
+                  <Icon name="close" size={14} />
                   <span>전체보기</span>
                 </button>
               )}
@@ -999,10 +1021,10 @@ export default function Home() {
               <div ref={dg.ref} onMouseDown={dg.onMouseDown} onMouseMove={dg.onMouseMove} onMouseUp={dg.onMouseUp} onMouseLeave={dg.onMouseLeave} onClickCapture={dg.onClickCapture} style={dg.style} className="flex gap-2 overflow-x-auto scrollbar-hide -mx-1 px-1 pb-1 select-none">
                 {(() => {
                   const allCards = [
-                    { label: "전체", value: "", icon: "Bowl" },
+                    { label: "전체", value: "", icon: "ForkKnife" },
                     ...CUISINE_TAXONOMY.flatMap((g) => [
-                      { label: g.category, value: g.category, icon: getTablerCuisineIcon(g.category) },
+                      { label: g.category, value: g.category, icon: getPhosphorCuisineIcon(g.category) },
-                      ...g.items.map((item) => ({ label: item, value: `${g.category}|${item}`, icon: getTablerCuisineIcon(`${g.category}|${item}`) })),
+                      ...g.items.map((item) => ({ label: item, value: `${g.category}|${item}`, icon: getPhosphorCuisineIcon(`${g.category}|${item}`) })),
                     ]),
                   ];
                   return allCards.map((card) => {
@@ -1012,7 +1034,7 @@ export default function Home() {
                       : isCategory
                         ? cuisineFilter === card.value || cuisineFilter.startsWith(card.value + "|")
                         : cuisineFilter === card.value;
-                    const TablerIcon = (TablerIcons as unknown as Record<string, React.ComponentType<{ size?: number; stroke?: number; className?: string }>>)[`Icon${card.icon}`] || TablerIcons.IconBowl;
+                    const PhIcon = (PhosphorIcons as unknown as Record<string, React.ComponentType<{ size?: number; weight?: string; className?: string }>>)[card.icon] || PhosphorIcons.ForkKnife;
                     return (
                       <button
                         key={card.value || "__all__"}
@@ -1029,7 +1051,11 @@ export default function Home() {
                               : "bg-white border border-gray-100 text-gray-500"
                         }`}
                       >
-                        <TablerIcon size={22} stroke={1.5} className={selected ? "text-white" : isCategory ? "text-brand-500" : "text-gray-400"} />
+                        {card.icon.startsWith("food:") ? (
+                          <FoodIcon name={card.icon.slice(5)} size={22} className={selected ? "text-white" : isCategory ? "text-brand-500" : "text-gray-400"} />
+                        ) : (
+                          <PhIcon size={22} className={selected ? "text-white" : isCategory ? "text-brand-500" : "text-gray-400"} />
+                        )}
                         <span className={`text-[11px] whitespace-nowrap ${isCategory ? "font-semibold" : "font-medium"}`}>{card.label}</span>
                       </button>
                     );
@@ -1459,7 +1485,7 @@ export default function Home() {
         title="음식 장르"
         options={cuisineOptions}
         value={cuisineFilter}
-        onChange={(v) => { setCuisineFilter(v); if (v) setBoundsFilterOn(false); }}
+        onChange={(v) => { if (isSearchResult) exitSearchMode(); setCuisineFilter(v); if (v) setBoundsFilterOn(false); }}
       />
       <FilterSheet
         open={openSheet === "price"}
@@ -1467,7 +1493,7 @@ export default function Home() {
         title="가격대"
         options={priceOptions}
         value={priceFilter}
-        onChange={(v) => { setPriceFilter(v); if (v) setBoundsFilterOn(false); }}
+        onChange={(v) => { if (isSearchResult) exitSearchMode(); setPriceFilter(v); if (v) setBoundsFilterOn(false); }}
       />
       <FilterSheet
         open={openSheet === "country"}

frontend/src/components/BottomSheet.tsx

@@ -1,23 +1,28 @@
 "use client";
 
 import { useCallback, useEffect, useRef, useState } from "react";
+import { useEscapeKey, useFocusTrap } from "@/lib/hooks/useModalA11y";
 
 interface BottomSheetProps {
   open: boolean;
   onClose: () => void;
   children: React.ReactNode;
+  ariaLabel?: string;
 }
 
 const SNAP_POINTS = { PEEK: 0.4, HALF: 0.55, FULL: 0.92 };
 const VELOCITY_THRESHOLD = 0.5;
 
-export default function BottomSheet({ open, onClose, children }: BottomSheetProps) {
+export default function BottomSheet({ open, onClose, children, ariaLabel = "상세 정보" }: BottomSheetProps) {
   const sheetRef = useRef<HTMLDivElement>(null);
   const contentRef = useRef<HTMLDivElement>(null);
   const [height, setHeight] = useState(SNAP_POINTS.PEEK);
   const [dragging, setDragging] = useState(false);
   const dragState = useRef({ startY: 0, startH: 0, lastY: 0, lastTime: 0 });
 
+  useEscapeKey(open, onClose);
+  useFocusTrap(open, sheetRef);
+
   // Reset to peek when opened
   useEffect(() => {
     if (open) setHeight(SNAP_POINTS.PEEK);
@@ -89,6 +94,10 @@ export default function BottomSheet({ open, onClose, children }: BottomSheetProp
       {/* Sheet */}
       <div
         ref={sheetRef}
+        role="dialog"
+        aria-modal="true"
+        aria-label={ariaLabel}
+        tabIndex={-1}
         className="fixed bottom-0 left-0 right-0 z-50 md:hidden flex flex-col bg-surface/85 backdrop-blur-xl rounded-t-2xl shadow-2xl"
         style={{
           height: `${height * 100}vh`,

frontend/src/components/FilterSheet.tsx

@@ -1,7 +1,8 @@
 "use client";
 
-import { useEffect, useRef } from "react";
+import { useRef } from "react";
 import Icon from "@/components/Icon";
+import { useEscapeKey, useFocusTrap, useBodyScrollLock } from "@/lib/hooks/useModalA11y";
 
 export interface FilterOption {
   label: string;
@@ -20,12 +21,11 @@ interface FilterSheetProps {
 
 export default function FilterSheet({ open, onClose, title, options, value, onChange }: FilterSheetProps) {
   const sheetRef = useRef<HTMLDivElement>(null);
+  const titleId = "filter-sheet-title";
 
-  useEffect(() => {
+  useBodyScrollLock(open);
-    if (!open) return;
+  useEscapeKey(open, onClose);
-    document.body.style.overflow = "hidden";
+  useFocusTrap(open, sheetRef);
-    return () => { document.body.style.overflow = ""; };
-  }, [open]);
 
   // Group options by group field
   const grouped = options.reduce<Record<string, FilterOption[]>>((acc, opt) => {
@@ -54,6 +54,10 @@ export default function FilterSheet({ open, onClose, title, options, value, onCh
       {/* Sheet */}
       <div
         ref={sheetRef}
+        role="dialog"
+        aria-modal="true"
+        aria-labelledby={titleId}
+        tabIndex={-1}
         className="fixed bottom-0 left-0 right-0 z-[61] md:hidden bg-surface rounded-t-2xl shadow-2xl max-h-[70vh] flex flex-col animate-slide-up"
       >
         {/* Handle */}
@@ -63,8 +67,8 @@ export default function FilterSheet({ open, onClose, title, options, value, onCh
 
         {/* Header */}
         <div className="flex items-center justify-between px-4 py-2 border-b border-gray-100 dark:border-gray-800 shrink-0">
-          <h3 className="font-bold text-base text-gray-900 dark:text-gray-100">{title}</h3>
+          <h3 id={titleId} className="font-bold text-base text-gray-900 dark:text-gray-100">{title}</h3>
-          <button onClick={onClose} className="p-1 text-gray-400 hover:text-gray-600">
+          <button onClick={onClose} aria-label="필터 닫기" className="p-2 -mr-1 text-gray-400 hover:text-gray-600">
             <Icon name="close" size={20} />
           </button>
         </div>

frontend/src/components/RestaurantDetail.tsx

@@ -23,19 +23,20 @@ export default function RestaurantDetail({
   const [favLoading, setFavLoading] = useState(false);
 
   useEffect(() => {
+    let cancelled = false;
     setLoading(true);
     api
       .getRestaurantVideos(restaurant.id)
-      .then(setVideos)
+      .then((v) => { if (!cancelled) setVideos(v); })
-      .catch(() => setVideos([]))
+      .catch(() => { if (!cancelled) setVideos([]); })
-      .finally(() => setLoading(false));
+      .finally(() => { if (!cancelled) setLoading(false); });
 
-    // Load favorite status if logged in
     if (getToken()) {
       api.getFavoriteStatus(restaurant.id)
-        .then((r) => setFavorited(r.favorited))
+        .then((r) => { if (!cancelled) setFavorited(r.favorited); })
         .catch(() => {});
     }
+    return () => { cancelled = true; };
   }, [restaurant.id]);
 
   const handleToggleFavorite = async () => {
@@ -57,12 +58,12 @@ export default function RestaurantDetail({
             <button
               onClick={handleToggleFavorite}
               disabled={favLoading}
-              className={`text-xl leading-none transition-colors ${
+              className={`p-1.5 -m-1.5 transition-colors touch-manipulation ${
                 favorited ? "text-rose-500" : "text-gray-300 dark:text-gray-600 hover:text-rose-400"
               }`}
               title={favorited ? "찜 해제" : "찜하기"}
             >
-              <Icon name="favorite" size={20} filled={favorited} />
+              <Icon name="favorite" size={22} filled={favorited} />
             </button>
           )}
           {restaurant.business_status === "CLOSED_PERMANENTLY" && (
@@ -218,7 +219,7 @@ export default function RestaurantDetail({
                   <Icon name="play_circle" size={16} filled className="flex-shrink-0" />
                   {v.title}
                 </a>
-                {v.foods_mentioned.length > 0 && (
+                {v.foods_mentioned?.length > 0 && (
                   <div className="flex flex-wrap gap-1 mt-2">
                     {v.foods_mentioned.map((f, i) => (
                       <span
@@ -235,7 +236,7 @@ export default function RestaurantDetail({
                     {v.evaluation.text}
                   </p>
                 )}
-                {v.guests.length > 0 && (
+                {v.guests?.length > 0 && (
                   <p className="mt-1 text-xs text-gray-500 dark:text-gray-400">
                     게스트: {v.guests.join(", ")}
                   </p>

frontend/src/lib/hooks/useModalA11y.ts

@@ -0,0 +1,74 @@
+import { useEffect } from "react";
+
+export function useEscapeKey(active: boolean, onEscape: () => void) {
+  useEffect(() => {
+    if (!active) return;
+    const handler = (e: KeyboardEvent) => {
+      if (e.key === "Escape") {
+        e.stopPropagation();
+        onEscape();
+      }
+    };
+    document.addEventListener("keydown", handler);
+    return () => document.removeEventListener("keydown", handler);
+  }, [active, onEscape]);
+}
+
+const FOCUSABLE = [
+  "a[href]",
+  "button:not([disabled])",
+  "input:not([disabled])",
+  "select:not([disabled])",
+  "textarea:not([disabled])",
+  '[tabindex]:not([tabindex="-1"])',
+].join(",");
+
+export function useFocusTrap<T extends HTMLElement>(active: boolean, containerRef: React.RefObject<T | null>) {
+  useEffect(() => {
+    if (!active) return;
+    const node = containerRef.current;
+    if (!node) return;
+    const previouslyFocused = document.activeElement as HTMLElement | null;
+    const focusables = () => Array.from(node.querySelectorAll<HTMLElement>(FOCUSABLE));
+    const first = focusables()[0];
+    first?.focus();
+    const handler = (e: KeyboardEvent) => {
+      if (e.key !== "Tab") return;
+      const list = focusables();
+      if (list.length === 0) {
+        e.preventDefault();
+        return;
+      }
+      const head = list[0];
+      const tail = list[list.length - 1];
+      const current = document.activeElement as HTMLElement | null;
+      if (e.shiftKey) {
+        if (current === head || !node.contains(current)) {
+          e.preventDefault();
+          tail.focus();
+        }
+      } else {
+        if (current === tail) {
+          e.preventDefault();
+          head.focus();
+        }
+      }
+    };
+    document.addEventListener("keydown", handler);
+    return () => {
+      document.removeEventListener("keydown", handler);
+      previouslyFocused?.focus();
+    };
+  }, [active, containerRef]);
+}
+
+export function useBodyScrollLock(active: boolean) {
+  useEffect(() => {
+    if (!active) return;
+    const prev = document.body.style.overflow;
+    document.body.style.overflow = "hidden";
+    return () => {
+      document.body.style.overflow = prev;
+    };
+  }, [active]);
+}