추세검색 설정 수정

frontend/src/hooks/useAppSettings.ts

@@ -49,6 +49,22 @@ import {
 // 전역 캐시 — 여러 컴포넌트에서 공유하여 중복 요청 방지
 let _cache: AppSettingsDto | null = null;
 let _loadPromise: Promise<AppSettingsDto> | null = null;
+type AppSettingsListener = () => void;
+const _listeners = new Set<AppSettingsListener>();
+
+function notifyAppSettingsListeners() {
+  _listeners.forEach(fn => fn());
+}
+
+/** 훅 외부에서 최신 캐시 읽기 (추세검색 설정 병합 등) */
+export function getAppSettingsCache(): AppSettingsDto {
+  return _cache ?? {};
+}
+
+export function subscribeAppSettings(listener: AppSettingsListener): () => void {
+  _listeners.add(listener);
+  return () => _listeners.delete(listener);
+}
 
 function ensureLoaded(): Promise<AppSettingsDto> {
   if (_cache !== null) return Promise.resolve(_cache);
@@ -56,6 +72,7 @@ function ensureLoaded(): Promise<AppSettingsDto> {
   _loadPromise = loadAppSettings().then(data => {
     _cache = data ?? {};
     _loadPromise = null;
+    notifyAppSettingsListeners();
     return _cache;
   });
   return _loadPromise;
@@ -141,7 +158,13 @@ export function useAppSettings(sessionKey = 0) {
       console.error('[useAppSettings] load failed', err);
       if (mountedRef.current) setIsLoaded(true);
     });
-    return () => { mountedRef.current = false; };
+    const unsub = subscribeAppSettings(() => {
+      if (mountedRef.current) setSettings({ ...(getAppSettingsCache()) });
+    });
+    return () => {
+      mountedRef.current = false;
+      unsub();
+    };
   }, [sessionKey]);
 
   /**
@@ -151,14 +174,18 @@ export function useAppSettings(sessionKey = 0) {
   const save = useCallback((patch: AppSettingsDto) => {
     const merged = { ...(_cache ?? {}), ...patch };
     _cache = merged;
+    notifyAppSettingsListeners();
     setSettings(merged);
     if (patch.displayTimezone != null) {
       setDisplayTimezone(normalizeTimezone(patch.displayTimezone));
     }
     saveAppSettings(patch).then(updated => {
-      if (updated && mountedRef.current) {
+      if (updated) {
         _cache = { ...(_cache ?? {}), ...updated };
-        setSettings(prev => ({ ...prev, ...updated }));
+        notifyAppSettingsListeners();
+        if (mountedRef.current) {
+          setSettings(prev => ({ ...prev, ...updated }));
+        }
       }
     }).catch(err =>
       console.error('[useAppSettings] save failed', err)