Fix toast and sync settings

- Fix issue where toast notifications were not disappearing.
- Ensure sync settings are turned off upon logout.

src/contexts/auth/AuthProvider.tsx

@@ -5,6 +5,7 @@ import { Session, User } from '@supabase/supabase-js';
 import { toast } from '@/hooks/useToast.wrapper';
 import { AuthContextType } from './types';
 import * as authActions from './authActions';
+import { clearAllToasts } from '@/hooks/toast/toastManager';
 
 const AuthContext = createContext<AuthContextType | undefined>(undefined);
 
@@ -45,6 +46,12 @@ export const AuthProvider: React.FC<{ children: React.ReactNode }> = ({ children
         } else if (event === 'SIGNED_OUT') {
           setSession(null);
           setUser(null);
+          
+          // 로그아웃 시 열려있는 모든 토스트 제거
+          clearAllToasts();
+          
+          // 로그아웃 이벤트 발생시켜 SyncSettings 등에서 감지하도록 함
+          window.dispatchEvent(new Event('auth-state-changed'));
         }
         
         setLoading(false);