fix: 로딩 무한 루프 및 알림 카운트 null 오류 수정

Author: mmjjaa

src/AuthProvider.tsx

@@ -14,6 +14,7 @@ export const AuthProvider = ({ children }: AuthLayoutProps) => {
         const initializeAuth = async () => {
             const accessToken = tokenStorage.getAccessToken();
             if (accessToken === null) {
+                setIsLoading(false);
                 return;
             }
             const success = await handleGetUserInfo();

src/components/HomePage/TopButtonContainer/TopButtonContainer.tsx

@@ -12,7 +12,7 @@ export const TopButtonContainer = () => {
     if (isLoading || isError || !data) {
         unreadNotifications = 0;
     } else {
-        unreadNotifications = data?.result.count;
+        unreadNotifications = data?.result?.count ?? 0;
     }
 
     return (