refactor: email 대신 nickname 출력

src/pages/SharedCombinationPage/SharedCombinationPage.jsx

@@ -60,7 +60,7 @@ const SharedCombinationPage = () => {
       {combination && sharedInfo && (
         <>
           <div className="shared-info">
-            <p>공유자: {sharedInfo.email}</p>
+            <p>공유자: {sharedInfo.nickname}</p>
             <p>등록일: {new Date(sharedInfo.created_at).toLocaleDateString()}</p>
             <p>공유일: {new Date(sharedInfo.verified_at).toLocaleDateString()}</p>
           </div>