fix: 글 작성자 배경색이 적용되지 않는 오류 해결

Author: tifsy

src/apis/share.ts

@@ -10,8 +10,8 @@ interface ShareLetter {
 
 // 공유 게시글 목록 조회 타입
 export interface SharePost {
-  writerZipCode: number;
-  receiverZipCode: number;
+  writerZipCode: string;
+  receiverZipCode: string;
   content: string;
   createdAt: string;
   active: boolean;

src/pages/LetterBoardDetail/index.tsx

@@ -96,7 +96,7 @@ const LetterBoardDetailPage = ({ confirmDisabled }: ShareLetterPreviewProps) =>
               <Letter
                 key={index}
                 letter={letter}
-                isWriter={letter.writerZipCode === String(postDetail.receiverZipCode)}
+                isWriter={letter.writerZipCode === postDetail.zipCode}
               />
             ))}
           </section>