fix: QA 반영

- 내 편지함 상세 다크모드 툴팁 글씨 안보이는 문제 해결
- 롤링페이퍼 메뉴버튼 두개 해결

Author: nirii00

src/pages/LetterBoxDetail/components/InformationTooltip.tsx

@@ -24,7 +24,7 @@ const InformationTooltip = () => {
       </button>
       <article
         className={twMerge(
-          'absolute top-6 -right-1 z-20 w-75 rounded-md bg-white p-4 drop-shadow-sm transition-opacity duration-200',
+          'absolute top-6 -right-1 z-20 w-75 rounded-md bg-white p-4 drop-shadow-sm transition-opacity duration-200 dark:text-black',
           isShow ? 'opacity-100' : 'pointer-events-none opacity-0',
         )}
       >

src/pages/RollingPaper/index.tsx

@@ -133,7 +133,6 @@ const RollingPaperPage = () => {
         <WriteCommentButton rollingPaperId={id} />
         <MenuButton />
       </main>
-      <MenuButton />
       <BackgroundBottom />
     </>
   );