[Fix] 커피챗/쪽지 보내기 기능 오류 & 커피챗 오픈 여부 확인 수정

src/main/java/org/sopt/makers/internal/coffeechat/repository/CoffeeChatRepository.java

@@ -11,6 +11,7 @@ public interface CoffeeChatRepository extends JpaRepository<CoffeeChat, Long>, C
 
     // READ
     Boolean existsCoffeeChatByMember(Member member);
+    Boolean existsCoffeeChatByMemberAndIsCoffeeChatActivate(Member member, Boolean isCoffeeChatActivate);
     Optional<CoffeeChat> findCoffeeChatByMember(Member member);
 
     // UPDATE

src/main/java/org/sopt/makers/internal/coffeechat/service/CoffeeChatRetriever.java

@@ -41,7 +41,7 @@ public void checkAlreadyExistCoffeeChat(Member member) {
     }
 
     public boolean existsCoffeeChat(Member member) {
-        return coffeeChatRepository.existsCoffeeChatByMember(member);
+        return coffeeChatRepository.existsCoffeeChatByMemberAndIsCoffeeChatActivate(member, true);
     }
 
     public CoffeeChat findCoffeeChatAndCheckIsActivated(Member member, Boolean isMine) {

src/main/java/org/sopt/makers/internal/coffeechat/service/CoffeeChatService.java

@@ -68,7 +68,7 @@ public class CoffeeChatService {
     @Transactional
     public void sendCoffeeChatRequest(CoffeeChatRequest request, Long senderId) {
         InternalUserDetails senderUserDetails = platformService.getInternalUser(senderId);
-        InternalUserDetails receiverUserDetails = platformService.getInternalUser(senderId);
+        InternalUserDetails receiverUserDetails = platformService.getInternalUser(request.receiverId());
         String replyInfo = getReplyInfo(request, senderUserDetails);
 
         MessageSender senderStrategy = messageSenderFactory.getSender(request.senderEmail(), request.senderPhone());