fix: 투표 취소 후 채팅 메시지 senderVoteOption null 반환

[tlarbals824]

Summary

투표 참여를 취소한 사용자의 기존 채팅 메시지에서 senderVoteOption이 더 이상 A/B로 내려가지 않고 null로 반환됩니다.

Changes

• VoteQueryUseCase.findSelectedOptionCode() 추가 — 현재 참여 상태가 없으면 empty
• ChatService 메시지 조회/전송, ChatMessageEventListener WebSocket 브로드캐스트에서 위 API 사용

Test plan

• ChatServiceTest, ChatMessageEventListenerTest 통과
• 투표 → 채팅 전송 → 동일 옵션 재클릭(취소) → 메시지 목록 재조회 시 본인 메시지 senderVoteOption: null 확인

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: e0e84d5f-9dc2-41b6-a8d6-107033036906

📥 Commits

Reviewing files that changed from the base of the PR and between e8abdcf and 4869fc0.

📒 Files selected for processing (6)

• src/main/java/com/ject/vs/chat/adapter/event/ChatMessageEventListener.java
• src/main/java/com/ject/vs/chat/port/ChatService.java
• src/main/java/com/ject/vs/vote/port/VoteQueryService.java
• src/main/java/com/ject/vs/vote/port/in/VoteQueryUseCase.java
• src/unitTest/java/com/ject/vs/chat/adapter/event/ChatMessageEventListenerTest.java
• src/unitTest/java/com/ject/vs/chat/port/ChatServiceTest.java

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/chat-null-sender-vote-option-after-cancel

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