Fix unexpected CLASS_CANCEL broadcast

[dutexion]

Summary

• prevent broadcasting CLASS_CANCEL when a teacher's SSE connection closes unintentionally

Testing

• npm test (fails: jest not found)

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https://chatgpt.com/codex/tasks/task_e_68521423614c832cbab0259d0489e64b

Summary by CodeRabbit

• Bug Fixes
  • 교사 클라이언트 연결이 종료될 때 더 이상 모든 학생에게 수업 취소 알림이 전송되지 않습니다.

[coderabbitai]

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[dutexion]

음 이거 아닌데;

수업 시작하자마자 CLASS_CANCEL 날아와서 수정한건데, 흠 다른 방식으로 수정해야 됨
@Eunho0922