refactor: FSD 레이어 의존성 위반 수정

[jpark0506]

Summary

• Emotion 타입을 shared/types/emotion.ts로 추출하여 shared → entities 순환 의존성 제거
• WeeklyStatistics, MonthlyFrequencyStatistics 컴포넌트를 widgets/statistics로 이동 (entities 의존 컴포넌트가 shared에 있던 위반)
• chat-pending 모듈을 entities/chatbot/lib으로 이동 (ChatMessage 타입 의존)
• shared/lib/fcm 전체를 entities/fcm/lib으로 이동 (entities/fcm/api 의존)
• 미사용 useSessionPending barrel export에서 제거

Test plan

• TypeScript typecheck 통과
• ESLint 통과
• Jest 38개 테스트 통과 (chat-pending 테스트 포함)
• 앱 빌드 및 실행 확인

🤖 Generated with Claude Code

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✨ Finishing Touches

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• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch refactor/fsd-layer-violations

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