Spotify Access Token 리프레쉬

sequenceDiagram
    participant App as 앱
    participant Server as 서버
    participant Spotify as Spotify

    App->>Server: 1. POST: Session ID로 Access Token 요청
    note over Server: 2. Session ID 검증 
    Server->>Spotify: 3. POST [토큰 요청]<br/>(https://accounts.spotify.com/api/token)
    Spotify->>Server: 4. 응답 [Access Token, Refresh Token (선택적)]
    note over Server: 5. Session ID 연장<br/> 및 Refresh Token 저장 (선택적)
    Server->>App: 6. 응답 [Access Token 전달]
    note over App: 7. Key Chain에 Access Token 저장

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