fix: AuthInterceptor 토큰 재발급 실패 시 응답 leak으로 인한 크래시 수정

[unam98]

작업 배경

• 코스 상세 화면을 딥링크로 진입할 때 크래시가 재현됨 (FATAL EXCEPTION: OkHttp Dispatcher, IllegalStateException: closed)
• 딥링크 자체는 문제가 아니었고, SchemeActivity.isUserLoggedIn()이 토큰의 유효성 검증 없이 "존재 여부"만 확인해서, access/refresh 토큰이 둘 다 무효한 상태에서도 API를 그대로 호출하는 경로였음

원인

AuthInterceptor.handleGetNewTokenFailure가 토큰 재발급 요청의 실패 응답(refreshTokenResponse)을 close() 하지 않고 반환함. 안 닫힌 Response가 OkHttp 커넥션 풀을 오염시켜서, 바로 이어지는 재시도 요청의 응답을 읽던 HttpLoggingInterceptor가 IllegalStateException: closed로 죽음.

바로 위 handleGetRefreshTokenSuccess는 refreshTokenResponse.use { ... }로 제대로 닫는데, 실패 케이스만 빠뜨린 비대칭 버그였음.

변경 사항

• refreshTokenResponse.close() 한 줄 추가

영향 범위

• access token과 refresh token이 모두 만료/무효한 모든 경우에 영향 (딥링크 진입에 국한되지 않음)
• 딥링크 진입 시 더 자주 노출되는 이유: SchemeActivity가 토큰 유효성 검증 없이 바로 API 호출

Test Plan

• 실기기에서 access+refresh 토큰이 모두 무효한 상태로 딥링크 진입 → 수정 전 크래시 재현, 수정 후 크래시 없음(3회 반복 재현 후 확인) 확인
• ./gradlew testDebugUnitTest 전체 통과

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📥 Commits

Reviewing files that changed from the base of the PR and between c2ea494 and f3abc8a.

📒 Files selected for processing (2)

• app/build.gradle
• app/src/main/java/com/runnect/runnect/data/service/AuthInterceptor.kt

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