APPS-3623 Kotlin 2.2.21 and OkHttp 5.3.2

[XanderZhu]

Summary

• update Kotlin to 2.2.21, AGP to 8.10.1 and Gradle wrapper to 8.11.1
• migrate Kotlin JVM target configuration to compilerOptions
• update OkHttp from 4.9.0 to 5.3.2 as a potential mitigation for APPS-3623 network/transport failures

APPS-3623 context

• Direct reproduction has not been achieved yet. The user log confirms the login flow, but does not contain a concrete network error: no HTTP code, endpoint, exception class, or stack trace.
• Code investigation confirms that real network/transport failures can be shown to the user as “Невозможно установить соединение с сервером”: timeout, DNS/TLS/socket/connect errors and other non-HTTP failures are mapped to this message. Similar fallback behavior exists outside auth, so the same class of problem can affect courses/notifications.
• The exact root cause for affected users cannot be confirmed with the available data. The most likely area is either real network/transport issues on device/network/route level or OkHttp edge cases.
• Crashlytics contains similar production errors: DNS failures, TLS failures, connect timeouts, HTTP/2 timeout/interruption. There is also an auth-adjacent case with SocketTimeoutException after social_login.
• OkHttp 5.x is relevant because newer versions include HTTP/2/DNS/connect behavior fixes and Happy Eyeballs for IPv4/IPv6 fallback. This can potentially reduce the issue rate, but cannot guarantee that all cases are fixed because such failures depend on device, network, route, edge/backend behavior and connection pool state.

Notes

• OkHttp 5.4.0 requires compileSdk 36; current project stays on compileSdk 35, so 5.3.2 is the latest compatible version checked here.
• Okio is allowed to move with OkHttp transitively.
• User-facing error text is intentionally not changed in this PR.
• Follow-up diagnostics are still needed to monitor the issue precisely: connection_problem_shown, network_request_failed, error_kind, path_group, protocol, duration_ms.

Verification

• ./gradlew :app:compileDebugKotlin
• ./gradlew :app:assembleDebug