fix(player): increase network timeouts and retry policy:
- Increased OkHttp read timeout to 60s and connect timeout to 15s to handle slow servers and unstable connections.
- Implemented custom LoadErrorHandlingPolicy to increase retry attempts (up to 5) before failing playback.
- Enabled retryOnConnectionFailure in OkHttpClient.
feat(ui): add buffer visualization to seekbar and update player UI:
- Added secondary progress to SeekBar to visualize buffered video content.
- Updated Player UI