stream post: a running view total (playback sessions since the livestream began, kept in statedb) in grey beside the live viewer count, which goes red while live; viewerCount events carry it as total Claude-Session: https://claude.ai/code/session_014aPQ5yqG9QFxKnbwQfCYKa (cherry picked from commit 7312578ed0838291b2364340f39b41a726c23d72)