Private music rooms for trusted groups.

The app now has a runnable MVP slice: invite-only onboarding, private rooms, encrypted chat, a YouTube queue, backend-driven playback state, websocket sync, and a polished responsive room UI.

Private rooms + sync playback

Private Rooms

Users can create private rooms, land in room-specific pages, and stay scoped to explicit room membership instead of a public network shell.

Shared Playback

Room state now includes a YouTube-backed queue, backend-authoritative playback, and websocket sync for queue and playback changes.

Operational Slice

Encrypted chat, host moderation, admin reports, Docker deployment, docs, and Phase 5 test coverage are in place for the MVP slice.