When a performer opens the served riptide UI, the server session must mirror the
editor state that the client boots with before any playback command is sent.
Fresh page load must not surface PlaybackTrackMissing for tracks that exist in
the UI seed but not yet in the server store.
- Add a client-to-server command that carries the client's current tracks and definitions as one state payload.
- On receipt, the server replaces its session tracks and definitions with the payload, preserves the server-configured slot capacity, persists both stores, and broadcasts a state snapshot.
- On every websocket connect or reconnect, the frontend sends the state command before any activate or silence command can be emitted from the connected session.
- The command JSON shape is stable across Haskell and PureScript encoders and decoders.
- Existing validation, save, apply, activate, and silence behavior remains unchanged.
- Backend protocol round-trip tests cover the new command.
- Backend server tests prove the command replaces tracks and definitions and writes both stores.
- Frontend tests cover the new command encoding and the connect-handshake command order.
./gate.shpasses, including frontend render smoke.- Opening a served UI against an empty state directory does not show a
Command failed: PlaybackTrackMissing ...toast/banner on fresh connect.