Function spawn_ui_bridge 

pub async fn spawn_ui_bridge(
    server: RedDBServer,
    config: UiBridgeConfig,
) -> Result<UiBridge, Error>

Bind a loopback HTTP server that serves the UI bundle and mounts the RedWire-over-WS endpoint over server’s embedded engine, then spawn its serve loop. Returns once the listener is bound; the returned UiBridge carries the resolved address and a clean-shutdown handle.

Must be called from within a tokio runtime (it binds a tokio listener and spawns the serve task).