Live status over WebSocket

[iexwr]

Context

The dashboard/request page currently relies on polling or reload; status changes (paid) should appear without manual refresh.

Acceptance criteria

• Subscribe to a request room via the Socket.IO client (socket.emit('subscribe', { requestId })).
• On request:paid / request:cancelled, update the local status immediately.
• Clean up the subscription on unmount.

Technical notes

• Reuse socket.io-client (dependency present).
• Guard against reconnect storms (single subscription per mounted component).

Testing

• Test that a simulated socket event updates component state.