Function useLiveSeries

Create and own a LiveSeries for the component's lifetime.

Returns [live, snapshot]:

• live — a stable LiveSeries ref. Push events into it from effects or callbacks (e.g. WebSocket onmessage).
• snapshot — a throttled TimeSeries that updates when new events arrive. null when the series is empty.

The LiveSeries is created once on mount. Changing options after mount has no effect — pass stable options (literal or top-level constant).