InvalidStateError: Failed to execute 'send' on 'WebSocket': Still in CONNECTING state.

## Error

```
Failed to execute 'send' on 'WebSocket': Still in CONNECTING state.
```

## Stack trace

```
/asset/asset.js:2 in e.WebsocketManager.send
/asset/asset.js:2 in e.EntityManager.flush
../node_modules/@sentry/browser/src/helpers.ts:117 in sentryWrapped
```

## Tracking Details
- **Project**: exercism-js
- **Sentry**: [InvalidStateError: Failed to execute 'send' on 'WebSocket': Still in CONNECTING state.](https://thalamus-ai.sentry.io/issues/144962841/)
- **Culprit**: e.WebsocketManager.send(asset/asset)
- **First seen:** Sep 4, 2026

Start with the reported calls in asset/asset.js, especially WebsocketManager.send and EntityManager.flush, and inspect how the WebSocket connection state is handled before sending. Reproduce the Sentry error if possible and trace the relevant source around the bundled asset. Done means the CONNECTING-state exception no longer occurs during the reported exercism-js flow.

Written by the indexing model from the issue text.