list_connected_browsers reports isLocal: true for a browser on a different physical machine

Question

## Environment

Claude Code 2.1.201 (CLI), two Macs on the same LAN, extension on both, same account.

## Bug

`list_connected_browsers` reports `isLocal: true` for **both** connected browsers:

```json
[
  {"deviceId": "3112c087-…", "name": "Browser 1", "osPlatform": "macOS", "isLocal": true},
  {"deviceId": "3fe3204b-…", "name": "Browser 2", "osPlatform": "macOS", "isLocal": true}
]
```

One of them is on a different physical machine - confirmed by selecting it and navigating: the tab opened o