Please explain the motivation behind the feature request.
Enhance the user experience and reduce user frustration when network or security configurations (such as VPNs, firewalls, or proxies) prevent Goose Desktop from successfully sharing a session. Currently, when such a block occurs, the application returns a highly technical error message: "Failed to share session: Unexpected token '<',

Describe the solution you'd like
Replace the current technical error message with a concise, user-friendly, and actionable one.

Describe alternatives you've considered
Leaving it as-is

Additional context
The attached image shows the problematic error message.

• I have verified this does not duplicate an existing feature request