Issue with multi-instance session activation on Local HTTP Transport

[cyanxwh]

Subject: Issue with multi-instance session activation on Local HTTP Transport

Description:
I am attempting to use MCP for Unity with multiple projects simultaneously as supported in v7.0.0. While I have the HTTP server running, I am encountering issues connecting a second project instance.

Steps to Reproduce:
Open Project A and start the Local HTTP Server via Window > MCP for Unity.
Open Project B.
Navigate to Window > MCP for Unity in Project B.
Observe that there is no "Start Session" or "Start Server" button available when Transport is set to "HTTP Local," whereas the option exists under "HTTP Remote."

Expected Behavior:
Project B should be able to connect to the existing local HTTP server and show "Session Active" so that I can switch between instances using tools or project names.

Environment:
Unity Version: 6000.0.41f
MCP for Unity Version: v8.7.1
OS: Windows

[dsarno]

Fixed by #517 . Thanks.