Frequent UI Freezes (Beach Ball) during Agent Chat sessions on M4 Mac

报告没有指出源文件或测试。首先在 macOS 26.4、Xcode 26.4 和 CopilotForXcode v0.47.0 上复现一次持续较长的 Agent Chat 会话，然后在出现彩球时检查应用状态，包括主线程和内存的行为。完成的标准是确定原因并验证 UI 不再冻结；如适用，还要进行回归检查。

Description
I am experiencing frequent application hangs (spinning wait cursor/beach ball) when using the Agent Chat feature in CopilotForXcode. After a period of active use, the interface becomes unresponsive, necessitating a restart of Xcode to restore functionality.

Environment
Hardware: MacBook Air M4

Memory: 16GB RAM

macOS Version: [macOS 26.4]

Xcode Version: [Xcode 26.4]

CopilotForXcode Version: [v0.47.0]

Steps to Reproduce
Open Xcode and initiate a session with CopilotForXcode.

Engage in a prolonged conversation or multiple successive queries within the Agent Chat.

After some time, the UI freezes, and the "beach ball" appears.

Chat Window remains unresponsive for long time.

Observations
The issue seems to trigger more frequently during long chat histories.

System memory pressure appears manageable, but the communication between the agent and Xcode seems to dead-lock the main thread.

Restarting Xcode is currently the only workaround.

Additional Context
I am looking for advice on whether this is a known memory leak or a threading issue, and if there are any specific settings (e.g., chat history limits or model configurations) that can mitigate this behavior on 16GB RAM systems.