First message is cut off in Agents Window (appears only after resizing Agents Window)

Latest Insiders on Mac OS

* Start a new session
* Send the request
* The user message is cut off
Was able to repro twice, 
Cannot repro any more.

<img width="870" height="259" alt="Image" src="https://github.com/user-attachments/assets/11600d25-08b9-411c-bded-9c0dd515e1a2" />