New missing chat bar button

As shown in the photo, I have experiment 2025-9-chat-input-ia-desktop set to "not eligible", but there's a new broken chat bar button that isn't associated with that experiment. <img width="1920" height="1080" alt="Image" src="https://github.com/user-attachments/assets/531c8b94-4c28-43d9-bcab-b03e80556a01" />