"Update" button remains in the clicked state instead of showing a progress in the "A new version of Assistant is available" pop-up

How to reproduce:
1. Create a new Unity project
2. Install the older version of AI Assistant package
3. Open the AI Assistant
4. Click the "Update" button in the "A new version of Assistant is available" pop-up

Expected results: The banner changes in a way to show that update is in progress
Actual results: The button remains in a clicked state and it is not clear if the update is in progress

Reproducible with: 2.7.0-pre.2
Not reproducible with: No other environment tested

Reproducible on: macOS Tahoe 26 (M1)
Not reproducible on: No other environment tested