Better warning chain styling (#14934)
Improve the styling of warning chains for Python installation errors.
Apply the same logic to other internal warning and error formatting
locations.
**Before**
<img width="1232" height="364" alt="Screenshot from 2025-07-28 10-06-41"
src="https://github.com/user-attachments/assets/e3befe14-ad4c-44ed-8b0a-57d9c9a3b815"
/>
**After**
<img width="1232" height="364" alt="Screenshot from 2025-07-28 10-23-49"
src="https://github.com/user-attachments/assets/1bd890c1-5dbb-4662-93bd-14430c060a69"
/>
