Improve the layout and text display of API key configuration in multiple
language model providers to ensure proper text wrapping and ellipsis
handling when API URLs are long.

Before:

<img width="320" alt="image"
src="https://github.com/user-attachments/assets/2f89182c-34a0-4f95-a43a-c2be98d34873"
/>

After:

<img width="320" alt="image"
src="https://github.com/user-attachments/assets/09bf5cc3-07f0-47bc-b21a-d84b8b1caa67"
/>

Changes include:
- Add proper flex layout with overflow handling
- Replace truncate_and_trailoff with CSS text ellipsis
- Ensure consistent UI behavior across all providers

Release Notes:

- Improved API key configuration display in language model settings