themes: Implement Bright Black and Bright White colors (#36761)

Before:
<img width="356" height="50" alt="image"
src="https://github.com/user-attachments/assets/c4f4ae53-8820-4f22-b306-2e5062cfe552"
/>

After:
<img width="340" height="41" alt="image"
src="https://github.com/user-attachments/assets/8e69d9dc-5640-4e41-845d-f299fc5954e3"
/>


Release Notes:

- Fixed ANSI Bright Black and Bright White colors
eb0f9ddcdcOleksiy Syvokon committed on 8/22/2025, 4:03:47 PM· committed by GitHubparentac9fdaa
3 files changedLine totals unavailable