Release Notes:

- Fix close button hover text color on Windows

| Before | After |
| --- | --- |
| <img width="166" height="137" alt="before"
src="https://github.com/user-attachments/assets/fcd225c4-c73f-4e21-8e8d-459395df27ec"
/> |<img width="188" height="156" alt="after"
src="https://github.com/user-attachments/assets/89f5dcba-d677-4eb9-a9b4-170eb9792cb2"
/> |


https://github.com/user-attachments/assets/27e88bf1-eddd-4ec8-a360-6a68eef484e0

And I also improved this file's implementation to merge the
`WindowsCaptionButtonIcon` into `WindowsCaptionButton`.