[BUG] Titlebar buttons (minimize, maximize, close) remain "selected" until mouseover

### Please confirm these before moving forward

- [x] I have searched for my issue and have not found a work-in-progress/duplicate/resolved issue.
- [x] I have tested that this issue has not been fixed in the latest [(beta or stable) release](https://github.com/marticliment/WingetUI/releases/).
- [x] I have checked the [FAQ](https://github.com/marticliment/WingetUI#frequently-asked-questions) section for solutions.
- [x] This issue is about a bug (if it is not, please use the [correct template](https://github.com/marticliment/WingetUI/issues/new/choose)).

### UniGetUI Version

3.3.6

### Windows version, edition, and architecture

Windows 11 Pro 26200.7171

### Describe your issue

Very minor visual-only glitch, I know, but any time you open the UniGetUI window (either from the taskbar or from the little running icon in the bottom right), the last titlebar button you clicked will remain highlighted indefinitely until you mouseover it and then mouse away from it. Strange issue, never seen this on any other program. I toggled the "show version in titlebar" feature but it made no difference.

### Steps to reproduce the issue

Open UniGetUI, then close/minimize it, then open it again.

### UniGetUI Log

```text
n/a
```

### Package Managers Logs

```text
n/a
```

### Relevant information

_No response_

### Screenshots and videos

_No response_