[BUG] Tray icon does not auto sync to system colour scheme while running in the background

### 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

3.2.0-beta1

### Windows version, edition, and architecture

Windows 11 Pro for Workstations 26100.3775 amd64

### Describe your issue

UnigetUI's tray icon only sync to windows colour scheme when it's window is opened, but not in the background.


### Steps to reproduce the issue

_No response_

### UniGetUI Log

```text
no log needed
```

### Package Managers Logs

```text
no log needed
```

### Relevant information

_No response_

### Screenshots and videos

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