Titlebar Chrome Buttons incorrect in light mode

### Describe the bug

The Chrome buttons in the titlebar are invisible in light mode (white on white)

### Steps to reproduce

```text
Open the app in light mode
```

### Expected behavior

Buttons are expected to follow Windows guidelines and change there foreground color when using different themes

### Screenshots


### Code Platform

- [ ] UWP
- [X] WinAppSDK / WinUI 3
- [ ] Web Assembly (WASM)
- [ ] Android
- [ ] iOS
- [ ] MacOS
- [ ] Linux / GTK

### Windows Build Number

- [ ] Windows 10 1809 (Build 17763)
- [ ] Windows 10 1903 (Build 18362)
- [ ] Windows 10 1909 (Build 18363)
- [ ] Windows 10 2004 (Build 19041)
- [ ] Windows 10 20H2 (Build 19042)
- [ ] Windows 10 21H1 (Build 19043)
- [ ] Windows 10 21H2 (Build 19044)
- [ ] Windows 10 22H2 (Build 19045)
- [X] Windows 11 21H2 (Build 22000)
- [ ] Other (specify)

### Other Windows Build number

_No response_

### App minimum and target SDK version

- [ ] Windows 10, version 1809 (Build 17763)
- [ ] Windows 10, version 1903 (Build 18362)
- [ ] Windows 10, version 1909 (Build 18363)
- [ ] Windows 10, version 2004 (Build 19041)
- [ ] Windows 10, version 2104 (Build 20348)
- [ ] Windows 11, version 22H2 (Build 22000)
- [ ] Other (specify)

### Other SDK version

_No response_

### Visual Studio Version

_No response_

### Visual Studio Build Number

_No response_

### Device form factor

Desktop

### Additional context

_No response_

### Help us help you

No, I'm unable to contribute a solution.

Beginne damit, das Problem in der WinAppSDK / WinUI 3-App unter Windows 11 21H2 bei aktiviertem Hellmodus zu reproduzieren, und ermittle anschließend die Formatierung der Chrome-Schaltflächen in der Titelleiste. Als erledigt gilt die Aufgabe, wenn die Schaltflächen sichtbar bleiben und ihre Vordergrundfarbe den Richtlinien des aktiven Windows-Designs folgt.

Vom Indexierungsmodell aus dem Issue-Text verfasst.