[BUG] Trimmed: BackgroundColor with Theme

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Did you read the "Reporting a bug" section on Contributing file?

- [x] I have read the "Reporting a bug" section on Contributing file: https://github.com/CommunityToolkit/Maui/blob/main/CONTRIBUTING.md#reporting-a-bug

### Current Behavior

When I build the MAUI Android app in Release mode, the BackgroundColor and TextColor binding properties are not handled via the theme.

### Expected Behavior

The BackgroundColor and TextColor properties should use the theme-based colors defined via AppThemeColor, but instead, they are defaulting to the default values.

### Steps To Reproduce

1. Create a MAUI project
2. Add the Community Toolkit MAUI library
3. On the Main page, add a Border and a style that sets the background color using AppThemeColor
4. Build in Debug and then in Release

### Link to public reproduction project repository

Needs reproduction

### Environment

```markdown
- .NET MAUI CommunityToolkit: 15.0.1
- OS: Android 12
- .NET MAUI: 10.0.101
- .NET Core: 10
```

### Anything else?

WORKAROUND => Added to the project file ``````

Start by reproducing the reported behavior in a .NET MAUI Android app, comparing Debug and Release builds with a Border style using AppThemeColor on the Main page. Investigate the project file and the CommunityToolkit.Maui trimming behavior, using the TrimmerRootAssembly workaround as a clue. Done means BackgroundColor and TextColor bindings use the theme-based colors in Release without requiring that workaround.

Written by the indexing model from the issue text.