[BUG] Snackbar + UseMaterial3 overrides BackgroundColor [Android/Material3]

### 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

Background is light-purple-ish-gray and not DarkOrange

### Expected Behavior

DarkOrange background

### Steps To Reproduce

Create a new project

```powershell
dotnet new maui -n SnackbarProblem
```

Replace the OnCounterClicked with the following

```csharp
private void OnCounterClicked(object? sender, EventArgs e)
{
Snackbar.Make(
"Hello, World!",
null,
"OK",
TimeSpan.FromSeconds(7),
new SnackbarOptions
{
BackgroundColor = Color.FromRgb(255, 140, 0), // DarkOrange
TextColor = Colors.White,
ActionButtonTextColor = Colors.White,
CornerRadius = 8,
Font = Microsoft.Maui.Font.SystemFontOfSize(14)
}).Show();
}
```

Run and click the button

Background is DarkOrange as expected. So far so good.

Now enable Material3:

```xml

true
```

And run and click the button

Background is light-purple-ish-gray and not DarkOrange anymore which is the problem.

### Link to public reproduction project repository

na

### Environment

```markdown

OS: Android / Material3
```

### Anything else?

_No response_

Start by creating the reported .NET MAUI project, reproducing the Snackbar with the supplied SnackbarOptions, and then enabling true. Compare the Android behavior with and without Material 3; done means the configured DarkOrange BackgroundColor remains visible when Material 3 is enabled.

Written by the indexing model from the issue text.