Tapped event works on Back/Forward (XButton1 and XButton2) mouse button clicks

### Describe the bug

Tapped event works on Back/Forward (and middle, btw) mouse button clicks

### Why is this important?

We have NavigationView component, that has 'back' icon. But when you try to handle XButton1 on window scope - it still triggers tapped on every component inside window. Because `TappedRoutedEventArgs` don't have additional information about mouse buttons, it's impossible to use Tapped handler anywhere inside window.

Workaround with PointerReleased is not really good because when user pressed mouse on one component but released on another one it is still triggers.

### Steps to reproduce the bug

```

```

```
private async void OnTapped(object sender, TappedRoutedEventArgs e)
{
///
}
```

### Actual behavior

Mouse back/forward trigger event handler.

### Expected behavior

Mouse back/forward do not trigger event handler.

### Screenshots

_No response_

### NuGet package version

2.3.1

### Windows version

Windows 11 (26H1): Build 28000

### Additional context

_No response_

Start by reproducing the issue with the Border XAML and OnTapped handler shown in the report, then trace how XButton1 and XButton2 mouse input reaches the Tapped event. Done means Back/Forward mouse clicks no longer raise Tapped, while ordinary taps and the existing navigation behavior remain unaffected.

Written by the indexing model from the issue text.