[WinUI] XamlDefaultNavigationBar resource could not be resolved

[morning4coffe-dev]

When following the guide on https://platform.uno/docs/articles/external/uno.toolkit.ui/doc/controls/NavigationBar.html#windows, it fails on WinUI with the following exception:

Here is a repro:

<Page.Resources>
    <Style TargetType="utu:NavigationBar"
           BasedOn="{StaticResource XamlDefaultNavigationBar}" />
</Page.Resources>
<Grid>
    <utu:NavigationBar Content="Test"
                       HorizontalAlignment="Stretch">
        <utu:NavigationBar.PrimaryCommands>
            <AppBarButton Icon="Home"
                          Label="Home" />
        </utu:NavigationBar.PrimaryCommands>
    </utu:NavigationBar>
</Grid>

Originally posted by @morning4coffe-dev in unoplatform/uno#19019 (comment)