fix: NativeAOT - replace reflection-based XAML bindings in SettingsPage

[Copilot]

DisplayMemberPath="Label" on the Theme and TranslationLanguage ComboBoxes uses reflection at runtime, which is trimmed in NativeAOT builds, causing WMC1510 warnings and a crash when opening the settings page.

Changes

• SettingsPage.xaml: Replace DisplayMemberPath="Label" with compiled ItemTemplates using x:Bind and x:DataType="desktopapp:ISelectionItem" (Nickvision.Desktop.Application.ISelectionItem), generating property access code at build time instead of via reflection.

<!-- Before -->
<ComboBox x:Name="CmbTheme" DisplayMemberPath="Label" SelectionChanged="Cmb_SelectionChanged"/>

<!-- After -->
<ComboBox x:Name="CmbTheme" SelectionChanged="Cmb_SelectionChanged">
    <ComboBox.ItemTemplate>
        <DataTemplate x:DataType="desktopapp:ISelectionItem">
            <TextBlock Text="{x:Bind Label}"/>
        </DataTemplate>
    </ComboBox.ItemTemplate>
</ComboBox>

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[Copilot]

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[nlogozzo]

@copilot I merged in this change, but seeing System.ArgumentException: 'Value does not fall within the expected range.' now on line 28 of SettingsPage.xaml.cs