Add expand animation for SettingsExpander

[Aris-Offline]

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[NotYoojun]

This can be referenced: https://github.com/dotnet/wpf/blob/main/src%2FMicrosoft.DotNet.Wpf%2Fsrc%2FThemes%2FPresentationFramework.Fluent%2FStyles%2FExpander.xaml#L332-L546