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StartAnimationAction throw exception when Animation is null

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### Describe the bug when `StartAnimationAction`'s `Animation` binding to a element with ElementName which has not been "loaded", if the animation is triggered, it will throw a exception ``` System.ArgumentNullException:...

### Describe the bug The AppNotificationManager [docs](https://learn.microsoft.com/en-us/windows/windows-app-sdk/api/winrt/microsoft.windows.appnotifications.appnotificationmanager.issupported?view=windows-app-sdk-1.5) has a Note about `PushNotificationManager` which is wrong and should be AppNotificationManager itself. And the code only checks if the process is elevated....

This issue is used to track `Acrobatics Battle` support.

Daylight savings time is currently not supported

### 想要的文档  Fiddler在初次使用时会弹出这样的对话框解释容器应用，我们应该可以参考一下 ### 需要更新的文档链接 _No response_ ### 最终检查 - [X] 我确认这一议题是与**文档**强烈相关的，而不是与 Snap Hutao 客户端或服务端应用程序相关的。

### Describe the bug As `DefaultSegmentedItemStyle` https://github.com/CommunityToolkit/Windows/blob/dec350be1dc1d7d9dda734f0de824d4f030aac35/components/Segmented/src/SegmentedItem/SegmentedItem.xaml#L627-L632 and `PivotSegmentedItemStyle` https://github.com/CommunityToolkit/Windows/blob/dec350be1dc1d7d9dda734f0de824d4f030aac35/components/Segmented/src/SegmentedItem/SegmentedItem.xaml#L861-L865 the `ContentHolder` hardcoded it's `Margin`, but https://github.com/CommunityToolkit/Windows/blob/dec350be1dc1d7d9dda734f0de824d4f030aac35/components/Segmented/src/SegmentedItem/SegmentedItem.xaml#L1061-L1066 `ButtonSegmentedItemStyle` using `Padding` property which come from `ButtonItemPadding` resource ### Expected behavior Add...

### Describe the bug CommunityToolkit.Common.StringExtensions.IsEmail method use a regex to check if a string is a valid email, it only allows lower-case local part. But according to [RFC5321 2.4](https://datatracker.ietf.org/doc/html/rfc5321#section-2.4) >...

Just randomly browsing files, and I found that IIconExtensions was made public but has no publicly accessible methods. https://github.com/dotnet/winforms/blob/main/src/System.Private.Windows.GdiPlus/System/Drawing/IIconExtensions.cs