Update with recovered code from VM binaries (Jan 1)

Recovered from decompiled OpenMaui.Controls.Linux.dll:
- SkiaShell.cs: FlyoutHeader, FlyoutFooter, scroll support (918 -> 1325 lines)
- X11Window.cs: Cursor support (XCreateFontCursor, XDefineCursor)
- All handlers with dark mode support
- All services with latest implementations
- LinuxApplication with theme change handling

Handlers/StackLayoutHandler.cs

@@ -0,0 +1,49 @@
+using Microsoft.Maui.Controls;
+using Microsoft.Maui.Handlers;
+
+namespace Microsoft.Maui.Platform.Linux.Handlers;
+
+public class StackLayoutHandler : LayoutHandler
+{
+	public new static IPropertyMapper<IStackLayout, StackLayoutHandler> Mapper = (IPropertyMapper<IStackLayout, StackLayoutHandler>)(object)new PropertyMapper<IStackLayout, StackLayoutHandler>((IPropertyMapper[])(object)new IPropertyMapper[1] { (IPropertyMapper)LayoutHandler.Mapper }) { ["Spacing"] = MapSpacing };
+
+	public StackLayoutHandler()
+		: base((IPropertyMapper?)(object)Mapper)
+	{
+	}
+
+	protected override SkiaLayoutView CreatePlatformView()
+	{
+		return new SkiaStackLayout();
+	}
+
+	protected override void ConnectHandler(SkiaLayoutView platformView)
+	{
+		if (platformView is SkiaStackLayout skiaStackLayout)
+		{
+			ILayout virtualView = ((ViewHandler<ILayout, SkiaLayoutView>)(object)this).VirtualView;
+			IStackLayout val = (IStackLayout)(object)((virtualView is IStackLayout) ? virtualView : null);
+			if (val != null)
+			{
+				if (((ViewHandler<ILayout, SkiaLayoutView>)(object)this).VirtualView is HorizontalStackLayout)
+				{
+					skiaStackLayout.Orientation = StackOrientation.Horizontal;
+				}
+				else if (((ViewHandler<ILayout, SkiaLayoutView>)(object)this).VirtualView is VerticalStackLayout || ((ViewHandler<ILayout, SkiaLayoutView>)(object)this).VirtualView is StackLayout)
+				{
+					skiaStackLayout.Orientation = StackOrientation.Vertical;
+				}
+				skiaStackLayout.Spacing = (float)val.Spacing;
+			}
+		}
+		base.ConnectHandler(platformView);
+	}
+
+	public static void MapSpacing(StackLayoutHandler handler, IStackLayout layout)
+	{
+		if (((ViewHandler<ILayout, SkiaLayoutView>)(object)handler).PlatformView is SkiaStackLayout skiaStackLayout)
+		{
+			skiaStackLayout.Spacing = (float)layout.Spacing;
+		}
+	}
+}