Verify Views files against decompiled, extract embedded types

Fixed files:
- SkiaImageButton.cs: Added SVG support with multi-path search
- SkiaNavigationPage.cs: Added LinuxApplication.IsGtkMode check
- SkiaRefreshView.cs: Added ICommand support (Command, CommandParameter)
- SkiaTemplatedView.cs: Added missing using statements

Extracted embedded types to separate files (matching decompiled pattern):
- From SkiaMenuBar.cs: MenuBarItem, MenuItem, SkiaMenuFlyout, MenuItemClickedEventArgs
- From SkiaNavigationPage.cs: NavigationEventArgs
- From SkiaTabbedPage.cs: TabItem
- From SkiaVisualStateManager.cs: SkiaVisualStateGroupList, SkiaVisualStateGroup, SkiaVisualState, SkiaVisualStateSetter
- From SkiaSwipeView.cs: SwipeItem, SwipeStartedEventArgs, SwipeEndedEventArgs
- From SkiaFlyoutPage.cs: FlyoutLayoutBehavior (already separate)
- From SkiaIndicatorView.cs: IndicatorShape (already separate)
- From SkiaBorder.cs: SkiaFrame
- From SkiaCarouselView.cs: PositionChangedEventArgs
- From SkiaCollectionView.cs: SkiaSelectionMode, ItemsLayoutOrientation
- From SkiaContentPresenter.cs: LayoutAlignment

Verified matching decompiled:
- SkiaContextMenu.cs, SkiaFlexLayout.cs, SkiaGraphicsView.cs

Build: 0 errors

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Hosting/LinuxProgramHost.cs

@@ -2,9 +2,10 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Maui.Hosting;
 using Microsoft.Maui.Controls;
-using Microsoft.Maui.Platform;
+using Microsoft.Maui.Controls.Hosting;
+using Microsoft.Maui.Hosting;
+using Microsoft.Maui.Platform.Linux.Services;
 using SkiaSharp;
 
 namespace Microsoft.Maui.Platform.Linux.Hosting;
@@ -44,6 +45,10 @@ public static class LinuxProgramHost
                      ?? new LinuxApplicationOptions();
         ParseCommandLineOptions(args, options);
 
+        // Initialize GTK for WebView support
+        GtkHostService.Instance.Initialize(options.Title, options.Width, options.Height);
+        Console.WriteLine("[LinuxProgramHost] GTK initialized for WebView support");
+
         // Create Linux application
         using var linuxApp = new LinuxApplication();
         linuxApp.Initialize(options);