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>

Services/AtSpi2AccessibilityService.cs

@@ -388,74 +388,3 @@ public class AtSpi2AccessibilityService : IAccessibilityService, IDisposable
 
     #endregion
 }
-
-/// <summary>
-/// Factory for creating accessibility service instances.
-/// </summary>
-public static class AccessibilityServiceFactory
-{
-    private static IAccessibilityService? _instance;
-    private static readonly object _lock = new();
-
-    /// <summary>
-    /// Gets the singleton accessibility service instance.
-    /// </summary>
-    public static IAccessibilityService Instance
-    {
-        get
-        {
-            if (_instance == null)
-            {
-                lock (_lock)
-                {
-                    _instance ??= CreateService();
-                }
-            }
-            return _instance;
-        }
-    }
-
-    private static IAccessibilityService CreateService()
-    {
-        try
-        {
-            var service = new AtSpi2AccessibilityService();
-            service.Initialize();
-            return service;
-        }
-        catch (Exception ex)
-        {
-            Console.WriteLine($"AccessibilityServiceFactory: Failed to create AT-SPI2 service - {ex.Message}");
-            return new NullAccessibilityService();
-        }
-    }
-
-    /// <summary>
-    /// Resets the singleton instance.
-    /// </summary>
-    public static void Reset()
-    {
-        lock (_lock)
-        {
-            _instance?.Shutdown();
-            _instance = null;
-        }
-    }
-}
-
-/// <summary>
-/// Null implementation of accessibility service.
-/// </summary>
-public class NullAccessibilityService : IAccessibilityService
-{
-    public bool IsEnabled => false;
-
-    public void Initialize() { }
-    public void Register(IAccessible accessible) { }
-    public void Unregister(IAccessible accessible) { }
-    public void NotifyFocusChanged(IAccessible? accessible) { }
-    public void NotifyPropertyChanged(IAccessible accessible, AccessibleProperty property) { }
-    public void NotifyStateChanged(IAccessible accessible, AccessibleState state, bool value) { }
-    public void Announce(string text, AnnouncementPriority priority = AnnouncementPriority.Polite) { }
-    public void Shutdown() { }
-}