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/InputMethodServiceFactory.cs

@@ -180,24 +180,3 @@ public static class InputMethodServiceFactory
         }
     }
 }
-
-/// <summary>
-/// Null implementation of IInputMethodService for when no IME is available.
-/// </summary>
-public class NullInputMethodService : IInputMethodService
-{
-    public bool IsActive => false;
-    public string PreEditText => string.Empty;
-    public int PreEditCursorPosition => 0;
-
-    public event EventHandler<TextCommittedEventArgs>? TextCommitted;
-    public event EventHandler<PreEditChangedEventArgs>? PreEditChanged;
-    public event EventHandler? PreEditEnded;
-
-    public void Initialize(nint windowHandle) { }
-    public void SetFocus(IInputContext? context) { }
-    public void SetCursorLocation(int x, int y, int width, int height) { }
-    public bool ProcessKeyEvent(uint keyCode, KeyModifiers modifiers, bool isKeyDown) => false;
-    public void Reset() { }
-    public void Shutdown() { }
-}