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>

Views/SkiaTabbedPage.cs

@@ -394,29 +394,3 @@ public class SkiaTabbedPage : SkiaLayoutView
         base.OnPointerPressed(e);
     }
 }
-
-/// <summary>
-/// Represents a tab item with title, icon, and content.
-/// </summary>
-public class TabItem
-{
-    /// <summary>
-    /// The title displayed in the tab.
-    /// </summary>
-    public string Title { get; set; } = string.Empty;
-
-    /// <summary>
-    /// Optional icon path for the tab.
-    /// </summary>
-    public string? IconPath { get; set; }
-
-    /// <summary>
-    /// The content view displayed when this tab is selected.
-    /// </summary>
-    public SkiaView Content { get; set; } = null!;
-
-    /// <summary>
-    /// Optional badge text to display on the tab.
-    /// </summary>
-    public string? Badge { get; set; }
-}