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/AccessibleState.cs

@@ -0,0 +1,52 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+namespace Microsoft.Maui.Platform.Linux.Services;
+
+public enum AccessibleState
+{
+    Invalid,
+    Active,
+    Armed,
+    Busy,
+    Checked,
+    Collapsed,
+    Defunct,
+    Editable,
+    Enabled,
+    Expandable,
+    Expanded,
+    Focusable,
+    Focused,
+    HasToolTip,
+    Horizontal,
+    Iconified,
+    Modal,
+    MultiLine,
+    Multiselectable,
+    Opaque,
+    Pressed,
+    Resizable,
+    Selectable,
+    Selected,
+    Sensitive,
+    Showing,
+    SingleLine,
+    Stale,
+    Transient,
+    Vertical,
+    Visible,
+    ManagesDescendants,
+    Indeterminate,
+    Required,
+    Truncated,
+    Animated,
+    InvalidEntry,
+    SupportsAutocompletion,
+    SelectableText,
+    IsDefault,
+    Visited,
+    Checkable,
+    HasPopup,
+    ReadOnly
+}