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/AccessibleStates.cs

@@ -0,0 +1,51 @@
+// 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;
+
+[Flags]
+public enum AccessibleStates : long
+{
+    None = 0L,
+    Active = 1L,
+    Armed = 2L,
+    Busy = 4L,
+    Checked = 8L,
+    Collapsed = 0x10L,
+    Defunct = 0x20L,
+    Editable = 0x40L,
+    Enabled = 0x80L,
+    Expandable = 0x100L,
+    Expanded = 0x200L,
+    Focusable = 0x400L,
+    Focused = 0x800L,
+    HasToolTip = 0x1000L,
+    Horizontal = 0x2000L,
+    Iconified = 0x4000L,
+    Modal = 0x8000L,
+    MultiLine = 0x10000L,
+    MultiSelectable = 0x20000L,
+    Opaque = 0x40000L,
+    Pressed = 0x80000L,
+    Resizable = 0x100000L,
+    Selectable = 0x200000L,
+    Selected = 0x400000L,
+    Sensitive = 0x800000L,
+    Showing = 0x1000000L,
+    SingleLine = 0x2000000L,
+    Stale = 0x4000000L,
+    Transient = 0x8000000L,
+    Vertical = 0x10000000L,
+    Visible = 0x20000000L,
+    ManagesDescendants = 0x40000000L,
+    Indeterminate = 0x80000000L,
+    Required = 0x100000000L,
+    Truncated = 0x200000000L,
+    Animated = 0x400000000L,
+    InvalidEntry = 0x800000000L,
+    SupportsAutocompletion = 0x1000000000L,
+    SelectableText = 0x2000000000L,
+    IsDefault = 0x4000000000L,
+    Visited = 0x8000000000L,
+    ReadOnly = 0x10000000000L
+}