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/AccessibleRole.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 AccessibleRole
+{
+    Unknown,
+    Window,
+    Application,
+    Panel,
+    Frame,
+    Button,
+    CheckBox,
+    RadioButton,
+    ComboBox,
+    Entry,
+    Label,
+    List,
+    ListItem,
+    Menu,
+    MenuBar,
+    MenuItem,
+    ScrollBar,
+    Slider,
+    SpinButton,
+    StatusBar,
+    Tab,
+    TabPanel,
+    Text,
+    ToggleButton,
+    ToolBar,
+    ToolTip,
+    Tree,
+    TreeItem,
+    Image,
+    ProgressBar,
+    Separator,
+    Link,
+    Table,
+    TableCell,
+    TableRow,
+    TableColumnHeader,
+    TableRowHeader,
+    PageTab,
+    PageTabList,
+    Dialog,
+    Alert,
+    Filler,
+    Icon,
+    Canvas
+}