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/NotificationService.cs

@@ -425,113 +425,3 @@ public class NotificationService
         return arg?.Replace("\\", "\\\\").Replace("\"", "\\\"") ?? "";
     }
 }
-
-/// <summary>
-/// Options for displaying a notification.
-/// </summary>
-public class NotificationOptions
-{
-    public string Title { get; set; } = "";
-    public string Message { get; set; } = "";
-    public string? IconPath { get; set; }
-    public string? IconName { get; set; } // Standard icon name like "dialog-information"
-    public NotificationUrgency Urgency { get; set; } = NotificationUrgency.Normal;
-    public int ExpireTimeMs { get; set; } = 5000; // 5 seconds default
-    public string? Category { get; set; } // e.g., "email", "im", "transfer"
-    public bool IsTransient { get; set; }
-    public Dictionary<string, string>? Actions { get; set; }
-}
-
-/// <summary>
-/// Notification urgency level.
-/// </summary>
-public enum NotificationUrgency
-{
-    Low,
-    Normal,
-    Critical
-}
-
-/// <summary>
-/// Reason a notification was closed.
-/// </summary>
-public enum NotificationCloseReason
-{
-    Expired = 1,
-    Dismissed = 2,
-    Closed = 3,
-    Undefined = 4
-}
-
-/// <summary>
-/// Internal context for tracking active notifications.
-/// </summary>
-internal class NotificationContext
-{
-    public string? Tag { get; set; }
-    public Dictionary<string, Action?>? ActionCallbacks { get; set; }
-}
-
-/// <summary>
-/// Event args for notification action events.
-/// </summary>
-public class NotificationActionEventArgs : EventArgs
-{
-    public uint NotificationId { get; }
-    public string ActionKey { get; }
-    public string? Tag { get; }
-
-    public NotificationActionEventArgs(uint notificationId, string actionKey, string? tag)
-    {
-        NotificationId = notificationId;
-        ActionKey = actionKey;
-        Tag = tag;
-    }
-}
-
-/// <summary>
-/// Event args for notification closed events.
-/// </summary>
-public class NotificationClosedEventArgs : EventArgs
-{
-    public uint NotificationId { get; }
-    public NotificationCloseReason Reason { get; }
-    public string? Tag { get; }
-
-    public NotificationClosedEventArgs(uint notificationId, NotificationCloseReason reason, string? tag)
-    {
-        NotificationId = notificationId;
-        Reason = reason;
-        Tag = tag;
-    }
-}
-
-/// <summary>
-/// Defines an action button for a notification.
-/// </summary>
-public class NotificationAction
-{
-    /// <summary>
-    /// Internal action key (not displayed).
-    /// </summary>
-    public string Key { get; set; } = "";
-
-    /// <summary>
-    /// Display label for the action button.
-    /// </summary>
-    public string Label { get; set; } = "";
-
-    /// <summary>
-    /// Callback to invoke when the action is clicked.
-    /// </summary>
-    public Action? Callback { get; set; }
-
-    public NotificationAction() { }
-
-    public NotificationAction(string key, string label, Action? callback = null)
-    {
-        Key = key;
-        Label = label;
-        Callback = callback;
-    }
-}