Major production merge: GTK support, context menus, and dispatcher fixes

Core Infrastructure:
- Add Dispatching folder with LinuxDispatcher, LinuxDispatcherProvider, LinuxDispatcherTimer
- Add Native folder with P/Invoke wrappers (GTK, GLib, GDK, Cairo, WebKit)
- Add GTK host window system with GtkHostWindow and GtkSkiaSurfaceWidget
- Update LinuxApplication with GTK mode, theme handling, and icon support
- Fix duplicate LinuxDispatcher in LinuxMauiContext

Handlers:
- Add GtkWebViewManager and GtkWebViewPlatformView for GTK WebView
- Add FlexLayoutHandler and GestureManager
- Update multiple handlers with ToViewHandler fix and missing mappers
- Add MauiHandlerExtensions with ToViewHandler extension method

Views:
- Add SkiaContextMenu with hover, keyboard, and dark theme support
- Add LinuxDialogService with context menu management
- Add SkiaFlexLayout for flex container support
- Update SkiaShell with RefreshTheme, MauiShell, ContentRenderer
- Update SkiaWebView with SetMainWindow, ProcessGtkEvents
- Update SkiaImage with LoadFromBitmap method

Services:
- Add AppInfoService, ConnectivityService, DeviceDisplayService, DeviceInfoService
- Add GtkHostService, GtkContextMenuService, MauiIconGenerator

Window:
- Add CursorType enum and GtkHostWindow
- Update X11Window with SetIcon, SetCursor methods

Build: SUCCESS (0 errors)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Views/SkiaImage.cs

@@ -210,6 +210,25 @@ public class SkiaImage : SkiaView
         }
     }
 
+    /// <summary>
+    /// Loads the image from an SKBitmap.
+    /// </summary>
+    public void LoadFromBitmap(SKBitmap bitmap)
+    {
+        try
+        {
+            Bitmap = bitmap;
+            _isLoading = false;
+            ImageLoaded?.Invoke(this, EventArgs.Empty);
+        }
+        catch (Exception ex)
+        {
+            _isLoading = false;
+            ImageLoadingError?.Invoke(this, new ImageLoadingErrorEventArgs(ex));
+        }
+        Invalidate();
+    }
+
     protected override SKSize MeasureOverride(SKSize availableSize)
     {
         if (_image == null)