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>

Handlers/PickerHandler.cs

@@ -22,6 +22,7 @@ public partial class PickerHandler : ViewHandler<IPicker, SkiaPicker>
             [nameof(IPicker.TitleColor)] = MapTitleColor,
             [nameof(IPicker.SelectedIndex)] = MapSelectedIndex,
             [nameof(IPicker.TextColor)] = MapTextColor,
+            [nameof(ITextStyle.Font)] = MapFont,
             [nameof(IPicker.CharacterSpacing)] = MapCharacterSpacing,
             [nameof(IPicker.HorizontalTextAlignment)] = MapHorizontalTextAlignment,
             [nameof(IPicker.VerticalTextAlignment)] = MapVerticalTextAlignment,
@@ -129,6 +130,22 @@ public partial class PickerHandler : ViewHandler<IPicker, SkiaPicker>
         }
     }
 
+    public static void MapFont(PickerHandler handler, IPicker picker)
+    {
+        if (handler.PlatformView is null) return;
+
+        var font = picker.Font;
+        if (!string.IsNullOrEmpty(font.Family))
+        {
+            handler.PlatformView.FontFamily = font.Family;
+        }
+        if (font.Size > 0)
+        {
+            handler.PlatformView.FontSize = (float)font.Size;
+        }
+        handler.PlatformView.Invalidate();
+    }
+
     public static void MapCharacterSpacing(PickerHandler handler, IPicker picker)
     {
         // Character spacing could be implemented with custom text rendering