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/SkiaEntry.cs

@@ -1,8 +1,10 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using System.Collections.Generic;
 using SkiaSharp;
 using Microsoft.Maui.Platform.Linux.Rendering;
+using Microsoft.Maui.Platform.Linux.Services;
 
 namespace Microsoft.Maui.Platform;
 
@@ -980,11 +982,17 @@ public class SkiaEntry : SkiaView
 
     public override void OnPointerPressed(PointerEventArgs e)
     {
-        Console.WriteLine($"[SkiaEntry] OnPointerPressed - Text='{Text}', Placeholder='{Placeholder}', IsEnabled={IsEnabled}, IsFocused={IsFocused}");
-        Console.WriteLine($"[SkiaEntry] Bounds={Bounds}, ScreenBounds={ScreenBounds}, e.X={e.X}, e.Y={e.Y}");
-
+        Console.WriteLine($"[SkiaEntry] OnPointerPressed Button={e.Button} at ({e.X}, {e.Y})");
         if (!IsEnabled) return;
 
+        // Handle right-click context menu
+        if (e.Button == PointerButton.Right)
+        {
+            Console.WriteLine("[SkiaEntry] Right-click detected, showing context menu");
+            ShowContextMenu(e.X, e.Y);
+            return;
+        }
+
         // Check if clicked on clear button
         if (ShowClearButton && !string.IsNullOrEmpty(Text) && IsFocused)
         {
@@ -1217,6 +1225,38 @@ public class SkiaEntry : SkiaView
         Invalidate();
     }
 
+    private void ShowContextMenu(float x, float y)
+    {
+        Console.WriteLine($"[SkiaEntry] ShowContextMenu at ({x}, {y})");
+        bool hasSelection = _selectionLength != 0;
+        bool hasText = !string.IsNullOrEmpty(Text);
+        bool hasClipboard = !string.IsNullOrEmpty(SystemClipboard.GetText());
+
+        GtkContextMenuService.ShowContextMenu(new List<GtkMenuItem>
+        {
+            new GtkMenuItem("Cut", () =>
+            {
+                CutToClipboard();
+                Invalidate();
+            }, hasSelection),
+            new GtkMenuItem("Copy", () =>
+            {
+                CopyToClipboard();
+            }, hasSelection),
+            new GtkMenuItem("Paste", () =>
+            {
+                PasteFromClipboard();
+                Invalidate();
+            }, hasClipboard),
+            GtkMenuItem.Separator,
+            new GtkMenuItem("Select All", () =>
+            {
+                SelectAll();
+                Invalidate();
+            }, hasText)
+        });
+    }
+
     public override void OnFocusGained()
     {
         base.OnFocusGained();