Update with recovered code from VM binaries (Jan 1)

- ShellDemo: Updated all pages with recovered code, added AppShell.cs
- TodoApp: Updated core files, added converters
- XamlBrowser: Added recovered sample

TodoApp/TodoService.cs

@@ -1,61 +1,59 @@
-// TodoService - Manages todo items
-
+using System;
 using System.Collections.ObjectModel;
+using System.Linq;
 
 namespace TodoApp;
 
 public class TodoService
 {
-    private static TodoService? _instance;
-    public static TodoService Instance => _instance ??= new TodoService();
+	private static TodoService? _instance;
 
-    private int _nextId = 1;
+	private int _nextId = 1;
 
-    public ObservableCollection<TodoItem> Todos { get; } = new();
+	public static TodoService Instance => _instance ?? (_instance = new TodoService());
 
-    private TodoService()
-    {
-        // Add sample todos with varying lengths to test MaxLines=2 with ellipsis
-        AddTodo("Learn OpenMaui Linux", "Explore the SkiaSharp-based rendering engine for .NET MAUI on Linux desktop. This is a very long description that should wrap to multiple lines and demonstrate the ellipsis truncation feature when MaxLines is set to 2.");
-        AddTodo("Build amazing apps", "Create cross-platform applications that run on Windows, macOS, iOS, Android, and Linux! With OpenMaui, you can write once and deploy everywhere.");
-        AddTodo("Share with the community", "Contribute to the open-source project and help others build great Linux apps. Join our growing community of developers who are passionate about bringing .NET MAUI to Linux.");
-    }
+	public ObservableCollection<TodoItem> Todos { get; } = new ObservableCollection<TodoItem>();
 
-    public TodoItem AddTodo(string title, string notes = "")
-    {
-        var todo = new TodoItem
-        {
-            Id = _nextId++,
-            Index = Todos.Count, // Set index for alternating row colors
-            Title = title,
-            Notes = notes,
-            DueDate = DateTime.Today.AddDays(7)
-        };
-        Todos.Add(todo);
-        return todo;
-    }
+	public int CompletedCount => Todos.Count((TodoItem t) => t.IsCompleted);
 
-    /// <summary>
-    /// Refreshes the Index property on all items for alternating row colors.
-    /// </summary>
-    public void RefreshIndexes()
-    {
-        for (int i = 0; i < Todos.Count; i++)
-        {
-            Todos[i].Index = i;
-        }
-    }
+	public int TotalCount => Todos.Count;
 
-    public TodoItem? GetTodo(int id)
-    {
-        return Todos.FirstOrDefault(t => t.Id == id);
-    }
+	private TodoService()
+	{
+		AddTodo("Learn OpenMaui Linux", "Explore the SkiaSharp-based rendering engine for .NET MAUI on Linux desktop. This is a very long description that should wrap to multiple lines and demonstrate the ellipsis truncation feature when MaxLines is set to 2.");
+		AddTodo("Build amazing apps", "Create cross-platform applications that run on Windows, macOS, iOS, Android, and Linux! With OpenMaui, you can write once and deploy everywhere.");
+		AddTodo("Share with the community", "Contribute to the open-source project and help others build great Linux apps. Join our growing community of developers who are passionate about bringing .NET MAUI to Linux.");
+	}
 
-    public void DeleteTodo(TodoItem todo)
-    {
-        Todos.Remove(todo);
-    }
+	public TodoItem AddTodo(string title, string notes = "")
+	{
+		TodoItem todoItem = new TodoItem
+		{
+			Id = _nextId++,
+			Index = Todos.Count,
+			Title = title,
+			Notes = notes,
+			DueDate = DateTime.Today.AddDays(7.0)
+		};
+		Todos.Add(todoItem);
+		return todoItem;
+	}
 
-    public int CompletedCount => Todos.Count(t => t.IsCompleted);
-    public int TotalCount => Todos.Count;
+	public void RefreshIndexes()
+	{
+		for (int i = 0; i < Todos.Count; i++)
+		{
+			Todos[i].Index = i;
+		}
+	}
+
+	public TodoItem? GetTodo(int id)
+	{
+		return Todos.FirstOrDefault((TodoItem t) => t.Id == id);
+	}
+
+	public void DeleteTodo(TodoItem todo)
+	{
+		Todos.Remove(todo);
+	}
 }