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/CompletedToColorConverter.cs

@@ -0,0 +1,72 @@
+using System;
+using System.Globalization;
+using Microsoft.Maui.Controls;
+using Microsoft.Maui.Graphics;
+
+namespace TodoApp;
+
+public class CompletedToColorConverter : IValueConverter
+{
+	private static readonly Color AccentColor = Color.FromArgb("#26A69A");
+
+	private static readonly Color CompletedColor = Color.FromArgb("#9E9E9E");
+
+	private static readonly Color TextPrimaryLight = Color.FromArgb("#212121");
+
+	private static readonly Color TextSecondaryLight = Color.FromArgb("#757575");
+
+	private static readonly Color TextPrimaryDark = Color.FromArgb("#FFFFFF");
+
+	private static readonly Color TextSecondaryDark = Color.FromArgb("#B0B0B0");
+
+	public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+	{
+		//IL_0032: Unknown result type (might be due to invalid IL or missing references)
+		//IL_0038: Invalid comparison between Unknown and I4
+		bool flag = default(bool);
+		int num;
+		if (value is bool)
+		{
+			flag = (bool)value;
+			num = 1;
+		}
+		else
+		{
+			num = 0;
+		}
+		bool flag2 = (byte)((uint)num & (flag ? 1u : 0u)) != 0;
+		string text = (parameter as string) ?? "";
+		Application current = Application.Current;
+		bool flag3 = current != null && (int)current.RequestedTheme == 2;
+		if (text == "indicator")
+		{
+			if (!flag2)
+			{
+				return AccentColor;
+			}
+			return CompletedColor;
+		}
+		if (flag2)
+		{
+			return CompletedColor;
+		}
+		if (text == "notes")
+		{
+			if (!flag3)
+			{
+				return TextSecondaryLight;
+			}
+			return TextSecondaryDark;
+		}
+		if (!flag3)
+		{
+			return TextPrimaryLight;
+		}
+		return TextPrimaryDark;
+	}
+
+	public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
+	{
+		throw new NotImplementedException();
+	}
+}