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src/App.axaml.cs

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+using System;
+using System.Linq;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Data.Core;
+using Avalonia.Data.Core.Plugins;
+using Avalonia.Input;
+using Avalonia.Interactivity;
+using Avalonia.Markup.Xaml;
+using MarkdownEditor.ViewModels;
+using MarkdownEditor.Views;
+
+namespace MarkdownEditor;
+
+/// <summary>
+/// Main application class.
+/// Handles application initialization and lifetime management.
+/// </summary>
+public partial class App : Application
+{
+    /// <inheritdoc/>
+    public override void Initialize()
+    {
+        AvaloniaXamlLoader.Load(this);
+        SetupNativeMenu();
+    }
+
+    /// <summary>
+    /// Sets up the native macOS menu with About dialog.
+    /// </summary>
+    private void SetupNativeMenu()
+    {
+        var appMenu = NativeMenu.GetMenu(this);
+        if (appMenu != null)
+        {
+            // About Markus
+            var aboutItem = new NativeMenuItem { Header = "About Markus" };
+            aboutItem.Click += AboutMarkus_Click;
+            appMenu.Items.Add(aboutItem);
+
+            // Separator
+            appMenu.Items.Add(new NativeMenuItemSeparator());
+
+            // Services
+            appMenu.Items.Add(new NativeMenuItem { Header = "Services" });
+
+            // Separator
+            appMenu.Items.Add(new NativeMenuItemSeparator());
+
+            // Hide Ormentia Markus
+            appMenu.Items.Add(new NativeMenuItem
+            {
+                Header = "Hide Ormentia Markus",
+                Gesture = KeyGesture.Parse("Cmd+H")
+            });
+
+            // Hide Others
+            appMenu.Items.Add(new NativeMenuItem
+            {
+                Header = "Hide Others",
+                Gesture = KeyGesture.Parse("Cmd+Alt+H")
+            });
+
+            // Show All
+            appMenu.Items.Add(new NativeMenuItem { Header = "Show All" });
+
+            // Separator
+            appMenu.Items.Add(new NativeMenuItemSeparator());
+
+            // Quit
+            appMenu.Items.Add(new NativeMenuItem
+            {
+                Header = "Quit Ormentia Markus",
+                Gesture = KeyGesture.Parse("Cmd+Q")
+            });
+        }
+    }
+
+    /// <inheritdoc/>
+    public override void OnFrameworkInitializationCompleted()
+    {
+        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+        {
+            // Avoid duplicate validations from both Avalonia and the CommunityToolkit.
+            // More info: https://docs.avaloniaui.net/docs/guides/development-guides/data-validation#manage-validationplugins
+            DisableAvaloniaDataAnnotationValidation();
+
+            // Check for file path in command line arguments
+            string? initialFilePath = null;
+            if (desktop.Args?.Length > 0)
+            {
+                // Get the first argument as potential file path
+                var arg = desktop.Args[0];
+                // Ensure it's a valid file path (not a flag/option)
+                if (!arg.StartsWith("-") && System.IO.File.Exists(arg))
+                {
+                    initialFilePath = arg;
+                }
+            }
+
+            desktop.MainWindow = new MainWindow
+            {
+                DataContext = new MainWindowViewModel(initialFilePath: initialFilePath),
+            };
+        }
+
+        base.OnFrameworkInitializationCompleted();
+    }
+
+    /// <summary>
+    /// Disables Avalonia's built-in data annotation validation to prevent conflicts with CommunityToolkit.
+    /// </summary>
+    private void DisableAvaloniaDataAnnotationValidation()
+    {
+        // Get an array of plugins to remove
+        var dataValidationPluginsToRemove =
+            BindingPlugins.DataValidators.OfType<DataAnnotationsValidationPlugin>().ToArray();
+
+        // remove each entry found
+        foreach (var plugin in dataValidationPluginsToRemove)
+        {
+            BindingPlugins.DataValidators.Remove(plugin);
+        }
+    }
+
+    /// <summary>
+    /// Handles the About Markus menu item click event.
+    /// </summary>
+    private void AboutMarkus_Click(object? sender, EventArgs e)
+    {
+        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop &&
+            desktop.MainWindow != null)
+        {
+            var aboutWindow = new AboutWindow();
+            aboutWindow.ShowDialog(desktop.MainWindow);
+        }
+    }
+}