chore: scaffold Avalonia MVVM application and test project

SongTidy.Tests/MSTestSettings.cs

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+[assembly: Parallelize(Scope = ExecutionScope.MethodLevel)]

SongTidy.Tests/ProjectSmokeTests.cs

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+namespace SongTidy.Tests;
+
+/// <summary>
+/// Contains baseline tests that verify the test project is wired to the application assembly.
+/// </summary>
+[TestClass]
+public sealed class ProjectSmokeTests {
+    /// <summary>
+    /// Verifies that the main application assembly can be loaded from the test project.
+    /// </summary>
+    [TestMethod]
+    public void MainAssemblyIsReferenced() {
+        var assemblyName = typeof(global::SongTidy.ViewModels.MainWindowViewModel).Assembly.GetName().Name;
+
+        Assert.AreEqual("SongTidy", assemblyName);
+    }
+}

SongTidy.Tests/SongTidy.Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <LangVersion>latest</LangVersion>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="MSTest" Version="4.0.2" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="Microsoft.VisualStudio.TestTools.UnitTesting" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\SongTidy\SongTidy.csproj" />
+  </ItemGroup>
+
+</Project>

SongTidy.slnx

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+<Solution>
+  <Project Path="SongTidy.Tests/SongTidy.Tests.csproj" />
+  <Project Path="SongTidy/SongTidy.csproj" />
+</Solution>

SongTidy/App.axaml

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+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             x:Class="SongTidy.App"
+             xmlns:local="using:SongTidy"
+             xmlns:semi="https://irihi.tech/semi"
+             RequestedThemeVariant="Default">
+             <!-- "Default" ThemeVariant follows system theme variant. "Dark" or "Light" are other available options. -->
+
+    <Application.DataTemplates>
+        <local:ViewLocator/>
+    </Application.DataTemplates>
+  
+    <Application.Styles>
+        <!-- Use the Semi design theme instead of the default Fluent theme. -->
+        <semi:SemiTheme />
+        <!-- Apply Semi styling to the DataGrid control. -->
+        <semi:DataGridSemiTheme />
+    </Application.Styles>
+</Application>

SongTidy/App.axaml.cs

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+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Markup.Xaml;
+
+using SongTidy.ViewModels;
+using SongTidy.Views;
+
+namespace SongTidy;
+
+public partial class App : Application {
+    public override void Initialize() {
+        AvaloniaXamlLoader.Load(this);
+    }
+
+    public override void OnFrameworkInitializationCompleted() {
+        if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop) {
+            desktop.MainWindow = new MainWindow {
+                DataContext = new MainWindowViewModel(),
+            };
+        }
+
+        base.OnFrameworkInitializationCompleted();
+    }
+
+}

SongTidy/Program.cs

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+using System;
+
+using Avalonia;
+using Avalonia.ReactiveUI;
+
+namespace SongTidy;
+
+/// <summary>
+/// Provides the application entry point and Avalonia configuration.
+/// </summary>
+sealed class Program {
+    // Initialization code. Don't use any Avalonia, third-party APIs or any
+    // SynchronizationContext-reliant code before AppMain is called: things aren't initialized
+    // yet and stuff might break.
+    [STAThread]
+    public static void Main(string[] args) => BuildAvaloniaApp()
+        .StartWithClassicDesktopLifetime(args);
+
+    /// <summary>
+    /// Builds the Avalonia application configuration.
+    /// </summary>
+    /// <remarks>
+    /// This method is also discovered by the Avalonia visual designer, so it must remain public.
+    /// </remarks>
+    /// <returns>The configured application builder.</returns>
+    public static AppBuilder BuildAvaloniaApp()
+        => AppBuilder.Configure<App>()
+            .UsePlatformDetect()
+            .WithInterFont()
+            .LogToTrace()
+            .UseReactiveUI();
+}

SongTidy/SongTidy.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net10.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <BuiltInComInteropSupport>true</BuiltInComInteropSupport>
+    <ApplicationManifest>app.manifest</ApplicationManifest>
+    <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Folder Include="Models\" />
+    <AvaloniaResource Include="Assets\**" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Avalonia" Version="11.3.22" />
+    <PackageReference Include="Avalonia.Desktop" Version="11.3.22" />
+    <PackageReference Include="Avalonia.Themes.Fluent" Version="11.3.22" />
+    <PackageReference Include="Avalonia.Fonts.Inter" Version="11.3.22" />
+    <!--Condition below is needed to remove Avalonia.Diagnostics package from build output in Release configuration.-->
+    <PackageReference Include="Avalonia.Diagnostics" Version="11.3.22">
+      <IncludeAssets Condition="'$(Configuration)' != 'Debug'">None</IncludeAssets>
+      <PrivateAssets Condition="'$(Configuration)' != 'Debug'">All</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="Avalonia.ReactiveUI" Version="11.3.9" />
+    <PackageReference Include="Avalonia.Controls.DataGrid" Version="11.3.13" />
+    <PackageReference Include="Semi.Avalonia" Version="11.3.14" />
+    <PackageReference Include="Semi.Avalonia.DataGrid" Version="11.3.13" />
+    <PackageReference Include="IconPacks.Avalonia.Lucide" Version="2.0.0" />
+  </ItemGroup>
+</Project>

SongTidy/ViewLocator.cs

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+using System;
+
+using Avalonia.Controls;
+using Avalonia.Controls.Templates;
+
+using SongTidy.ViewModels;
+
+namespace SongTidy;
+
+/// <summary>
+/// Resolves a view for a view model by replacing the "ViewModel" suffix
+/// with "View" in the full type name.
+/// </summary>
+public class ViewLocator : IDataTemplate {
+    /// <summary>
+    /// Creates the view that corresponds to the supplied view model.
+    /// </summary>
+    /// <param name="param">The view model instance to resolve a view for.</param>
+    /// <returns>
+    /// The resolved view, or a diagnostic text block when no matching view exists.
+    /// </returns>
+    public Control? Build(object? param) {
+        if (param is null)
+            return null;
+
+        // Convention-based lookup: SongTidy.ViewModels.FooViewModel -> SongTidy.Views.FooView.
+        var name = param.GetType().FullName!.Replace("ViewModel", "View", StringComparison.Ordinal);
+        var type = Type.GetType(name);
+
+        if (type != null) {
+            return (Control)Activator.CreateInstance(type)!;
+        }
+
+        // Show the unresolved type name instead of failing silently during development.
+        return new TextBlock { Text = "Not Found: " + name };
+    }
+
+    /// <summary>
+    /// Determines whether the supplied data object is a view model handled by this locator.
+    /// </summary>
+    /// <param name="data">The data object to inspect.</param>
+    /// <returns><see langword="true"/> when the object derives from <see cref="ViewModelBase"/>.</returns>
+    public bool Match(object? data) {
+        return data is ViewModelBase;
+    }
+}

SongTidy/ViewModels/MainWindowViewModel.cs

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+namespace SongTidy.ViewModels;
+
+/// <summary>
+/// Represents the state and commands of the main application window.
+/// </summary>
+public class MainWindowViewModel : ViewModelBase {
+    /// <summary>
+    /// Gets a temporary greeting displayed by the template view.
+    /// </summary>
+    public string Greeting { get; } = "Welcome to Avalonia!";
+}

SongTidy/ViewModels/ViewModelBase.cs

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+using ReactiveUI;
+
+namespace SongTidy.ViewModels;
+
+/// <summary>
+/// Serves as the common base class for all view models in the application,
+/// providing ReactiveUI change notification support.
+/// </summary>
+public class ViewModelBase : ReactiveObject {
+}

SongTidy/Views/MainWindow.axaml

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+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:vm="using:SongTidy.ViewModels"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+        x:Class="SongTidy.Views.MainWindow"
+        x:DataType="vm:MainWindowViewModel"
+        Icon="/Assets/avalonia-logo.ico"
+        Title="SongTidy">
+
+    <Design.DataContext>
+        <!-- This only sets the DataContext for the previewer in an IDE,
+             to set the actual DataContext for runtime, set the DataContext property in code (look at App.axaml.cs) -->
+        <vm:MainWindowViewModel/>
+    </Design.DataContext>
+
+    <TextBlock Text="{Binding Greeting}" HorizontalAlignment="Center" VerticalAlignment="Center"/>
+
+</Window>

SongTidy/Views/MainWindow.axaml.cs

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+using Avalonia.Controls;
+
+namespace SongTidy.Views;
+
+public partial class MainWindow : Window {
+    public MainWindow() {
+        InitializeComponent();
+    }
+}

SongTidy/app.manifest

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+<?xml version="1.0" encoding="utf-8"?>
+<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1">
+  <!-- This manifest is used on Windows only.
+       Don't remove it as it might cause problems with window transparency and embedded controls.
+       For more details visit https://learn.microsoft.com/en-us/windows/win32/sbscs/application-manifests -->
+  <assemblyIdentity version="1.0.0.0" name="SongTidy.Desktop"/>
+
+  <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+    <application>
+      <!-- A list of the Windows versions that this application has been tested on
+           and is designed to work with. Uncomment the appropriate elements
+           and Windows will automatically select the most compatible environment. -->
+
+      <!-- Windows 10 -->
+      <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}" />
+    </application>
+  </compatibility>
+</assembly>