Add core UI

app/InkForge.Common/App.axaml

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+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="using:InkForge.Common"
+             x:Class="InkForge.Common.App"
+             RequestedThemeVariant="Default">
+             <!-- "Default" ThemeVariant follows system theme variant. "Dark" or "Light" are other available options. -->
+
+    <Application.Styles>
+        <FluentTheme />
+    </Application.Styles>
+</Application>

app/InkForge.Common/App.axaml.cs

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+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Markup.Xaml;
+
+using Microsoft.Extensions.Hosting;
+
+using ReactiveUI;
+
+namespace InkForge.Common;
+
+public partial class App : Application
+{
+	public static readonly StyledProperty<IHost> HostProperty = AvaloniaProperty.Register<App, IHost>("Host");
+
+	public IHost Host => GetValue(HostProperty);
+
+	public IServiceProvider Services => Host.Services;
+
+	public override void Initialize()
+	{
+		AvaloniaXamlLoader.Load(this);
+	}
+
+	public override void OnFrameworkInitializationCompleted()
+	{
+		// var viewModel = Services.Activate<MainViewModel>();
+		// var view = ViewLocator.Current.ResolveView(viewModel);
+		// switch (ApplicationLifetime)
+		// {
+		// 	case IClassicDesktopStyleApplicationLifetime desktop:
+		// 		desktop.MainWindow = view as Window;
+		// 		break;
+
+		// 	case ISingleViewApplicationLifetime singleView:
+		// 		singleView.MainView = view as Control;
+		// 		break;
+
+		// 	default:
+		// 		throw new NotSupportedException();
+		// }
+
+		base.OnFrameworkInitializationCompleted();
+	}
+}

app/InkForge.Common/InkForge.Common.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <RootNamespace>InkForge</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Avalonia.ReactiveUI" />
+    <PackageReference Include="Avalonia.Themes.Fluent" />
+    <PackageReference Include="Microsoft.Extensions.Hosting" />
+    <PackageReference Include="Microsoft.Extensions.Http" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\shared\InkForge.Data\InkForge.Data.csproj" />
+    <ProjectReference Include="..\..\shared\migrations\InkForge.Sqlite\InkForge.Sqlite.csproj" />
+  </ItemGroup>
+
+</Project>