激进的更新

LanMountainDesktop.Launcher/Views/OobeWindow.axaml

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+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        x:Class="LanMountainDesktop.Launcher.Views.OobeWindow"
+        Title="阑山桌面"
+        Width="420"
+        Height="260"
+        CanResize="False"
+        WindowStartupLocation="CenterScreen">
+  <Grid Margin="24" RowDefinitions="*,Auto">
+    <TextBlock Text="欢迎使用阑山桌面"
+               FontSize="26"
+               VerticalAlignment="Center"
+               HorizontalAlignment="Center" />
+    <Button Grid.Row="1"
+            x:Name="EnterButton"
+            HorizontalAlignment="Right"
+            Width="64"
+            Height="40"
+            Content="→"
+            FontSize="18" />
+  </Grid>
+</Window>

LanMountainDesktop.Launcher/Views/OobeWindow.axaml.cs

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+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using Avalonia.Markup.Xaml;
+
+namespace LanMountainDesktop.Launcher.Views;
+
+internal partial class OobeWindow : Window
+{
+    private readonly TaskCompletionSource<bool> _completionSource = new();
+
+    public OobeWindow()
+    {
+        AvaloniaXamlLoader.Load(this);
+        var enterButton = this.FindControl<Button>("EnterButton");
+        if (enterButton is not null)
+        {
+            enterButton.Click += OnEnterClick;
+        }
+    }
+
+    public Task WaitForEnterAsync() => _completionSource.Task;
+
+    private void OnEnterClick(object? sender, RoutedEventArgs e)
+    {
+        _completionSource.TrySetResult(true);
+    }
+}

LanMountainDesktop.Launcher/Views/SplashWindow.axaml

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+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        x:Class="LanMountainDesktop.Launcher.Views.SplashWindow"
+        Title="阑山桌面"
+        Width="420"
+        Height="220"
+        CanResize="False"
+        WindowStartupLocation="CenterScreen"
+        SystemDecorations="None">
+  <Grid Margin="24">
+    <TextBlock x:Name="AppNameText"
+               Text="阑山桌面"
+               FontSize="34"
+               VerticalAlignment="Center"
+               HorizontalAlignment="Center" />
+  </Grid>
+</Window>

LanMountainDesktop.Launcher/Views/SplashWindow.axaml.cs

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+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace LanMountainDesktop.Launcher.Views;
+
+internal partial class SplashWindow : Window
+{
+    public SplashWindow()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+}