Sidebar - Added subitems support

src/Artemis.UI/Screens/Workshop/Layout/LayoutDetailsView.axaml

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+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             xmlns:controls="clr-namespace:FluentAvalonia.UI.Controls;assembly=FluentAvalonia"
+             xmlns:ui="clr-namespace:Artemis.UI"
+             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+             x:Class="Artemis.UI.Screens.Workshop.Layout.LayoutDetailsView">
+    <Border Classes="router-container">
+        <Grid ColumnDefinitions="300,*" Margin="10">
+            <Border Classes="card-condensed" Grid.Column="0" Margin="0 0 10 0">
+                <TextBlock>Side panel</TextBlock>
+            </Border>
+
+            <Border Classes="card-condensed" Grid.Column="1">
+                <TextBlock>Main panel</TextBlock>
+            </Border>
+        </Grid>
+    </Border>
+   
+</UserControl>

src/Artemis.UI/Screens/Workshop/Layout/LayoutDetailsView.axaml.cs

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+using Avalonia.Markup.Xaml;
+using Avalonia.ReactiveUI;
+
+namespace Artemis.UI.Screens.Workshop.Layout;
+
+public partial class LayoutDetailsView : ReactiveUserControl<LayoutDetailsViewModel>
+{
+    public LayoutDetailsView()
+    {
+        InitializeComponent();
+    }
+
+    private void InitializeComponent()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+}

src/Artemis.UI/Screens/Workshop/Layout/LayoutDetailsViewModel.cs

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+using Artemis.UI.Shared;
+
+namespace Artemis.UI.Screens.Workshop.Layout;
+
+public class LayoutDetailsViewModel : ActivatableViewModelBase
+{
+    
+}

src/Artemis.UI/Screens/Workshop/Layout/LayoutListView.axaml

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+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             xmlns:layout="clr-namespace:Artemis.UI.Screens.Workshop.Layout"
+             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+             x:Class="Artemis.UI.Screens.Workshop.Layout.LayoutListView"
+             x:DataType="layout:LayoutListViewModel">
+    <Border Classes="router-container">
+        <Grid ColumnDefinitions="300,*" Margin="10">
+            <Border Classes="card-condensed" Grid.Column="0" Margin="0 0 10 0">
+                <TextBlock>Side panel</TextBlock>
+            </Border>
+
+            <Border Classes="card-condensed" Grid.Column="1">
+                <TextBlock>
+                    <Run Text="Layout list main panel, page: " /><Run Text="{CompiledBinding Page}"></Run>
+                </TextBlock>
+            </Border>
+        </Grid>
+    </Border>
+</UserControl>

src/Artemis.UI/Screens/Workshop/Layout/LayoutListView.axaml.cs

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+using Avalonia.Markup.Xaml;
+using Avalonia.ReactiveUI;
+
+namespace Artemis.UI.Screens.Workshop.Layout;
+
+public partial class LayoutListView : ReactiveUserControl<LayoutListViewModel>
+{
+    public LayoutListView()
+    {
+        InitializeComponent();
+    }
+
+    private void InitializeComponent()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+}

src/Artemis.UI/Screens/Workshop/Layout/LayoutListViewModel.cs

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+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using Artemis.UI.Shared;
+using Artemis.UI.Shared.Routing;
+
+namespace Artemis.UI.Screens.Workshop.Layout;
+
+public class LayoutListViewModel : RoutableScreen<ActivatableViewModelBase, WorkshopListParameters>, IMainScreenViewModel
+{
+    private int _page;
+
+    public int Page
+    {
+        get => _page;
+        set => RaiseAndSetIfChanged(ref _page, value);
+    }
+
+    public override Task OnNavigating(WorkshopListParameters parameters, NavigationArguments args, CancellationToken cancellationToken)
+    {
+        Page = Math.Max(1, parameters.Page);
+        return Task.CompletedTask;
+    }
+
+    public ViewModelBase? TitleBarViewModel => null;
+}