create viewmodels for RepositoryWindow that can be swapped when locking/unlocking

src/KeyKeeper/RepositoryWindow.axaml

@@ -1,11 +1,15 @@
 <Window xmlns="https://github.com/avaloniaui"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:vm="using:KeyKeeper.ViewModels"
         x:Class="KeyKeeper.RepositoryWindow"
         Title="KeyKeeper - Хранилище паролей"
         Width="800"
         Height="600"
-        Background="White">
+        Background="White"
+        x:DataType="vm:RepositoryWindowViewModel">
 
+        <Window.DataTemplates>
+            <DataTemplate DataType="{x:Type vm:UnlockedRepositoryViewModel}">
                 <Grid>
                     <!-- Синий левый край -->
                     <Border Width="200" 
@@ -46,4 +50,11 @@
                                 Margin="0,20,0,0"/>
                     </StackPanel>
                 </Grid>
+            </DataTemplate>
+            <DataTemplate DataType="{x:Type vm:LockedRepositoryViewModel}">
+                
+            </DataTemplate>
+        </Window.DataTemplates>
+
+        <ContentControl Content="{Binding CurrentPage}"/>
 </Window>

src/KeyKeeper/RepositoryWindow.axaml.cs

@@ -1,7 +1,5 @@
 using System;
-using Avalonia;
 using Avalonia.Controls;
-using Avalonia.Markup.Xaml;
 using KeyKeeper.PasswordStore;
 using KeyKeeper.PasswordStore.Crypto;
 

src/KeyKeeper/ViewModels/LockedRepositoryViewModel.cs

@@ -0,0 +1,5 @@
+namespace KeyKeeper.ViewModels;
+
+public class LockedRepositoryViewModel : ViewModelBase
+{
+}

src/KeyKeeper/ViewModels/RepositoryWindowViewModel.cs

@@ -0,0 +1,11 @@
+namespace KeyKeeper.ViewModels;
+
+public class RepositoryWindowViewModel : ViewModelBase
+{
+    private object currentPage = new LockedRepositoryViewModel();
+    public object CurrentPage
+    {
+        get => currentPage;
+        set { currentPage = value; OnPropertyChanged(nameof(CurrentPage)); }
+    }
+}

src/KeyKeeper/ViewModels/UnlockedRepositoryViewModel.cs

@@ -0,0 +1,5 @@
+namespace KeyKeeper.ViewModels;
+
+public class UnlockedRepositoryViewModel : ViewModelBase
+{
+}

src/KeyKeeper/Views/MainWindow.axaml.cs

@@ -84,7 +84,7 @@ namespace KeyKeeper.Views
         {
             var repositoryWindow = new RepositoryWindow()
             {
-                DataContext = this.DataContext,
+                DataContext = new RepositoryWindowViewModel(),
                 PassStore = store,
                 WindowStartupLocation = WindowStartupLocation.CenterScreen
             };