show username under the entry name

src/KeyKeeper/PasswordStore/LoginField.cs

@@ -7,7 +7,7 @@ public struct LoginField
 {
     public byte Type;
     public Guid CustomFieldSubtype;
-    public required string Value;
+    public required string Value { get; set; }
 
     public override string ToString()
     {

src/KeyKeeper/Views/RepositoryWindow.axaml

@@ -79,6 +79,9 @@
                                         <TextBlock Text="{Binding Name}"
                                                 HorizontalAlignment="Center"
                                                 Foreground="Black" />
+                                        <TextBlock Text="{Binding Password.Value}" 
+                                                   Foreground="#666"
+                                                   HorizontalAlignment="Center" />
                                     </StackPanel>
                                 </Border>
                             </DataTemplate>