fix simple style

src/Avalonia.Themes.Simple/Controls/CalendarItem.xaml

@@ -176,12 +176,5 @@
     <Style Selector="^:calendardisabled /template/ Rectangle#DisabledVisual">
       <Setter Property="IsVisible" Value="True" />
     </Style>
-    <!-- When week numbers are visible the MonthView is wider than the YearView.
-         Lock CalendarItem's own MinWidth so the size stays stable when switching
-         between month and year/decade views.
-         37px per CalendarButton × 4 cols = 148 + the week-number column (~30px) -->
-    <Style Selector="^:showweeknumbers">
-      <Setter Property="MinWidth" Value="200" />
-    </Style>
   </ControlTheme>
 </ResourceDictionary>

src/Avalonia.Themes.Simple/Controls/CalendarWeekNumberLabel.xaml

@@ -3,8 +3,6 @@
                     x:ClassModifier="internal">
 
   <ControlTheme x:Key="{x:Type CalendarWeekNumberLabel}" TargetType="CalendarWeekNumberLabel">
-    <Setter Property="Margin" Value="0,4,0,4" />
-    <Setter Property="Padding" Value="4,0,6,0" />
     <Setter Property="FontSize" Value="9.5" />
     <Setter Property="FontStyle" Value="Italic" />
     <Setter Property="Foreground" Value="{DynamicResource ThemeForegroundLowBrush}" />