Merge task: UI polish: ListBox Padding scroll clip, 4s log rebuild, ClassifyItems side effects

src/ClaudeDo.Ui/Views/Islands/TasksIslandView.axaml

@@ -91,15 +91,17 @@
 
     <!-- Task list: one flat, virtualized ListBox. Rows is HeaderRow | TaskRowViewModel — group
          headers are regular entries, not a separate ItemsControl per section, so a
-         VirtualizingStackPanel actually bounds the realized container count. -->
+         VirtualizingStackPanel actually bounds the realized container count.
+         Inset lives on the panel, NOT on the ListBox: Avalonia 12 leaves ScrollViewer.Padding
+         out of the Extent, so at max scroll the last row would sit below the viewport and stay
+         unreachable. -->
     <ListBox x:Name="RowsListBox"
              ItemsSource="{Binding Rows}"
              Background="Transparent"
-             BorderThickness="0"
-             Padding="10,4">
+             BorderThickness="0">
       <ListBox.ItemsPanel>
         <ItemsPanelTemplate>
-          <VirtualizingStackPanel/>
+          <VirtualizingStackPanel Margin="10,4"/>
         </ItemsPanelTemplate>
       </ListBox.ItemsPanel>
       <ListBox.Styles>