feat(ui): show newest log entries first in Log Visualizer

Reverses row order in LogVisualizerViewModel.Apply() so the most recent
entry sits at index 0, matching the "what just happened" use case;
filtering and refresh are unaffected since the reversal happens after
the warn/error filter is applied.

src/ClaudeDo.Ui/Views/Modals/LogVisualizerView.axaml

@@ -36,7 +36,7 @@
                 Command="{Binding RefreshCommand}"/>
       </Grid>
 
-      <!-- Last 30 min, oldest-first -->
+      <!-- Last 30 min, newest-first -->
       <Border Classes="terminal" Margin="14,0,14,14">
         <ScrollViewer VerticalScrollBarVisibility="Visible" AllowAutoHide="False" Padding="10,8">
           <ItemsControl ItemsSource="{Binding Rows}">