fix(ui): toggle expand on full folder row click

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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

@@ -59,6 +59,7 @@
           <TreeView.ItemTemplate>
             <TreeDataTemplate DataType="vm:WorktreeNodeViewModel"
                               ItemsSource="{Binding Children}">
+              <Border Background="Transparent" Tapped="OnNodeTapped" Cursor="Hand">
               <StackPanel Orientation="Horizontal" Spacing="8">
                 <TextBlock Text="{Binding Name}"
                            FontFamily="{DynamicResource MonoFont}" FontSize="12"
@@ -71,6 +72,7 @@
                              Foreground="{DynamicResource TextBrush}"/>
                 </Border>
               </StackPanel>
+              </Border>
             </TreeDataTemplate>
           </TreeView.ItemTemplate>
         </TreeView>