refactor(ui): render worktree modal diff via canonical DiffLinesView

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

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

@@ -2,6 +2,7 @@
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:vm="using:ClaudeDo.Ui.ViewModels.Modals"
         xmlns:converters="using:ClaudeDo.Ui.Converters"
+        xmlns:ctl="using:ClaudeDo.Ui.Views.Controls"
         xmlns:loc="using:ClaudeDo.Ui.Localization"
         x:Class="ClaudeDo.Ui.Views.Modals.WorktreeModalView"
         x:DataType="vm:WorktreeModalViewModel"
@@ -16,10 +17,6 @@
         CanResize="True"
         TransparencyLevelHint="AcrylicBlur">
 
-  <Window.Resources>
-    <converters:DiffLineKindToBrushConverter x:Key="DiffLineKindToBrush"/>
-  </Window.Resources>
-
   <Window.KeyBindings>
     <KeyBinding Gesture="Escape" Command="{Binding CloseCommand}"/>
   </Window.KeyBindings>
@@ -89,17 +86,7 @@
                       HorizontalScrollBarVisibility="Auto"
                       VerticalScrollBarVisibility="Auto"
                       Margin="4,0,8,8">
-          <ItemsControl ItemsSource="{Binding SelectedFileDiffLines}">
-            <ItemsControl.ItemTemplate>
-              <DataTemplate DataType="vm:WorktreeDiffLineViewModel">
-                <SelectableTextBlock Text="{Binding Text}"
-                                     FontFamily="{DynamicResource MonoFont}"
-                                     FontSize="{StaticResource FontSizeMono}"
-                                     Foreground="{Binding Kind, Converter={StaticResource DiffLineKindToBrush}}"
-                                     TextWrapping="NoWrap"/>
-              </DataTemplate>
-            </ItemsControl.ItemTemplate>
-          </ItemsControl>
+          <ctl:DiffLinesView Lines="{Binding SelectedFileDiffLines}"/>
         </ScrollViewer>
 
       </Grid>