feat(ui): mark agent-suggested improvement children in the task tree

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

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

@@ -136,6 +136,13 @@
                       IsVisible="{Binding HasRoadblock}"
                       ToolTip.Tip="{Binding RoadblockTooltip}"/>
 
+            <!-- Agent-suggested badge -->
+            <PathIcon Width="10" Height="10" VerticalAlignment="Center"
+                      Data="{StaticResource Icon.AgentSuggested}"
+                      Foreground="#5C8FA8"
+                      IsVisible="{Binding IsAgentSuggested}"
+                      ToolTip.Tip="Suggested by the agent"/>
+
             <!-- Status chip -->
             <Border Classes="chip"
                     Classes.running="{Binding Status, Converter={StaticResource EqStatus}, ConverterParameter=Running}"