feat(ui): searchable Material Design icon library for lists and folders

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

@@ -143,8 +143,13 @@
           <ScrollViewer>
             <StackPanel Spacing="8" Margin="0,8,0,0">
               <TextBlock Classes="field-label" Text="{loc:Tr modals.listSettings.icon}"/>
+              <TextBox Text="{Binding IconSearch}"
+                       Watermark="{loc:Tr modals.listSettings.iconSearchWatermark}"/>
+              <TextBlock Text="{loc:Tr modals.listSettings.iconSearchTruncated}"
+                         IsVisible="{Binding IconResultsTruncated}"
+                         Opacity="0.6" FontSize="12" TextWrapping="Wrap"/>
               <ListBox ItemsSource="{Binding Icons}"
-                       SelectedItem="{Binding Icon, Mode=TwoWay}"
+                       SelectedItem="{Binding SelectedIconOption, Mode=TwoWay}"
                        Background="Transparent" BorderThickness="0"
                        HorizontalAlignment="Left">
                 <ListBox.ItemsPanel>
@@ -157,6 +162,7 @@
                     <!-- No Foreground here on purpose: the icon inherits the container's, so the
                          selected/hover states of ListBoxItem reach it (see Ui/CLAUDE.md). -->
                     <PathIcon Width="20" Height="20" Margin="6"
+                              ToolTip.Tip="{Binding}"
                               Data="{Binding Converter={StaticResource IconKey}}"/>
                   </DataTemplate>
                 </ListBox.ItemTemplate>