feat(ui): merge Tokens and IslandStyles into App

src/ClaudeDo.App/App.axaml

@@ -5,6 +5,11 @@
              RequestedThemeVariant="Dark">
 
     <Application.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <ResourceInclude Source="avares://ClaudeDo.Ui/Design/Tokens.axaml" />
+            </ResourceDictionary.MergedDictionaries>
+
             <!-- Accent: Forest Teal -->
             <SolidColorBrush x:Key="AccentBrush" Color="#3d9474"/>
             <SolidColorBrush x:Key="AccentLightBrush" Color="#6bb89e"/>
@@ -29,6 +34,7 @@
             <SolidColorBrush x:Key="StatusOrangeBrush" Color="#e67e22"/>
             <SolidColorBrush x:Key="StatusGreenBrush" Color="#3d9474"/>
             <SolidColorBrush x:Key="StatusRedBrush" Color="#ef4444"/>
+        </ResourceDictionary>
     </Application.Resources>
 
     <Application.DataTemplates>
@@ -37,6 +43,7 @@
 
     <Application.Styles>
         <FluentTheme />
+        <StyleInclude Source="avares://ClaudeDo.Ui/Design/IslandStyles.axaml" />
         <Style Selector="ListBoxItem:selected /template/ ContentPresenter">
             <Setter Property="Background" Value="#333d9474"/>
         </Style>