feat(ui): wire redesigned detail island (header + description/steps card + work console)

Replace the long scrolling DetailsIslandView with the new pinned layout: a
separated TaskHeaderBar (trash↔skull, gear), a DescriptionStepsCard (text⇄steps
toggle, Preview = composed prompt), and a pinned WorkConsole (Output/Actions/
Session tabs). The three components now bind to DetailsIslandViewModel; their
scaffolding sample VMs are removed. Drops the old inline sections + AgentStripView.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/ClaudeDo.Ui/Views/Islands/Detail/TaskHeaderBar.axaml

@@ -1,14 +1,10 @@
 <UserControl xmlns="https://github.com/avaloniaui"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-             xmlns:vm="using:ClaudeDo.Ui.ViewModels.Islands.Detail"
+             xmlns:vm="using:ClaudeDo.Ui.ViewModels.Islands"
              xmlns:ctl="using:ClaudeDo.Ui.Views.Controls"
              xmlns:loc="using:ClaudeDo.Ui.Localization"
              x:Class="ClaudeDo.Ui.Views.Islands.Detail.TaskHeaderBar"
-             x:DataType="vm:TaskHeaderBarViewModel">
-
-  <Design.DataContext>
-    <vm:TaskHeaderBarViewModel/>
-  </Design.DataContext>
+             x:DataType="vm:DetailsIslandViewModel">
 
   <Grid ColumnDefinitions="*,Auto,Auto">
 
@@ -17,7 +13,9 @@
       <TextBlock Classes="meta"
                  Text="{Binding TaskIdBadge}"
                  Margin="0,0,0,4"
-                 Cursor="Hand"/>
+                 Cursor="Hand"
+                 ToolTip.Tip="{loc:Tr details.copyTaskIdTip}"
+                 Tapped="OnTaskIdTapped"/>
       <TextBox Text="{Binding EditableTitle, Mode=TwoWay}"
                Background="Transparent"
                BorderThickness="0"
@@ -42,7 +40,7 @@
 
     <!-- Column 1: skull button (running) -->
     <Button Grid.Column="1" Classes="icon-btn"
-            Command="{Binding KillSessionCommand}"
+            Command="{Binding StopCommand}"
             ToolTip.Tip="Kill session"
             IsVisible="{Binding IsRunning}"
             VerticalAlignment="Top"