fix(ui): wire details-island buttons and drop dead handlers

- Bind star button to ToggleStarCommand; wrap header and subtask
  done-check ellipses in buttons (ToggleDone / ToggleSubtaskDone).
- Wire AgentStrip copy-path button to clipboard handler.
- Remove dead Notes/PromptInput/ApproveMerge/ShowWorktreeModal code
  with no UI bindings.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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

@@ -81,6 +81,7 @@
         <Button Grid.Column="2"
                 Classes="icon-btn"
                 ToolTip.Tip="Copy path"
+                Click="OnCopyWorktreePathClick"
                 VerticalAlignment="Center">
           <PathIcon Data="{StaticResource Icon.Copy}" Width="11" Height="11"/>
         </Button>

src/ClaudeDo.Ui/Views/Islands/AgentStripView.axaml.cs

@@ -1,8 +1,19 @@
 using Avalonia.Controls;
+using Avalonia.Input.Platform;
+using Avalonia.Interactivity;
+using ClaudeDo.Ui.ViewModels.Islands;
 
 namespace ClaudeDo.Ui.Views.Islands;
 
 public partial class AgentStripView : UserControl
 {
     public AgentStripView() { InitializeComponent(); }
+
+    private async void OnCopyWorktreePathClick(object? sender, RoutedEventArgs e)
+    {
+        if (DataContext is not DetailsIslandViewModel vm) return;
+        var clipboard = TopLevel.GetTopLevel(this)?.Clipboard;
+        if (clipboard is null || string.IsNullOrEmpty(vm.WorktreePath)) return;
+        await clipboard.SetTextAsync(vm.WorktreePath);
+    }
 }

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

@@ -38,13 +38,16 @@
     <!-- ── Header (sticky top): check · eyebrow · title · status · star · gear ── -->
     <Border DockPanel.Dock="Top" Classes="island-header">
       <Grid ColumnDefinitions="Auto,*,Auto,Auto">
-        <Ellipse Grid.Column="0"
-                 Classes="task-check"
-                 Classes.done="{Binding Task.Done}"
-                 Width="18" Height="18"
-                 VerticalAlignment="Top"
-                 Margin="0,2,10,0"
-                 Cursor="Hand"/>
+        <Button Grid.Column="0" Classes="flat"
+                Command="{Binding ToggleDoneCommand}"
+                Padding="0"
+                VerticalAlignment="Top"
+                Margin="0,2,10,0">
+          <Ellipse Classes="task-check"
+                   Classes.done="{Binding Task.Done}"
+                   Width="18" Height="18"
+                   Cursor="Hand"/>
+        </Button>
         <StackPanel Grid.Column="1" Spacing="0">
           <TextBlock Text="{Binding TaskIdBadge}"
                      FontFamily="{DynamicResource MonoFont}" FontSize="10"
@@ -62,6 +65,8 @@
         <Button Grid.Column="2"
                 Classes="icon-btn star-btn"
                 Classes.on="{Binding Task.IsStarred}"
+                Command="{Binding ToggleStarCommand}"
+                ToolTip.Tip="Star"
                 VerticalAlignment="Top"
                 Margin="6,0,0,0">
           <PathIcon Data="{StaticResource Icon.Star}" Width="14" Height="14"/>
@@ -176,13 +181,17 @@
                   <Border Classes="subtask-row"
                           Classes.done="{Binding Done}">
                     <Grid ColumnDefinitions="Auto,*">
-                      <Ellipse Grid.Column="0"
-                               Classes="task-check"
-                               Classes.done="{Binding Done}"
-                               Width="16" Height="16"
-                               VerticalAlignment="Center"
-                               Cursor="Hand"
-                               Margin="0,0,8,0"/>
+                      <Button Grid.Column="0" Classes="flat"
+                              Padding="0"
+                              Margin="0,0,8,0"
+                              VerticalAlignment="Center"
+                              Command="{Binding $parent[ItemsControl].((vm:DetailsIslandViewModel)DataContext).ToggleSubtaskDoneCommand}"
+                              CommandParameter="{Binding}">
+                        <Ellipse Classes="task-check"
+                                 Classes.done="{Binding Done}"
+                                 Width="16" Height="16"
+                                 Cursor="Hand"/>
+                      </Button>
                       <TextBlock Grid.Column="1"
                                  Classes="subtask-title"
                                  Text="{Binding Title}"

src/ClaudeDo.Ui/Views/Islands/DetailsIslandView.axaml.cs

@@ -30,14 +30,6 @@ public partial class DetailsIslandView : UserControl
                 await modal.ShowDialog(owner);
             };
 
-            vm.ShowWorktreeModal = async (worktreeVm) =>
-            {
-                var owner = TopLevel.GetTopLevel(this) as Window;
-                if (owner == null) return;
-                var modal = new WorktreeModalView { DataContext = worktreeVm };
-                await modal.ShowDialog(owner);
-            };
-
             vm.ShowMergeModal = async (mergeVm) =>
             {
                 var owner = TopLevel.GetTopLevel(this) as Window;
@@ -143,12 +135,6 @@ public partial class DetailsIslandView : UserControl
         return await tcs.Task;
     }
 
-    private void NotesLostFocus(object? sender, RoutedEventArgs e)
-    {
-        if (DataContext is DetailsIslandViewModel vm)
-            vm.SaveNotesCommand.Execute(null);
-    }
-
     private async void OnCopyDescriptionClick(object? sender, RoutedEventArgs e)
     {
         if (DataContext is not DetailsIslandViewModel vm) return;