fix(notes): let Shift+Enter break the line, and clear the leftovers around the editor

Shift+Enter did nothing because AcceptsReturn was only set from a style
setter and never reached the box. Setting it on the element is half the
fix: TextBox.OnKeyDown consumes Enter regardless of modifiers and runs
before any bubbling handler, so the split chain would have died in its
place. Enter is now taken in the tunnel phase and Shift+Enter is left to
the box.

Alongside, the notes list stops borrowing furniture it has no use for:
no "0 open tasks" subtitle, no show-completed and list-settings buttons,
and no details pane beside it — the editor spans that column instead of
leaving it empty.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/ClaudeDo.Ui/ViewModels/Islands/TasksIslandViewModel.cs

@@ -808,7 +808,8 @@ public sealed partial class TasksIslandViewModel : ViewModelBase, IDisposable
         var running = Items.Count(i => i.Status == TaskStatus.Running);
         var review  = Items.Count(i => i.Status == TaskStatus.Done && i.Branch != null);
 
-        Subtitle = open == 1 ? "1 open task" : $"{open} open tasks";
+        // The notes list holds no tasks — an "0 open tasks" line under its header is just noise.
+        Subtitle = IsNotesList ? "" : open == 1 ? "1 open task" : $"{open} open tasks";
 
         if (running > 0 || review > 0)
         {

src/ClaudeDo.Ui/ViewModels/IslandsShellViewModel.cs

@@ -145,7 +145,14 @@ public sealed partial class IslandsShellViewModel : ViewModelBase, IDisposable
     [ObservableProperty]
     private bool _isWorkerLogVisible;
 
-    public bool ShowDetails => WindowWidth >= 1100;
+    /// <summary>The notes list has nothing to show a detail pane for, so the pane goes away and
+    /// the editor takes the space instead of leaving an empty column beside it.</summary>
+    public bool ShowDetails => WindowWidth >= 1100 && Tasks?.IsNotesList != true;
+
+    /// <summary>Widens the tasks island over the splitter and the details column when that column
+    /// is hidden — a fixed-width ColumnDefinition keeps its space even with an invisible child.</summary>
+    public int TasksColumnSpan => ShowDetails ? 1 : 3;
+
     public bool ShowLists => WindowWidth >= 780;
 
     private readonly System.Timers.Timer _clearTimer = new(30_000) { AutoReset = false };
@@ -168,10 +175,16 @@ public sealed partial class IslandsShellViewModel : ViewModelBase, IDisposable
 
     partial void OnWindowWidthChanged(double value)
     {
-        OnPropertyChanged(nameof(ShowDetails));
+        NotifyDetailsVisibility();
         OnPropertyChanged(nameof(ShowLists));
     }
 
+    private void NotifyDetailsVisibility()
+    {
+        OnPropertyChanged(nameof(ShowDetails));
+        OnPropertyChanged(nameof(TasksColumnSpan));
+    }
+
     public void OnWorkerLogReceived(WorkerLogEntry entry)
     {
         var hhmm = entry.TimestampUtc.ToLocalTime().ToString("HH:mm");
@@ -341,6 +354,10 @@ public sealed partial class IslandsShellViewModel : ViewModelBase, IDisposable
         Lists.SelectionChanged += (_, _) => _ = RefreshStaleWorkerCheckAsync();
         Tasks.SelectionChanged += (_, _) => Details.Bind(Tasks.SelectedTask, Tasks.SelectionSource);
         Tasks.PrepRequested += () => Details.ShowPrep();
+        Tasks.PropertyChanged += (_, e) =>
+        {
+            if (e.PropertyName == nameof(TasksIslandViewModel.IsNotesList)) NotifyDetailsVisibility();
+        };
         Tasks.ErrorReported += FlashFooterError;
         Lists.ErrorReported += FlashFooterError;
         Lists.SuccessReported += FlashFooterSuccess;

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

@@ -13,8 +13,6 @@
       <Setter Property="BorderThickness" Value="0"/>
       <Setter Property="Padding" Value="4,3"/>
       <Setter Property="MinHeight" Value="0"/>
-      <Setter Property="AcceptsReturn" Value="True"/>
-      <Setter Property="TextWrapping" Value="Wrap"/>
     </Style>
     <Style Selector="TextBox.note /template/ Border#PART_BorderElement">
       <Setter Property="Background" Value="Transparent"/>
@@ -77,8 +75,13 @@
                   <Ellipse Grid.Column="0" Width="4" Height="4" Margin="0,0,10,0"
                            VerticalAlignment="Center"
                            Fill="{DynamicResource TextFaintBrush}"/>
+                  <!-- AcceptsReturn/TextWrapping are set here, not in the style above: TextBox
+                       reads AcceptsReturn in its own OnKeyDown, which runs before any handler a
+                       style or the XAML could attach. Enter is intercepted in the tunnel phase
+                       (see code-behind) so the split still wins over the newline. -->
                   <TextBox Grid.Column="1" Classes="note" Text="{Binding Text, Mode=TwoWay}"
-                           LostFocus="OnBulletLostFocus" KeyDown="OnBulletKeyDown"/>
+                           AcceptsReturn="True" TextWrapping="Wrap"
+                           LostFocus="OnBulletLostFocus"/>
                   <PathIcon Grid.Column="2" Width="12" Height="12" Margin="6,0"
                             VerticalAlignment="Center"
                             IsVisible="{Binding FromAgent}"

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

@@ -15,6 +15,10 @@ public partial class NotesEditorView : UserControl
     {
         InitializeComponent();
         DataContextChanged += OnDataContextChanged;
+        // Tunnel, not bubble: with AcceptsReturn on, TextBox.OnKeyDown consumes Enter (any
+        // modifier) before a bubbling handler ever sees it. Taking Enter in the tunnel phase
+        // keeps the split chain, and letting Shift+Enter through leaves the newline to the box.
+        AddHandler(KeyDownEvent, OnBulletKeyDown, RoutingStrategies.Tunnel);
     }
 
     private void OnDataContextChanged(object? sender, EventArgs e)
@@ -33,7 +37,9 @@ public partial class NotesEditorView : UserControl
 
     private void OnBulletKeyDown(object? sender, KeyEventArgs e)
     {
-        if (sender is not TextBox { DataContext: NoteBulletViewModel bullet } box
+        // Source, not sender: the tunnel handler is attached to the whole view, so this also sees
+        // keys from the capture box at the top — which has no bullet behind it and is skipped.
+        if (e.Source is not TextBox { DataContext: NoteBulletViewModel bullet } box
             || DataContext is not NotesEditorViewModel vm) return;
 
         // Shift+Enter falls through to the TextBox and breaks the line — a note can be several.

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

@@ -31,6 +31,7 @@
             <TextBlock Text="{Binding StatusPill}"/>
           </Border>
           <Button Classes="icon-btn" Classes.active="{Binding IsShowingCompleted}"
+                  IsVisible="{Binding !IsNotesList}"
                   Command="{Binding ToggleShowCompletedCommand}"
                   ToolTip.Tip="{loc:Tr tasks.showCompletedTip}">
             <PathIcon Width="15" Height="15" Data="{StaticResource Icon.Eye}"/>
@@ -60,7 +61,8 @@
               <Path Classes="icon-stroke" Data="{StaticResource Icon.PlanDay}"/>
             </Viewbox>
           </Button>
-          <Button Classes="icon-btn" Command="{Binding OpenListSettingsCommand}" ToolTip.Tip="{loc:Tr tasks.listSettingsTip}">
+          <Button Classes="icon-btn" IsVisible="{Binding !IsNotesList}"
+                  Command="{Binding OpenListSettingsCommand}" ToolTip.Tip="{loc:Tr tasks.listSettingsTip}">
             <PathIcon Width="15" Height="15" Data="{StaticResource Icon.Settings}"/>
           </Button>
         </StackPanel>

src/ClaudeDo.Ui/Views/MainWindow.axaml

@@ -144,7 +144,7 @@
                     ResizeDirection="Columns"
                     ResizeBehavior="PreviousAndNext"/>
 
-      <Border Grid.Column="2" Classes="island" Margin="3">
+      <Border Grid.Column="2" Grid.ColumnSpan="{Binding TasksColumnSpan}" Classes="island" Margin="3">
         <islands:TasksIslandView DataContext="{Binding Tasks}"/>
       </Border>