feat(ui): pinned Notes row in My Day opens the notes editor

Add ShowNotesRow/OpenNotesCommand to TasksIslandViewModel; wire NotesRequested
event to Details.ShowNotes() in the shell; show a Notes button above the task
list when the My Day smart list is active.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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

@@ -25,8 +25,16 @@ public sealed partial class TasksIslandViewModel : ViewModelBase
     public event EventHandler? SelectionChanged;
     public event EventHandler? FocusAddTaskRequested;
     public event EventHandler? TasksChanged;
+    public event Action? NotesRequested;
     public void RequestFocusAddTask() => FocusAddTaskRequested?.Invoke(this, EventArgs.Empty);
 
+    [RelayCommand]
+    private void OpenNotes()
+    {
+        SelectedTask = null;
+        NotesRequested?.Invoke();
+    }
+
     public ObservableCollection<TaskRowViewModel> Items { get; } = new();
     public ObservableCollection<TaskRowViewModel> OverdueItems { get; } = new();
     public ObservableCollection<TaskRowViewModel> OpenItems { get; } = new();
@@ -45,6 +53,7 @@ public sealed partial class TasksIslandViewModel : ViewModelBase
     [ObservableProperty] private bool _hasCompleted;
     [ObservableProperty] private bool _showOpenLabel;
     [ObservableProperty] private string _completedHeader = "COMPLETED";
+    [ObservableProperty] private bool _showNotesRow;
 
     public Func<UnfinishedPlanningModalViewModel, Task>? ShowUnfinishedPlanningModal { get; set; }
 
@@ -176,10 +185,12 @@ public sealed partial class TasksIslandViewModel : ViewModelBase
         HasOpen       = false;
         HasCompleted  = false;
         ShowOpenLabel = false;
+        ShowNotesRow  = false;
         if (list is null) return;
 
         HeaderTitle = list.Name;
         HeaderEyebrow = DateTime.Now.ToString("dddd · MMM dd", CultureInfo.InvariantCulture).ToUpperInvariant();
+        ShowNotesRow = list.Id == "smart:my-day";
 
         _ = LoadForListAsync(list, ct);
     }

src/ClaudeDo.Ui/ViewModels/IslandsShellViewModel.cs

@@ -197,6 +197,7 @@ public sealed partial class IslandsShellViewModel : ViewModelBase
         _repoImportVmFactory = repoImportVmFactory;
         Lists.SelectionChanged += (_, _) => Tasks.LoadForList(Lists.SelectedList);
         Tasks.SelectionChanged += (_, _) => Details.Bind(Tasks.SelectedTask);
+        Tasks.NotesRequested += () => Details.ShowNotes();
         Tasks.TasksChanged     += (_, _) => _ = Lists.RefreshCountsAsync();
         Tasks.OpenListSettingsRequested += (_, _) =>
         {

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

@@ -65,6 +65,14 @@
       </Grid>
     </Border>
 
+    <!-- Notes pinned row (My Day only) -->
+    <Button DockPanel.Dock="Top"
+            Classes="btn" HorizontalAlignment="Stretch" HorizontalContentAlignment="Left"
+            Margin="16,0,16,8"
+            IsVisible="{Binding ShowNotesRow}"
+            Command="{Binding OpenNotesCommand}"
+            Content="Notizen (Tagesnotizen)"/>
+
     <!-- Task list -->
     <ScrollViewer>
       <StackPanel Margin="10,4">