feat(ui): notes mode in the Details island

Add IsNotesMode/Notes to DetailsIslandViewModel; ShowNotes() loads today's
notes and switches the island body to NotesEditorView via IsVisible toggling.

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

src/ClaudeDo.App/Program.cs

@@ -126,7 +126,8 @@ sealed class Program
             new DetailsIslandViewModel(
                 sp.GetRequiredService<IDbContextFactory<ClaudeDoDbContext>>(),
                 sp.GetRequiredService<WorkerClient>(),
-                sp));
+                sp,
+                sp.GetRequiredService<INotesApi>()));
         sc.AddSingleton<IslandsShellViewModel>();
 
         return sc.BuildServiceProvider();

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

@@ -7,6 +7,7 @@ using ClaudeDo.Data.Models;
 using ClaudeDo.Data.Repositories;
 using ClaudeDo.Ui.Helpers;
 using ClaudeDo.Ui.Services;
+using ClaudeDo.Ui.Services.Interfaces;
 using ClaudeDo.Ui.ViewModels.Modals;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.DependencyInjection;
@@ -49,6 +50,10 @@ public sealed partial class DetailsIslandViewModel : ViewModelBase
     private readonly IDbContextFactory<ClaudeDoDbContext> _dbFactory;
     private readonly IWorkerClient _worker;
     private readonly IServiceProvider _services;
+    private readonly INotesApi _notesApi;
+
+    [ObservableProperty] private bool _isNotesMode;
+    public NotesEditorViewModel Notes { get; private set; } = null!;
 
     // Current task row (set by IslandsShellViewModel via Bind)
     [ObservableProperty]
@@ -233,11 +238,13 @@ public sealed partial class DetailsIslandViewModel : ViewModelBase
         catch { }
     }
 
-    public DetailsIslandViewModel(IDbContextFactory<ClaudeDoDbContext> dbFactory, IWorkerClient worker, IServiceProvider services)
+    public DetailsIslandViewModel(IDbContextFactory<ClaudeDoDbContext> dbFactory, IWorkerClient worker, IServiceProvider services, INotesApi notesApi)
     {
         _dbFactory = dbFactory;
         _worker = worker;
         _services = services;
+        _notesApi = notesApi;
+        Notes = new NotesEditorViewModel(_notesApi);
 
         // Subscribe once; filter by current task id inside the handler
         _worker.TaskMessageEvent += OnTaskMessage;
@@ -431,8 +438,16 @@ public sealed partial class DetailsIslandViewModel : ViewModelBase
         }
     }
 
+    public void ShowNotes()
+    {
+        Bind(null);
+        IsNotesMode = true;
+        _ = Notes.LoadDayAsync(DateOnly.FromDateTime(DateTime.Today));
+    }
+
     public void Bind(TaskRowViewModel? row)
     {
+        IsNotesMode = false;
         _loadCts?.Cancel();
         _loadCts?.Dispose();
         _loadCts = new CancellationTokenSource();

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

@@ -126,8 +126,10 @@
     <!-- ── Agent status strip (sticky, above metadata footer) ── -->
     <islands:AgentStripView DockPanel.Dock="Bottom"/>
 
-    <!-- ── Scrollable body: steps + terminal ── -->
-    <ScrollViewer VerticalScrollBarVisibility="Auto">
+    <!-- ── Body: task details (normal) or notes editor (notes mode) ── -->
+    <Grid>
+    <ScrollViewer VerticalScrollBarVisibility="Auto"
+                  IsVisible="{Binding !IsNotesMode}">
       <StackPanel Spacing="0">
 
         <!-- Planning merge section — visible only for planning parent tasks -->
@@ -293,6 +295,10 @@
 
       </StackPanel>
     </ScrollViewer>
+    <Panel IsVisible="{Binding IsNotesMode}">
+      <islands:NotesEditorView DataContext="{Binding Notes}"/>
+    </Panel>
+    </Grid>
 
   </DockPanel>
 </UserControl>