feat(ui): scaffold islands shell and child VMs

src/ClaudeDo.App/Program.cs

@@ -5,6 +5,7 @@ using ClaudeDo.Data.Repositories;
 using ClaudeDo.Ui;
 using ClaudeDo.Ui.Services;
 using ClaudeDo.Ui.ViewModels;
+using ClaudeDo.Ui.ViewModels.Islands;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.DependencyInjection;
 using System;
@@ -100,6 +101,12 @@ sealed class Program
                 () => sp.GetRequiredService<ListEditorViewModel>());
         });
 
+        // Islands shell VMs
+        sc.AddSingleton<ListsIslandViewModel>();
+        sc.AddSingleton<TasksIslandViewModel>();
+        sc.AddSingleton<DetailsIslandViewModel>();
+        sc.AddSingleton<IslandsShellViewModel>();
+
         return sc.BuildServiceProvider();
     }
 }

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

@@ -0,0 +1,9 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace ClaudeDo.Ui.ViewModels.Islands;
+
+public sealed partial class DetailsIslandViewModel : ViewModelBase
+{
+    [ObservableProperty] private TaskRowViewModel? _task;
+    public void Bind(TaskRowViewModel? task) => Task = task;
+}

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

@@ -0,0 +1,12 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace ClaudeDo.Ui.ViewModels.Islands;
+
+public sealed partial class ListNavItemViewModel : ViewModelBase
+{
+    public required string Id { get; init; }
+    public required string Name { get; init; }
+    [ObservableProperty] private int _count;
+    [ObservableProperty] private bool _isActive;
+    public string? IconKey { get; init; }
+}

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

@@ -0,0 +1,11 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace ClaudeDo.Ui.ViewModels.Islands;
+
+public sealed partial class ListsIslandViewModel : ViewModelBase
+{
+    public event EventHandler? SelectionChanged;
+    [ObservableProperty] private ListNavItemViewModel? _selectedList;
+    partial void OnSelectedListChanged(ListNavItemViewModel? value) =>
+        SelectionChanged?.Invoke(this, EventArgs.Empty);
+}

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

@@ -0,0 +1,10 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace ClaudeDo.Ui.ViewModels.Islands;
+
+public sealed partial class TaskRowViewModel : ViewModelBase
+{
+    public required string Id { get; init; }
+    [ObservableProperty] private string _title = "";
+    [ObservableProperty] private bool _done;
+}

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

@@ -0,0 +1,12 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+
+namespace ClaudeDo.Ui.ViewModels.Islands;
+
+public sealed partial class TasksIslandViewModel : ViewModelBase
+{
+    public event EventHandler? SelectionChanged;
+    [ObservableProperty] private TaskRowViewModel? _selectedTask;
+    public void LoadForList(ListNavItemViewModel? list) { /* Phase 5 */ }
+    partial void OnSelectedTaskChanged(TaskRowViewModel? value) =>
+        SelectionChanged?.Invoke(this, EventArgs.Empty);
+}

src/ClaudeDo.Ui/ViewModels/IslandsShellViewModel.cs

@@ -0,0 +1,33 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+using ClaudeDo.Ui.ViewModels.Islands;
+
+namespace ClaudeDo.Ui.ViewModels;
+
+public sealed partial class IslandsShellViewModel : ViewModelBase
+{
+    public ListsIslandViewModel Lists { get; }
+    public TasksIslandViewModel Tasks { get; }
+    public DetailsIslandViewModel Details { get; }
+
+    [ObservableProperty]
+    private double _windowWidth = 1280;
+
+    public bool ShowDetails => WindowWidth >= 1100;
+    public bool ShowLists => WindowWidth >= 780;
+
+    partial void OnWindowWidthChanged(double value)
+    {
+        OnPropertyChanged(nameof(ShowDetails));
+        OnPropertyChanged(nameof(ShowLists));
+    }
+
+    public IslandsShellViewModel(
+        ListsIslandViewModel lists,
+        TasksIslandViewModel tasks,
+        DetailsIslandViewModel details)
+    {
+        Lists = lists; Tasks = tasks; Details = details;
+        Lists.SelectionChanged += (_, _) => Tasks.LoadForList(Lists.SelectedList);
+        Tasks.SelectionChanged += (_, _) => Details.Bind(Tasks.SelectedTask);
+    }
+}