feat(ui): add delete-list button to List Settings modal

src/ClaudeDo.Ui/CLAUDE.md

@@ -17,7 +17,7 @@ MVVM with CommunityToolkit.Mvvm source generators:
 - **TaskEditorView** — Modal dialog for task create/edit
 - **ListEditorView** — Modal dialog for list create/edit
 - **StatusBarView** — Connection status indicator, active task display
-- **ListSettingsModalView** — edits list name, working dir, default commit type, and per-list Model/SystemPrompt/AgentPath. Opened via context menu or gear button on a list row.
+- **ListSettingsModalView** — edits list name, working dir, default commit type, and per-list Model/SystemPrompt/AgentPath; also deletes the list (and its tasks) via a confirmed "Delete list" button. Opened via context menu or gear button on a list row.
 - **RepoImportModalView** — bulk-creates lists from git repos discovered under chosen parent folders. Opened via the folder button beside "New list" in the Lists island, or the "Add repos as lists…" Help-menu item. Repos already wired to a list show as disabled/"(already added)".
 - **DetailsIslandView** — contains an "Agent settings (overrides)" expander with per-task Model/SystemPrompt/AgentPath, showing inherited effective values. Disabled while task is running.
 

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

@@ -48,7 +48,8 @@ public sealed partial class ListsIslandViewModel : ViewModelBase
         var vm = _services.GetRequiredService<ListSettingsModalViewModel>();
         await vm.LoadAsync(rawId, row.Name, row.WorkingDir, row.DefaultCommitType);
         await ShowListSettingsModal(vm);
-        await RefreshRowAsync(row.Id);
+        if (vm.Deleted) await LoadAsync();
+        else await RefreshRowAsync(row.Id);
     }
 
     [RelayCommand]
@@ -225,7 +226,8 @@ public sealed partial class ListsIslandViewModel : ViewModelBase
             var vm = _services.GetRequiredService<ListSettingsModalViewModel>();
             await vm.LoadAsync(entity.Id, entity.Name, entity.WorkingDir, entity.DefaultCommitType);
             await ShowListSettingsModal(vm);
-            await RefreshRowAsync(item.Id);
+            if (vm.Deleted) await LoadAsync();
+            else await RefreshRowAsync(item.Id);
         }
     }
 

src/ClaudeDo.Ui/ViewModels/Modals/ListSettingsModalViewModel.cs

@@ -1,17 +1,28 @@
 using System.Collections.ObjectModel;
+using ClaudeDo.Data;
 using ClaudeDo.Data.Models;
+using ClaudeDo.Data.Repositories;
 using ClaudeDo.Ui.Services;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
+using Microsoft.EntityFrameworkCore;
 
 namespace ClaudeDo.Ui.ViewModels.Modals;
 
 public sealed partial class ListSettingsModalViewModel : ViewModelBase
 {
     private readonly WorkerClient _worker;
+    private readonly IDbContextFactory<ClaudeDoDbContext> _dbFactory;
 
     public string ListId { get; set; } = "";
 
+    // True after the list was deleted, so the caller reloads the list nav instead of refreshing the row.
+    public bool Deleted { get; private set; }
+
+    // Wired by the view to prompt yes/no before deleting and to surface a blocking-FK error.
+    public Func<string, Task<bool>>? ConfirmAsync { get; set; }
+    public Func<string, Task>? ShowErrorAsync { get; set; }
+
     [ObservableProperty] private string _name = "";
     [ObservableProperty] private string _workingDir = "";
     [ObservableProperty] private string _defaultCommitType = CommitTypeRegistry.DefaultType;
@@ -29,9 +40,10 @@ public sealed partial class ListSettingsModalViewModel : ViewModelBase
 
     public Action? CloseAction { get; set; }
 
-    public ListSettingsModalViewModel(WorkerClient worker)
+    public ListSettingsModalViewModel(WorkerClient worker, IDbContextFactory<ClaudeDoDbContext> dbFactory)
     {
         _worker = worker;
+        _dbFactory = dbFactory;
     }
 
     public async Task LoadAsync(
@@ -78,6 +90,35 @@ public sealed partial class ListSettingsModalViewModel : ViewModelBase
         CloseAction?.Invoke();
     }
 
+    [RelayCommand]
+    private async Task DeleteAsync()
+    {
+        var displayName = string.IsNullOrWhiteSpace(Name) ? "Untitled" : Name;
+        if (ConfirmAsync is not null)
+        {
+            var ok = await ConfirmAsync($"Delete list \"{displayName}\" and all its tasks? This cannot be undone.");
+            if (!ok) return;
+        }
+
+        try
+        {
+            await using var ctx = await _dbFactory.CreateDbContextAsync();
+            var lists = new ListRepository(ctx);
+            await lists.DeleteAsync(ListId);
+        }
+        catch (Exception ex) when (
+               ex.Message.Contains("FOREIGN KEY", StringComparison.OrdinalIgnoreCase)
+            || ex.InnerException?.Message.Contains("FOREIGN KEY", StringComparison.OrdinalIgnoreCase) == true)
+        {
+            if (ShowErrorAsync is not null)
+                await ShowErrorAsync("This list has planning sessions with child tasks. Discard those first, then delete the list.");
+            return;
+        }
+
+        Deleted = true;
+        CloseAction?.Invoke();
+    }
+
     [RelayCommand]
     private void Cancel() => CloseAction?.Invoke();
 

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

@@ -26,6 +26,8 @@ public partial class ListsIslandView : UserControl
                 {
                     var window = new ListSettingsModalView { DataContext = modal };
                     modal.CloseAction = () => window.Close();
+                    modal.ConfirmAsync = ShowConfirmAsync;
+                    modal.ShowErrorAsync = ShowErrorDialogAsync;
                     var top = TopLevel.GetTopLevel(this) as Window;
                     if (top is null) window.Show();
                     else await window.ShowDialog(top);
@@ -93,6 +95,43 @@ public partial class ListsIslandView : UserControl
     private static System.Threading.Tasks.Task JumpToTaskAsync(IslandsShellViewModel s, string listId, string taskId)
         => JumpToTaskHelper.SelectAsync(s, listId, taskId);
 
+    private async System.Threading.Tasks.Task ShowErrorDialogAsync(string message)
+    {
+        var owner = TopLevel.GetTopLevel(this) as Window;
+        if (owner is null) return;
+
+        var ok = new Button { Content = "OK", MinWidth = 90 };
+        var dialog = new Window
+        {
+            Title = "Error",
+            Width = 360,
+            SizeToContent = SizeToContent.Height,
+            CanResize = false,
+            WindowStartupLocation = WindowStartupLocation.CenterOwner,
+            ShowInTaskbar = false,
+            Background = this.FindResource("SurfaceBrush") as IBrush,
+            Content = new StackPanel
+            {
+                Spacing = 16,
+                Margin = new Thickness(20),
+                Children =
+                {
+                    new TextBlock { Text = message, TextWrapping = TextWrapping.Wrap },
+                    new StackPanel
+                    {
+                        Orientation = Orientation.Horizontal,
+                        Spacing = 8,
+                        HorizontalAlignment = HorizontalAlignment.Right,
+                        Children = { ok },
+                    },
+                },
+            },
+        };
+
+        ok.Click += (_, _) => dialog.Close();
+        await dialog.ShowDialog(owner);
+    }
+
     private async System.Threading.Tasks.Task<bool> ShowConfirmAsync(string message)
     {
         var owner = TopLevel.GetTopLevel(this) as Window;

src/ClaudeDo.Ui/Views/Modals/ListSettingsModalView.axaml

@@ -42,6 +42,10 @@
       <Setter Property="Foreground" Value="{DynamicResource DeepBrush}"/>
       <Setter Property="FontWeight" Value="SemiBold"/>
     </Style>
+    <Style Selector="Button.danger">
+      <Setter Property="Background" Value="{DynamicResource BloodBrush}"/>
+      <Setter Property="Foreground" Value="White"/>
+    </Style>
   </Window.Styles>
 
   <Border Background="{DynamicResource SurfaceBrush}"
@@ -168,12 +172,14 @@
               Background="{DynamicResource DeepBrush}"
               BorderBrush="{DynamicResource LineBrush}"
               BorderThickness="0,1,0,0">
-        <StackPanel Orientation="Horizontal" Spacing="8"
+        <Grid ColumnDefinitions="Auto,*,Auto" VerticalAlignment="Center" Margin="16,0">
-                    HorizontalAlignment="Right" VerticalAlignment="Center"
+          <Button Grid.Column="0" Content="Delete list" Classes="danger"
-                    Margin="16,0">
+                  Command="{Binding DeleteCommand}" MinWidth="90"/>
+          <StackPanel Grid.Column="2" Orientation="Horizontal" Spacing="8">
             <Button Content="Cancel" Command="{Binding CancelCommand}" MinWidth="90"/>
             <Button Content="Save" Classes="primary" Command="{Binding SaveCommand}" MinWidth="90"/>
           </StackPanel>
+        </Grid>
       </Border>
 
     </Grid>