feat(mission-control): Handler-Run per Knopf abbrechen

Ein "Abandon run"-Knopf an Handler-Panes fragt HandlerRoundState.Get(handlerTaskId)
nach den noch offenen (Queued/Running) Tasks des Laufs, bestaetigt mit Anzahl,
cancelt jeden ueber den bestehenden CancelTaskAsync-Pfad und schliesst danach die
Session -- ein Schritt statt Tile schliessen + Queue separat abbrechen. Ohne
offene Tasks (oder ohne Round-Eintrag) schliesst die Aktion direkt, ohne Dialog.
Nur an den beiden Handler-Panes sichtbar (IsListHandler), normale Task-/Ad-hoc-
Panes bleiben unveraendert.

src/ClaudeDo.Ui/Services/Interfaces/IWorkerClient.cs

@@ -158,6 +158,10 @@ public interface IWorkerClient : INotifyPropertyChanged
     /// running. The exit code only exists in this process; the worker decides whether it was a
     /// list-handler session killed by the usage limit and reopens the same phase after the 5h reset.</summary>
     Task ReportInteractiveSessionExitedAsync(string taskId, int exitCode, CancellationToken ct = default);
+    /// <summary>The handler round's still-open (Queued/Running) tasks, for the Mission Control
+    /// "abandon run" action. Empty when the round has no entry or nothing open -- the caller then
+    /// closes the pane without a confirmation dialog.</summary>
+    Task<IReadOnlyList<HandlerOpenTaskDto>> GetHandlerOpenTasksAsync(string handlerTaskId, CancellationToken ct = default);
     /// <summary>Starts a planning session and returns the launch spec for an embedded ConPTY
     /// planning terminal (replaces StartPlanningSessionAsync's external wt window).</summary>
     Task<LaunchSpec> GetPlanningStartLaunchSpecAsync(string taskId, CancellationToken ct = default);

src/ClaudeDo.Ui/Services/WorkerClient.cs

@@ -641,6 +641,9 @@ public partial class WorkerClient : ObservableObject, IAsyncDisposable, IWorkerC
     public Task ReportInteractiveSessionExitedAsync(string taskId, int exitCode, CancellationToken ct = default)
         => InvokeTimedAsync("ReportInteractiveSessionExited", () => _hub.InvokeAsync("ReportInteractiveSessionExited", taskId, exitCode, ct));
 
+    public async Task<IReadOnlyList<HandlerOpenTaskDto>> GetHandlerOpenTasksAsync(string handlerTaskId, CancellationToken ct = default)
+        => await InvokeTimedAsync<List<HandlerOpenTaskDto>>("GetHandlerOpenTasks", () => _hub.InvokeAsync<List<HandlerOpenTaskDto>>("GetHandlerOpenTasks", handlerTaskId, ct));
+
     public async Task<LaunchSpec> GetPlanningStartLaunchSpecAsync(string taskId, CancellationToken ct = default)
         => await InvokeTimedAsync<LaunchSpec>("GetPlanningStartLaunchSpec", () => _hub.InvokeAsync<LaunchSpec>("GetPlanningStartLaunchSpec", taskId, ct));
 

src/ClaudeDo.Ui/ViewModels/MissionControl/ConPtyPaneViewModel.cs

@@ -18,6 +18,12 @@ public sealed partial class ConPtyPaneViewModel : ViewModelBase, IDisposable
     // Only a task-based pane can be submitted for review (an ad-hoc directory session has no task).
     public bool IsTaskBased => TaskId is not null;
 
+    /// <summary>Set by the host for a list-handler run ("Let Claude handle it" / "Let Claude merge
+    /// the reviews") pane -- shows the "Abandon run" action. Plain mutable property, not
+    /// <see cref="ObservableProperty"/>: the host sets it once right after construction, before the
+    /// pane is added to the visible collection, so no change notification is needed.</summary>
+    public bool IsListHandler { get; set; }
+
     [ObservableProperty] private string _displayTitle;
 
     [ObservableProperty] private InteractiveTerminalViewModel _terminal = new();
@@ -26,6 +32,10 @@ public sealed partial class ConPtyPaneViewModel : ViewModelBase, IDisposable
     /// flight, so a rapid double-click can't race two submissions for the same task.</summary>
     [ObservableProperty] private bool _isSubmitPending;
 
+    /// <summary>Set by the host while an abandon-run round trip (query open tasks, confirm,
+    /// cancel each, close pane) is in flight, so a rapid double-click can't race two runs.</summary>
+    [ObservableProperty] private bool _isAbandonPending;
+
     /// <summary>Raised when the terminal failed to start — the host surfaces this via the footer error strip.</summary>
     public event Action<string>? ErrorReported;
 
@@ -36,6 +46,12 @@ public sealed partial class ConPtyPaneViewModel : ViewModelBase, IDisposable
     /// commits the worktree and moves the task to WaitingForReview.</summary>
     public event Action<string>? SubmitForReviewRequested;
 
+    /// <summary>Raised when the user abandons a list-handler run (<see cref="IsListHandler"/>
+    /// only): the host looks up this round's still-open tasks, confirms with the user (naming the
+    /// count), cancels them, then closes this pane -- one action instead of closing the tile and
+    /// separately cancelling the queue.</summary>
+    public event Action<string>? AbandonRunRequested;
+
     /// <summary>Raised with <c>(taskId, exitCode)</c> when a task-based session that had been running
     /// dies non-zero. The host reports it to the worker, which decides whether this was a list
     /// handler killed by the usage limit and worth reopening. Ad-hoc panes never raise it — there is
@@ -141,6 +157,16 @@ public sealed partial class ConPtyPaneViewModel : ViewModelBase, IDisposable
 
     partial void OnIsSubmitPendingChanged(bool value) => SubmitForReviewCommand.NotifyCanExecuteChanged();
 
+    private bool CanAbandonRun() => IsListHandler && !IsAbandonPending;
+
+    [RelayCommand(CanExecute = nameof(CanAbandonRun))]
+    private void AbandonRun()
+    {
+        if (TaskId is { } id) AbandonRunRequested?.Invoke(id);
+    }
+
+    partial void OnIsAbandonPendingChanged(bool value) => AbandonRunCommand.NotifyCanExecuteChanged();
+
     // A launch failure permanently occupies the TaskId dedupe slot unless the user can retry —
     // re-opening the same task would otherwise just re-focus a dead tile.
     private bool CanRetry() => Terminal.HasExited && Terminal.StartError is not null;

src/ClaudeDo.Ui/ViewModels/MissionControlViewModel.cs

@@ -79,6 +79,10 @@ public sealed partial class MissionControlViewModel : ViewModelBase, IDisposable
     // MissionControlView.OnNewSessionClicked).
     public Action? BrowseForSessionRequested { get; set; }
 
+    // View-layer seam: confirms the "abandon run" action, naming the open-task count. Wired by the
+    // view the same way TasksIslandViewModel/DetailsIslandViewModel are.
+    public Func<string, System.Threading.Tasks.Task<bool>>? ConfirmAsync { get; set; }
+
     public UsagePillViewModel UsagePill { get; }
 
     public MissionControlViewModel(IDbContextFactory<ClaudeDoDbContext> dbFactory, IWorkerClient worker, UsagePillViewModel usagePill)
@@ -375,7 +379,7 @@ public sealed partial class MissionControlViewModel : ViewModelBase, IDisposable
             }
 
             AddConPtyPane(new ConPtyPaneViewModel(taskId, title,
-                () => DescribeAsync(() => launchSpec(taskId))));
+                () => DescribeAsync(() => launchSpec(taskId))) { IsListHandler = true });
         }
         finally
         {
@@ -416,7 +420,8 @@ public sealed partial class MissionControlViewModel : ViewModelBase, IDisposable
         catch { /* best-effort title lookup */ }
 
         AddConPtyPane(new ConPtyPaneViewModel(taskId, title,
-            () => DescribeAsync(() => _worker.GetMergeHelperHandoffLaunchSpecAsync(taskId, survivingTaskIds, nextPhase))));
+            () => DescribeAsync(() => _worker.GetMergeHelperHandoffLaunchSpecAsync(taskId, survivingTaskIds, nextPhase)))
+            { IsListHandler = true });
     }
 
     // The 5h usage window is about to run out under this handler session: type the worker's warning
@@ -440,6 +445,7 @@ public sealed partial class MissionControlViewModel : ViewModelBase, IDisposable
         pane.CloseRequested += CloseConPtySession;
         pane.SubmitForReviewRequested += OnPaneSubmitForReview;
         pane.SessionDiedAfterStartup += OnPaneSessionDied;
+        pane.AbandonRunRequested += OnPaneAbandonRun;
         ConPtySessions.Add(pane);
         pane.Start();
     }
@@ -495,6 +501,41 @@ public sealed partial class MissionControlViewModel : ViewModelBase, IDisposable
         }
     }
 
+    // Handler-run abort ("Not-Aus"): cancels every still-open (Queued/Running) task this handler
+    // round queued or started, then closes the pane -- one action instead of "close tile" + "cancel
+    // the tasks separately", which used to leave orphaned rows nobody merges. No open tasks (or no
+    // round entry at all -- 7-day retention, or a run predating this feature) closes the pane
+    // straight away, no confirmation needed. Guarded by IsAbandonPending like OnPaneSubmitForReview.
+    private async void OnPaneAbandonRun(string taskId)
+    {
+        if (ConPtySessions.FirstOrDefault(s => s.TaskId == taskId) is not { } pane || pane.IsAbandonPending)
+            return;
+
+        pane.IsAbandonPending = true;
+        try
+        {
+            var open = await _worker.GetHandlerOpenTasksAsync(taskId);
+            if (open.Count > 0)
+            {
+                if (ConfirmAsync is null) return;
+                if (!await ConfirmAsync(Loc.T("missionControl.abandonRunConfirm", open.Count))) return;
+
+                foreach (var task in open)
+                    await _worker.CancelTaskAsync(task.Id);
+            }
+
+            CloseConPtySession(pane);
+        }
+        catch (Exception ex)
+        {
+            ErrorReported?.Invoke(Loc.T("missionControl.abandonRunFailed", ex.Message));
+        }
+        finally
+        {
+            pane.IsAbandonPending = false;
+        }
+    }
+
     private void CloseConPtySession(ConPtyPaneViewModel pane)
     {
         if (!ConPtySessions.Contains(pane)) return;
@@ -502,6 +543,7 @@ public sealed partial class MissionControlViewModel : ViewModelBase, IDisposable
         pane.CloseRequested -= CloseConPtySession;
         pane.SubmitForReviewRequested -= OnPaneSubmitForReview;
         pane.SessionDiedAfterStartup -= OnPaneSessionDied;
+        pane.AbandonRunRequested -= OnPaneAbandonRun;
         ConPtySessions.Remove(pane);
         pane.Dispose();
     }
@@ -555,6 +597,7 @@ public sealed partial class MissionControlViewModel : ViewModelBase, IDisposable
             c.CloseRequested -= CloseConPtySession;
             c.SubmitForReviewRequested -= OnPaneSubmitForReview;
             c.SessionDiedAfterStartup -= OnPaneSessionDied;
+            c.AbandonRunRequested -= OnPaneAbandonRun;
             c.Dispose();
         }
         ConPtySessions.Clear();

src/ClaudeDo.Ui/Views/MissionControl/ConPtyPaneView.axaml

@@ -14,7 +14,7 @@
               Background="{DynamicResource Surface2Brush}"
               BorderBrush="{DynamicResource LineBrush}"
               BorderThickness="0,0,0,1" Padding="8,3">
-        <Grid ColumnDefinitions="*,Auto,Auto">
+        <Grid ColumnDefinitions="*,Auto,Auto,Auto">
           <TextBlock Grid.Column="0" Classes="meta" Text="{Binding DisplayTitle}"
                      TextTrimming="CharacterEllipsis"
                      ToolTip.Tip="{Binding DisplayTitle}"
@@ -25,7 +25,12 @@
                   Content="{loc:Tr missionControl.submitForReview}"
                   ToolTip.Tip="{loc:Tr missionControl.submitForReviewTip}"
                   Command="{Binding SubmitForReviewCommand}" />
-          <Button Grid.Column="2" Classes="title-ctrl"
+          <Button Grid.Column="2" Classes="btn" Margin="0,0,6,0"
+                  IsVisible="{Binding IsListHandler}"
+                  Content="{loc:Tr missionControl.abandonRun}"
+                  ToolTip.Tip="{loc:Tr missionControl.abandonRunTip}"
+                  Command="{Binding AbandonRunCommand}" />
+          <Button Grid.Column="3" Classes="title-ctrl"
                   Command="{Binding CloseCommand}"
                   ToolTip.Tip="{loc:Tr missionControl.closeSession}">
             <PathIcon Data="{StaticResource Icon.WinClose}" Width="12" Height="12"/>

src/ClaudeDo.Ui/Views/MissionControl/MissionControlView.axaml.cs

@@ -2,6 +2,7 @@ using System;
 using System.Collections.Specialized;
 using System.ComponentModel;
 using System.Linq;
+using Avalonia;
 using Avalonia.Controls;
 using Avalonia.Layout;
 using Avalonia.Media;
@@ -55,6 +56,7 @@ public partial class MissionControlView : UserControl
             _vm.Panes.CollectionChanged -= OnPanesChanged;
             _vm.PropertyChanged -= OnViewModelPropertyChanged;
             _vm.BrowseForSessionRequested = null;
+            _vm.ConfirmAsync = null;
         }
 
         _vm = DataContext as MissionControlViewModel;
@@ -64,12 +66,59 @@ public partial class MissionControlView : UserControl
             _vm.Panes.CollectionChanged += OnPanesChanged;
             _vm.PropertyChanged += OnViewModelPropertyChanged;
             _vm.BrowseForSessionRequested = BrowseForSessionAsync;
+            _vm.ConfirmAsync = ShowConfirmAsync;
         }
 
         RebuildOverviewGrid();
         UpdateQueueColumn();
     }
 
+    // Abandon-run confirmation -- same TaskCompletionSource-backed plain Window as
+    // TasksIslandView.ShowConfirmAsync (no shared control for this shape yet).
+    private async Task<bool> ShowConfirmAsync(string message)
+    {
+        var owner = TopLevel.GetTopLevel(this) as Window;
+        if (owner is null) return false;
+
+        var tcs = new TaskCompletionSource<bool>();
+        var cancel = new Button { Content = "Cancel", MinWidth = 90 };
+        var confirm = new Button { Content = "Confirm", MinWidth = 90, Classes = { "danger" } };
+
+        var dialog = new Window
+        {
+            Title = "Confirm",
+            Width = 380,
+            SizeToContent = SizeToContent.Height,
+            CanResize = false,
+            WindowStartupLocation = WindowStartupLocation.CenterOwner,
+            ShowInTaskbar = false,
+            Background = this.FindResource("SurfaceBrush") as IBrush,
+            Content = new StackPanel
+            {
+                Margin = new Thickness(20),
+                Spacing = 16,
+                Children =
+                {
+                    new TextBlock { Text = message, TextWrapping = TextWrapping.Wrap },
+                    new StackPanel
+                    {
+                        Orientation = Orientation.Horizontal,
+                        HorizontalAlignment = HorizontalAlignment.Right,
+                        Spacing = 8,
+                        Children = { cancel, confirm },
+                    },
+                },
+            },
+        };
+
+        cancel.Click += (_, _) => { tcs.TrySetResult(false); dialog.Close(); };
+        confirm.Click += (_, _) => { tcs.TrySetResult(true); dialog.Close(); };
+        dialog.Closed += (_, _) => tcs.TrySetResult(false);
+
+        _ = dialog.ShowDialog(owner);
+        return await tcs.Task;
+    }
+
     private void OnPanesChanged(object? sender, NotifyCollectionChangedEventArgs e) => RebuildOverviewGrid();
 
     private void OnViewModelPropertyChanged(object? sender, PropertyChangedEventArgs e)