feat(ui): drag a task into Mission Control to queue it

src/ClaudeDo.Ui/ViewModels/MissionControlViewModel.cs

@@ -95,6 +95,26 @@ public sealed partial class MissionControlViewModel : ViewModelBase, IDisposable
         catch { /* best-effort queue refresh */ }
     }
 
+    // Drop-to-queue: a task dragged from the main app onto Mission Control gets queued.
+    public async System.Threading.Tasks.Task EnqueueTaskAsync(string taskId)
+    {
+        if (string.IsNullOrEmpty(taskId)) return;
+        try
+        {
+            await using var db = await _dbFactory.CreateDbContextAsync();
+            var entity = await db.Tasks.FirstOrDefaultAsync(t => t.Id == taskId);
+            if (entity is null
+                || entity.Status == ClaudeDo.Data.Models.TaskStatus.Running
+                || entity.Status == ClaudeDo.Data.Models.TaskStatus.Queued)
+                return;
+            entity.Status = ClaudeDo.Data.Models.TaskStatus.Queued;
+            await db.SaveChangesAsync();
+            await _worker.WakeQueueAsync();
+        }
+        catch { /* best-effort enqueue */ }
+        await RefreshQueueAsync();
+    }
+
     private void SeedActive()
     {
         foreach (var a in _worker.GetActiveTasks())

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

@@ -15,7 +15,8 @@ namespace ClaudeDo.Ui.Views.Islands;
 
 public partial class TasksIslandView : UserControl
 {
-    private static readonly DataFormat<string> TaskRowFormat =
+    // Public so the Mission Control window can accept the same drag payload (drop-to-queue).
+    public static readonly DataFormat<string> TaskRowFormat =
         DataFormat.CreateStringApplicationFormat("claudedo-task-row");
 
     public TasksIslandView()

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

@@ -6,7 +6,8 @@
              xmlns:loc="using:ClaudeDo.Ui.Localization"
              x:DataType="vm:MissionControlViewModel"
              x:Class="ClaudeDo.Ui.Views.MissionControl.MissionControlView">
-  <DockPanel LastChildFill="True" Background="{DynamicResource VoidBrush}">
+  <DockPanel LastChildFill="True" Background="{DynamicResource VoidBrush}"
+             DragDrop.AllowDrop="True">
 
     <!-- Header -->
     <Border DockPanel.Dock="Top"

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

@@ -5,6 +5,7 @@ using Avalonia.Interactivity;
 using Avalonia.VisualTree;
 using ClaudeDo.Ui.ViewModels;
 using ClaudeDo.Ui.ViewModels.Islands;
+using ClaudeDo.Ui.Views.Islands;
 
 namespace ClaudeDo.Ui.Views.MissionControl;
 
@@ -23,15 +24,28 @@ public partial class MissionControlView : UserControl
 
     private void OnPaneDragOver(object? sender, DragEventArgs e)
     {
-        e.DragEffects = (e.DataTransfer?.Contains(PaneFormat) ?? false)
-            ? DragDropEffects.Move
-            : DragDropEffects.None;
+        var dt = e.DataTransfer;
+        var accept = (dt?.Contains(PaneFormat) ?? false)
+                     || (dt?.Contains(TasksIslandView.TaskRowFormat) ?? false);
+        e.DragEffects = accept ? DragDropEffects.Move : DragDropEffects.None;
     }
 
     private void OnPaneDrop(object? sender, DragEventArgs e)
     {
         if (DataContext is not MissionControlViewModel vm) return;
-        var draggedId = e.DataTransfer?.TryGetValue(PaneFormat);
+        var dt = e.DataTransfer;
+        if (dt is null) return;
+
+        // A task dragged from the main app → queue it.
+        var taskId = dt.TryGetValue(TasksIslandView.TaskRowFormat);
+        if (!string.IsNullOrEmpty(taskId))
+        {
+            _ = vm.EnqueueTaskAsync(taskId);
+            return;
+        }
+
+        // A pane dragged within the grid → reorder.
+        var draggedId = dt.TryGetValue(PaneFormat);
         if (string.IsNullOrEmpty(draggedId)) return;
         if (e.Source is not Avalonia.Visual src) return;