feat(ui): remove a queued interactive message with a ✕

Queued rows are now QueuedMessageViewModel (Text + RemoveCommand); each shows a
✕ (Icon.WinClose) that calls RemoveQueuedInteractiveMessageAsync(taskId, text).
The worker re-broadcasts the queue, rebuilding the strip without the removed
message. Adds session.composer.unqueue (en/de).

tests/ClaudeDo.Ui.Tests/ViewModels/TaskMonitorViewModelTests.cs

@@ -333,6 +333,8 @@ public class TaskMonitorViewModelTests : IDisposable
         worker.RaiseInteractiveQueueChanged("t1", new[] { "msg1", "msg2" });
 
         Assert.Equal(2, vm.QueuedMessages.Count);
+        Assert.Equal("msg1", vm.QueuedMessages[0].Text);
+        Assert.Equal("msg2", vm.QueuedMessages[1].Text);
         Assert.True(vm.HasQueuedMessages);
     }
 
@@ -378,6 +380,22 @@ public class TaskMonitorViewModelTests : IDisposable
         Assert.False(vm.HasQueuedMessages);
     }
 
+    [Fact]
+    public async Task QueuedMessageViewModel_RemoveCommand_RecordsRemoveCall()
+    {
+        var worker = new FakeWorker();
+        using var vm = Build(worker);
+        vm.SetTaskId("t1");
+        worker.RaiseInteractiveQueueChanged("t1", new[] { "a", "b" });
+
+        vm.QueuedMessages[0].RemoveCommand.Execute(null);
+        // RemoveQueuedAsync is fire-and-forget; yield to let the async continuation run
+        await System.Threading.Tasks.Task.Yield();
+
+        Assert.Single(worker.RemovedQueued);
+        Assert.Equal(("t1", "a"), worker.RemovedQueued[0]);
+    }
+
     [Fact]
     public async Task InterruptInteractiveCommand_WhenLive_RecordsOneCall()
     {