fix(ui): drop notification for the removed CanPickUpInTerminal property

Semantic merge collision between two tasks merged in the same run: the
"remove pick up in terminal" refactor deleted DetailsIslandViewModel's
CanPickUpInTerminal, while the status-refresh fix (written against the
pre-deletion base) still raised a change notification for it. Git merged
both cleanly; the build did not.

CanAcceptDrop is still notified - that binding remains.

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

@@ -786,7 +786,6 @@ public sealed partial class DetailsIslandViewModel : ViewModelBase, IDisposable
                 .FirstOrDefaultAsync(t => t.Id == taskId);
             if (entity is null || Task?.Id != taskId) return;
             Task.UpdateFromEntity(entity);
-            OnPropertyChanged(nameof(CanPickUpInTerminal));
             OnPropertyChanged(nameof(CanAcceptDrop));
         }
         catch { /* best-effort */ }