Stabilize empty-drop tag removal confirmation

Ariver

2026-05-28 da71eb5bccbdbd22da7cd74b6ddcec031f069482

 Apptag/AppGridCollectionView.swift

@@ -339,7 +339,9 @@
        guard let coordinator,
              coordinator.displayStyle != .flat
        else { return }
        coordinator.onDropOutsideGroup(path, source, copy)
        DispatchQueue.main.async {
            coordinator.onDropOutsideGroup(path, source, copy)
        }
    }

    private func setup() {