layerling 1.56.2

• Fillet and chamfer: Apply no longer hangs after the size field: Clicking into the size field and leaving it without a change - a click on its label is enough - threw the preview away as if the size had changed, but never computed a new one, so Apply kept spinning until the sharp-edge threshold was moved. Leaving a field unchanged now changes nothing. Reported by @trabtrading-design in #204.