fix: restore the whole outline after cutting its only picture
Keep the empty text paragraph when reconstructing an emptied outline for Undo. Cover Cut, Undo, Redo, and Undo on a lone inline picture.
Refs #80
Assisted-by: gpt-6.1-sol
aff2de64c7clover caruso committed on 10/4/2026, 5:37:36 AMparentfa491ad