Add Undo Functionality

Currently, users have to manually delete a node if they make a mistake during editing. Introducing an undo function(CTRL +Z) would significantly improve the user experience by allowing users to easily revert recent actions without having to delete and recreate nodes.

Start by tracing the node-editing workflow and how keyboard shortcuts are handled; the issue provides no file or test pointers. Done means recent editing actions can be reverted with Ctrl+Z, removing the need to manually delete and recreate nodes.

Written by the indexing model from the issue text.