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Description
We indeed need a unified undo/redo to handle both canvas (Reactflow) and text (Monaco and Remirror) operations, as suggested by @forrestbao.
This needs to be done with Yjs UndoManager to support collaboration.
Note that undo/redo is a separate feature from a history/VCS system. Undo/redo is supposed to work in a short period of time within the browser session.