[Feature Request] Clearing the canvas cannot be undone

[kmcginnes]

Description

When a user clears the canvas it is cleared immediately and there is no way to undo or go back.

This is unfortunate when done on accident.

Preferred Solution

The simplest approach would be to add a confirmation modal to the process to ensure the user is aware that the action cannot be undone.

If we had a way to snapshot the graph in the canvas and restore that snapshot, we could offer an undo action (potentially viable after #298)

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Important

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