Penpal gratefully uses the following third-party code, under MIT license:

Bezierjs by Pomax - for general Bezier magic.

fit-curve by Aleksandr Motsjonov - for the Simplify function to optimise bezier paths.

DragSelect by Thibault Jan Beyer - for selecting elements in the canvas by dragging.

SweetAlert2 by various contributors - for alerts and tooltips.

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