StartRectangleRegionOptions
type StartRectangleRegionOptions = Omit<Partial<ui.RectangularSelectionRegion.Options>, "paper">;
Per-call options for startRectangleRegion() on the RegionApi
returned by useRegion. Accepts every ui.RectangularSelectionRegion.Options
field (the base ui.SelectionRegion.Options: layer, normalize, onChange)
except paper, which the hook supplies from its resolved paper.