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fix(lib-classifier): canvas context for SVG drawing tools (#6491)

* fix(lib-classifier): canvas context for SVG drawing tools

Make sure that `SVGContext.canvas` is a reference to the SVG `rect` element that's used as a drawing canvas, so that creating new drawing marks and editing existing marks both use the same screen CTM when calculating the pointer position.

This fixes a bug in Firefox where the `draggable` decorator doesn't correctly track the active pointer, in the context of a zoomed SVG image.

* DRY up SVG event-handling functions

* revert changes to SingleImageViewer

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