The Curvature tool only edited the path it was drawing. It now edits any
selected path, whatever drew it, keeping its shape except where edited:
a click on a point makes it the current (direct-selected) point and a
drag moves it, re-curving only its two segments (the neighbours keep
their handle directions); Alt-click or double-click toggles it smooth or
corner and Delete removes it; a click on a segment adds a smooth point
without changing the shape, and a drag moves it in the same undo step.
With an end of an open path current, clicks go on from it (the old
segments keep their shape) and a click on the other end closes it.
The edits go through a new path.curvatureEdit command (move, insert,
extend, close), path.convertAnchor and path.removeAnchor, one undo step
each. The tool now claims Delete/Backspace while it has a point to
remove, so the key no longer deletes the whole path.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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