fix(web): Powerline separators repaint within their snapped row

#5607's separators came in with main and still used the unsnapped cell height, so
a separator could leave a pixel below its row; its test mock also lacked getTransform.
90cee20220Nick T. committed on 10/19/2026, 8:43:51 PMparentb13b926
3 files changedLine totals unavailable