Latitude bands (v6/7) are flat strips under Y-rot; trace hub SVG
ellipses to sphere with null-gap flush to avoid chord artifacts.
Co-authored-by: Cursor <cursoragent@cursor.com>
globe3d=1 keeps legacy hybrid ortho/mercator; globe3d=2 samples
hub-logo-continents-mercator-flat on visible z>0 and draws full
parallel/meridian rings so axes and continents survive rotation.
Co-authored-by: Cursor <cursoragent@cursor.com>