three-globe globe (hex polygons + arcs), navbar chevron cleanup
- Globe: real three-globe World via r3f <primitive> (no JSX augmentation),
hex-polygon countries + animated steel-trade arcs, bundled Natural Earth data
- Header: type nav Section.Icon as LucideIcon (fixes r3f JSX type clash);
remove chevron from non-dropdown items (only radar/media dropdowns keep it)
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
@
alireza