Phase 9c · Tier A

RN-universal Menubar pilot

Scaffolded

Horizontal row of menus. Each menu coordinates with the row root so opening one closes the others. v1 ships click-to-toggle; arrow-key navigation across triggers is a 0.2.x candidate.

Side-by-side: app menubar

shadcn (Radix)

Semantics

Aspect	shadcn	RN	Notes
Root role	role="menubar"	role="menubar"	Same
Trigger	role="menuitem"	role="menuitem"	Same
Coordination	one open, others close	one open, others close	Via openValue context
Arrow keys	roving focus across	no (v1)	0.2.x candidate
Sub-menus	yes	no (v1)	0.2.x candidate