{{--
Aurora shell — horizontal top nav with the wallet balance always visible in
the header. Skinned entirely by the base :root/.dark tokens (Aurora is the
default identity). Consumes $nav / $navActive / $user / $balance / $slot from
the client layout wrapper.
--}}
{{-- ============================ TOP NAV ============================ --}}
{{-- `overflow-x:clip` (NOT `overflow:hidden`) contains the nav row sideways while
letting the dropdowns below — language, user menu, the nav submenus — hang
out of the bar. `hidden` clipped them on BOTH axes, so an opened menu showed
only the 3px of its rounded top edge that fitted inside the 56px header.
`clip` on one axis is the one value that keeps `visible` legal on the other. --}}