The shared Tabs primitive used data-horizontal:* / data-vertical:* Tailwind
variants, but the component sets data-orientation='horizontal' (not
data-horizontal). Tailwind v4 data-* variants match attribute names, so
data-horizontal:flex-col on the Tabs root never applied -- the TabsList
and TabsContent laid out side-by-side instead of stacking.
Other consumers (TabbedCard, Settings) wrap their tab children in <div>s,
so the broken flex direction was masked. ServicePage puts TabsList and
TabsContent as direct children of <Tabs>, exposing the bug.
Fix: switch every dead variant to data-[orientation=horizontal]:* /
data-[orientation=vertical]:* (the root flex-col, the list h-8/h-fit/
flex-col, the trigger w-full/justify-start, and the active-indicator
after-element positioning). The full orientation system now works as
intended for both horizontal and vertical tabs.
117 tests pass; lint/build green.
Developer