The dashboard tabbar was the styling outlier: a folder-tab metaphor
(top-rounded corners, transparent side borders overlapping the strip
border, and a box-shadow lift on the active tab) while every standalone
page's sub-tabs use the flat shared .hive-tab pill. Restyle .tabbar .tab
to the same pill family — drop the lift shadow, folder border and
top-only radius; active tab now uses the filled var(--border) background
like .hive-tab--active.
Kept a touch more weight than the bare sub-tab (larger 0.92em font, bold
labels, count pills) since this is the dashboard's primary nav, per the
operator's 'less fancy but not too minimal' steer. CSS-only, no markup
or behaviour change.
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