Pinned was capped at half the viewport by its own nested scroller, so past
roughly a dozen pins the rest were reachable only by scrolling inside a
scroller — a pin you have to go hunting for isn't doing its job.
Drop the cap and let the section grow into the sidebar's existing scroll,
and stop virtualizing Pinned: virtualization needs a bounded viewport to
measure against, which is exactly what's being removed. No count badge, no
"show more" — pin as many as you want and they all render.
Also back-fill pins on the API-server list route, which was the one list
path still windowing purely on recency.
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