positionPopup clamped horizontally but never vertically: the
flip-above branch positioned tall popups (rich layouts, lead figures)
above the visible region whenever the target sat near the top of the
screen. Placement is now: below if it fits, above if THAT fits, else
the roomier side — then clamped into the viewport on both axes.
.link-popup is additionally capped at viewport height (matching GAP,
overflow-y: auto) so the clamp always has room to work, and a
dimension-less image that loads after positioning re-clamps instead of
growing past the edge.
Verified by simulating the clamp across five viewport scenarios: the
near-top bug case moves from 470px above the viewport to fully
visible; the fits-below and flip-above cases are unchanged.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Levi Neuwirth
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