The bottom row's preview was cut off behind the pagination controls.
.table-container sets overflow-x: auto, and ANY non-visible overflow makes an
element a clipping context, so the absolutely-positioned preview was cropped at
the container's edge. The last row had nowhere to open into.
The preview is now positioned fixed from the chip's bounding rect, which
escapes the clip entirely, and flips ABOVE the chip when there is not room
below. It also clamps horizontally, since the column sits well to the right on
a wide table and the panel is nearly 300px.
Height is measured from the rendered element rather than assumed: it depends on
the blueprint's aspect ratio, which differs per site. That means one tick where
the element exists but is unplaced, so it starts hidden and is revealed once
positioned - otherwise it flashed in the corner of the screen.
Also sets white-space: normal. The table sets nowrap for its cells, which the
preview inherited and which ran the location line off the panel.
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