The popup stacked a CSS border on top of shadow-5, whose first layer is
already a 0 0 0 1px sand-a3 hairline ring, so the edge rendered as two
1px lines. Drop the redundant border and let the shadow provide the
single hairline.
Also transition the scale property instead of transform: Tailwind v4
maps scale-95 to the CSS scale property, so the old transform,opacity
list never animated the scale and the close snapped. Animate scale and
opacity with an explicit 150ms ease-out so open and close are smooth.
Signed-off-by: Émile Ré <emile@probo.com>
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