Compact cards previously had two truncation systems taped together: a
text-only clamp inside MemoContent (144px, no re-measure on image load,
fade tinted to the wrong surface) and a whole-tile cap in ColumnGrid
(hard clip mid-image, no affordance), later joined by a content-shape
rule choosing an owner per card — which could still stack two Show-more
buttons and silently broke footnote navigation in clamped cards.
Now there is exactly one mechanism: ClampedSection measures its content
and folds anything taller than 420px to a 360px preview with a fade and
a Show more/less toggle. MemoBody wraps the whole body in it (reactions
stay outside, never hidden); ColumnGrid is pure packing again and never
clips; MemoContent is a stateless renderer whose `compact` prop only
informs footnote-link behavior; MemoPreview uses a static CSS bound in
place of its previously inert toggle.
Deltas: text-only compact previews grow from ~6 rows to the same 360px
image cards get, and pinned memos clamp like any card (pinned means
ordering and a badge, not size).
