The memory import-review list (.memory-suggestions) is shown inside the
overflow:hidden .admin-card but, unlike the sibling .memory-list, it had
no scroll bounding of its own (no flex:1 / min-height:0 / overflow-y).
A long review list therefore grew past the card and was clipped, leaving
lower entries and their controls unreachable with no usable scroll area.
Give .memory-suggestions the same flex:1 + min-height:0 + overflow-y:auto
bounding the memories list already uses so the review list scrolls
internally within the modal. Pin the review header (the title and the
save all / back controls) with position:sticky so they stay visible while
the items scroll under them, and add a small scrollbar gutter so the bar
does not sit flush against the item cards.
Fixes#455
6ad617931d