Upstream already shows the selected ring + clickable check badge on each
thumbnail. This adds the missing piece for dense grids: a slight opacity
reduction on non-selected items while a selection is in progress, so the
selected set stays visible at a glance.
Implemented by passing selectionMode={selectable && selectedIds.length > 0}
from AssetGrid to LazyGridImage; LazyGridImage applies opacity-60 to its
container when selectionMode && !photo.isSelected.
David Gil Pérez
9df6d78501