The corpus just ratified the plural case: a multi-selection anchors
at its last member in flatten order (lane order, then card order —
the multi-drag order, the same anchor paste will use), so creation
follows the last selected card or appends to the last selected lane
instead of falling through to the last-active lane. One display-order
walk keeps the resolver pure; the sole selection is now just the
degenerate one-member case.
Claude-Session: https://claude.ai/code/session_01SR4XGjmBE16ZUYWpfFHXwY
rzen
3be38fcb47