de998d5932
The previous approach cloned the card DOM node and used removeChild to move it, which meant the source node was gone on re-runs and a stale clone could persist across history restores. Replace with: clear continueGrid, build a fresh <a> element from the source card's attributes/innerHTML on every run, and hide (not remove) the original in #books-grid so it is always available as a clean source. Also scope the data-slug selector to #books-grid to avoid accidental matches against the continue-reading cards themselves.