The hovered cell (the card anchors to its range, a merge included).
Copy the address to the clipboard.
Select the cell and open the hyperlink editor.
Follow the link.
The linked page's preview once the lookup resolved, or null — see
HyperlinkLayerProps.preview. Draw its picture with LinkPreviewImage, which shows it
only once it exists.
Remove the link; the cell's text stays.
Spread onto the card root (keeps the card open while hovered; registers it with the tooltip group).
What a hyperlink card is handed. The actions are bound to the hovered cell.