In short
an opened card is decluttered - add buttons on their title's line, a compact attachment list with its upload rules in the upload popup, and two new Show on Card rows for attachment previews and details - and Board Settings / Card spreads into columns to fit the screen, with rows dragged by handle, icon or label. List moves no longer raise false HistoryIntegrity reports, refused edits no longer disable accounts, and a restarting database is no longer a crash.
Thanks to above GitHub users for their contributions.
