The modal's group is usually 2-4 rows touching only 1-2 comptes -- unlike
the main table (always all 8, so columns line up across every row/year),
showing all 8 there was mostly empty columns. New modalComptes computed
filters allComptes down to whichever actually carry a value somewhere in
filterEntreeGroup.
Also renamed "Entrée + sorties liées" to "Entrées et sorties liées"
(title and footer label) to match multi-entrée groups.