The growing row of bulk-action buttons above the member overview is replaced
by one "Aktionen" dropdown holding all four actions (open in email program,
copy addresses, export CSV, export PDF). With no selection the actions operate
on all — or the currently filtered — members; the email-program action is
disabled past a recipient cap, because the browser cannot reliably hand a very
long mailto over to the mail client. The trigger shows the active scope as a
badge: an emphasized count when members are selected, a muted "alle"/"gefiltert"
otherwise.
