Integrate current main (CSV import, GDPR join-form description, dependency and
tooling bumps) into the bulk-actions-dropdown feature. Gettext catalogs were
reconciled with mix gettext.extract --merge; the CHANGELOG Unreleased entries
of both sides were combined.
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.
Dropdown openers were visually indistinguishable from ordinary buttons. A
trailing chevron now marks every dropdown trigger — both the shared
dropdown_menu component and the bespoke member-filter trigger — and an
optional badge slot lets a trigger show a status indicator beside its label.
