The Contact and briefing cards' headers repeated the same frame: the title
grid over a hairline, the accent kicker and the square action buttons. It
lives in cockpit-card-header, cockpit-card-kicker and cockpit-card-actions
now, beside each card's own classes, which keep only their spacing and
sizes; the cyber theme targets the shared classes. The computed styles of
every header element are unchanged in the default and cyber themes,
expanded and collapsed.