OnlineBoard, Schedule and FlightsMap each inlined their own swap-cities
wrapper — three different class names and, in FlightsMap's case, a different
inline SVG. Angular keeps logic separate per filter (Schedule/FlightsMap
clear validation on swap, OnlineBoard doesn't) but its DOM is identical
across the three. Mirror that: ship a shared <SwapCityButton> that owns
the `.change-container > .button-change > .svg--change-city` markup and
CSS, keep each caller's onClick local.
Also align filter visuals: FlightsMapFilter row gap $space-m → $space-l to
match OnlineBoard/Schedule, and CityAutocomplete label gutter $space-s2 →
$space-m to match Angular's city-autocomplete.component.scss.
gnezim
848ba48484