Closed-by-default disclosure below City/Country holding a city/country
geocode lookup (Open-Meteo, city-only query with client-side country
ranking), a single-marker draggable MapLibre preview (lazy-loaded via
location-map.js), and the relocated lat/lng fields. GPS button, search
pick, pin drag, and typed values all stay in sync via syncPinFromFields(),
with a visual mismatch flag for unparseable typed input.
Built entirely in JS (mirrors the existing 'More options' disclosure
pattern) so post-form.html.twig needs no template change.
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