Four lenses (send-map, lang-cluster, the cockpit's MapCell and FlowerClusters)
called setProjectionOn(m, 'mercator') straight after initializeMap(). MapLibre
throws "Style is not done loading" from setProjection before the style loads;
setProjectionOn swallows it and returns false, so on MapLibre the projection was
never set (rega, C2 at 0f136d25). Mapbox accepts it early, which is why only
one engine showed it.
A small plugin helper, src/whenStyleReady.js, runs the call at once if the style
has loaded, else on 'style.load'. Headless, against a MapLibre-shaped map that
throws before load, with the real setProjectionOn: before, it returns false and
the projection stays null; after, it is mercator, both when the style loads
later and when it is already loaded.
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