syncAttribClearance() measured the strip it must clear from Mapbox's credit
(.mapboxgl-ctrl-attrib) and our own (.doxa-attribution), never from MapLibre's
(.maplibregl-ctrl-attrib). MapLibre is the default engine. With no match, the
clearance stayed at the 20px fallback. On a phone the MapLibre credit wraps to two
lines, and the "Tap a coloured dot" pill covered it: a licence-required credit
hidden on every map that mounts the hint.
Measured at 390x844 on DX Life's home page (Prayer Progress), on the shared
browser: MapLibre en and ar, pill over the credit by 35px with the clearance at
20px; Mapbox, clearance 72px and 0px overlap.
The selector now also takes .maplibregl-ctrl-bottom-right .maplibregl-ctrl-attrib
and the MapLibre form of our own credit line. The existing measure (the strip from
the credit's top to the box's bottom) and its ResizeObserver then apply unchanged.
Proved on the live DOM, inside the map's shadow root: on MapLibre the old selector
finds nothing and the new one finds the credit; on Mapbox both find it.
Library only. Every ProfileLoader consumer needs a rebuild to ship it.
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