The connectivity map is built raw (new gl.Map), not through useMapInstance, so
it never handed the engine a UI locale: the canvas's "Map" name, "Zoom in",
"Toggle attribution" and the gesture hints stayed English under ar on both
engines (rega, row 34, _qa-cycle/rega/rows31-34-0f136d25/).
It now passes locale: engineUiLocale(readerLang(), provider) at construction,
with the same reader-language ladder useMapInstance uses (ProfileLoader's lang,
profile-config, ?lang=, <html lang>). The provider argument is ready for
studio's per-engine logo label; today's engineUiLocale ignores it.
Headless: the bundle builds and carries the engine key map (Map.Title...), the
ar catalogue has mapui.map = "الخريطة", and check:no-free-identifiers,
profiles-mount and universal-props pass. Not rendered in a browser.
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