connectivity-map builds its map raw (new gl.Map), not through useMapInstance, so
nothing injected the engine stylesheet into its shadow root. A document-level
<link> never reaches it. Mapbox's own CSS canary reported "missing CSS
declarations", and controls and markers had no rules to position them.
useMapInstance's ensureEngineCSS is now exported, and connectivity-map calls it
with engineStylesheetUrl(provider) before new gl.Map, re-checking afterwards that
the pane is still mounted. Maps that already use useMapInstance are unchanged.
gospel-resources/resources-map has the same raw-map shape and can make the same
call; that is its owner's change.
Measured with verify-map-paint on a served built tree: main failed both leaves
(canary not salmon, "missing CSS declarations"). This build passes
connectivity-map (live GL, engine CSS applied, 0 unclassified errors).
resources-map still fails, as expected until it adds the call.
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