[propcgamer20-png]

What this changes

Closes #295. In ClusteredMarkers:

• places.find(...) per pin is replaced by a Map built once in useMemo from places.
• pinIcon now takes a place type and returns one cached L.DivIcon per type (exported for testing).
• clusterIcon is cached by the per-type counts, so a cluster whose contents did not change keeps the same icon object. react-leaflet only calls marker.setIcon when the icon object changes, so unchanged pins and clusters are no longer rewritten on every moveend and zoomend.

Markup and styling of pins and clusters are unchanged.

Type of change

• New public place(s)
• New or updated benefit guide
• New or updated resource link
• Code or fix
• Docs

Verification

• npm run typecheck, npm run lint and npm run test:unit pass (601 tests, 2 new in map-view.test.tsx: same instance for the same type, different instance for a different type).
• Not done: I did not measure L.Marker.prototype.setIcon call counts while panning in npm run dev, so there is no before and after count yet. That acceptance item is still open.

Checklist

• The site hosts no copyrighted files; resource and paper changes are links only.
• No em dashes in any copy.

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