Galaxy basemap: swap to VersaTiles Colorful, a found production style

The Driver ruled the current tiles not nice enough and asked for a
replacement FOUND online rather than authored here. Surveyed the free,
keyless MapLibre styles and measured their ocean colours: CARTO Voyager is
pale teal (#b0d0d6), OSM Americana has real blue but demo-only tile
hosting, VersaTiles Colorful has a true blue ocean (#bfd9f2) on a
maintained, production-free endpoint with 280 styled layers -- the closest
match to the Mapbox look among found styles.

One URL changed in the registry; the Mapbox side is untouched.

library/styles/registry.js

@@ -118,7 +118,12 @@ export const STYLE_REGISTRY = [
      background showing through outside the sphere (see DashboardMapPanel's .rd-map rule). */
   { id: 'galaxy',         label: 'Galaxy',         mood: 'the day side of Earth floating in space — normal land, blue oceans, black void behind the sphere',
     mapbox: 'mapbox://styles/mapbox/standard',
-    maplibre: 'https://tiles.openfreemap.org/styles/liberty',
+    // ★ FOUND, NOT AUTHORED (Driver: "I want it replaced with something you can find online").
+    // VersaTiles Colorful — a maintained, production-free, keyless style (280 layers) whose ocean
+    // is a real blue (#bfd9f2), the closest of the surveyed free styles to the Mapbox look. The
+    // alternatives measured and rejected: CARTO Voyager's water is pale teal #b0d0d6; OSM
+    // Americana has proper blue but its hosted tiles are a demo endpoint, not for production.
+    maplibre: 'https://tiles.versatiles.org/assets/styles/colorful/style.json',
     bestFor: ['research-dashboard', 'my-upg-100-list'] },
 ]