Places fell back to a flat themed background (blankStyle) when no Protomaps
.pmtiles basemap was present, so the map was just a grey void behind the
photo markers.
Replace that with worldStyle(): a MapLibre GL v8 style that draws land masses
and country borders over a themed ocean, sourced from a bundled Natural Earth
110m outline (public domain). The asset is geometry-only (properties stripped,
coords rounded to 2 decimals) — 177 features (148 Polygon + 29 MultiPolygon),
~165 KB — served same-origin at /geo/world-110m.geojson, so no external tiles
(CSP connect-src 'self' friendly) and no per-instance basemap install. A full
Protomaps basemap still takes precedence when one is installed.
Also add a quiet map 'error' handler: if the outline is ever missing, the SPA
fallback serves index.html (text/html) which MapLibre can't parse as GeoJSON;
markers still render over the ocean layer, so swallow the error rather than
logging to the console (mirrors the checkBasemap content-type guard).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
DioCrafts
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