Bundle Wikidata cities for offline place lookups

A pack of the world's settlements of 15,000 people or more (31,827 places,
1.6 MB, CC0) built from the Wikidata Query Service by
scripts/build-wikidata-cities.mjs. src/data/wikidataCities.js reads it on the
first lookup and answers the nearest city to a point, the cities around it,
a city by name ("Paris, France", or the nearest namesake in view) and a
country's name in the page language. Names match without accents or case.

The build leaves out groupings of settlements (metropolitan areas,
agglomerations) and places that no longer stand, keeps a city that is also a
narrower grouping kind (Istanbul) or a unit dissolved where nothing else
names the spot (the Vietnamese provincial cities of 2025), fills a country
from the area a place lies in, splits a population band the service cannot
answer in time, and fails if well-known cities are missing or a known
grouping gets in. The app never calls Wikidata itself.

Co-authored-by: Sameh Khamis <[email protected]>

scripts/format-scope.json

@@ -1465,5 +1465,8 @@
   "src/ui/styles/cockpit-panels.css",
   "src/ui/styles/layer-section-index.css",
   "src/ui/styles/layer-finder.css",
-  "src/ui/layerFinder.test.mjs"
+  "src/ui/layerFinder.test.mjs",
+  "src/data/wikidataCities.js",
+  "src/data/wikidataCities.test.mjs",
+  "scripts/build-wikidata-cities.mjs"
 ]