fix(geocode): a region match takes the place itself, not a name starting with it

A name that only started with the place word also matched, so from Lyon
"Paris, France" picked "Paris Gare de Lyon" in the biased pass, where main
fell through to the unbiased answer and reached Paris. Only an exact name
matches now. Adds a test for the UK alias.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/keylessGeocoder.js

@@ -294,7 +294,9 @@ export function selectQualifiedFeature(features, query) {
     (Array.isArray(features) ? features : []).find((feature) => {
       const properties = feature?.properties ?? {};
       const name = normalizeToponym(properties.name);
-      if (name !== head && !name.startsWith(`${head} `)) return false;
+      // Exactly the place: "Paris Gare de Lyon" is in France too, but it
+      // is not what "Paris, France" asks for.
+      if (name !== head) return false;
       const where = ` ${normalizeToponym(
         [
           properties.city,

src/keylessGeocoder.test.mjs

@@ -512,3 +512,51 @@ test('"USA" and "UK" name their countries, and a trailing comma keeps the nearby
   assert.equal(Math.round(result.lat), 34, `got ${result.label}`);
   assert.equal(fetchImpl.urls.length, 1);
 });
+
+test('a region match takes the place itself, not a place whose name starts with it', () => {
+  const station = {
+    geometry: { type: 'Point', coordinates: [4.86, 45.76] },
+    properties: {
+      osm_key: 'railway',
+      name: 'Paris Gare de Lyon',
+      city: 'Lyon',
+      country: 'France',
+      countrycode: 'FR',
+    },
+  };
+  const paris = {
+    geometry: { type: 'Point', coordinates: [2.35, 48.86] },
+    properties: {
+      osm_key: 'place',
+      name: 'Paris',
+      state: 'Île-de-France',
+      country: 'France',
+      countrycode: 'FR',
+    },
+  };
+  assert.equal(selectQualifiedFeature([station, paris], 'Paris, France'), paris);
+  assert.equal(selectQualifiedFeature([station], 'Paris, France'), null);
+});
+
+test('"UK" names the United Kingdom', () => {
+  const london = {
+    geometry: { type: 'Point', coordinates: [-0.13, 51.51] },
+    properties: {
+      osm_key: 'place',
+      name: 'London',
+      country: 'United Kingdom',
+      countrycode: 'GB',
+    },
+  };
+  const ontario = {
+    geometry: { type: 'Point', coordinates: [-81.25, 42.98] },
+    properties: {
+      osm_key: 'place',
+      name: 'London',
+      state: 'Ontario',
+      country: 'Canada',
+      countrycode: 'CA',
+    },
+  };
+  assert.equal(selectQualifiedFeature([ontario, london], 'London, UK'), london);
+});