fix(map): stabilize layers menu and offline cache UX

scripts/map-search.test.mjs

@@ -85,7 +85,7 @@ test("reference subjects remain searchable by profile labels without a provider
     id: "map.reference.station.v1",
     title: "Метро",
     semanticTypes: ["map.station"],
-    label: { mode: "attributes", fields: ["name", "official_name"] },
+    label: { mode: "attributes", fields: ["name", "official_name", "alternate_names"] },
   };
   const index = buildMapSearchIndex({
     runtimeBindings: [{
@@ -93,6 +93,7 @@ test("reference subjects remain searchable by profile labels without a provider
       presentationProfileId: stationProfile.id,
       facts: [point("osm.node.1", "map.station", {
         name: "Петроградская",
+        alternate_names: ["Petrogradskaya station"],
         provider_note: "not searchable",
       })],
     }],
@@ -100,6 +101,7 @@ test("reference subjects remain searchable by profile labels without a provider
   });
 
   assert.equal(searchMapSubjects(index, "петрог").at(0)?.title, "Петроградская");
+  assert.equal(searchMapSubjects(index, "Petrogradskaya").at(0)?.sourceId, "osm.node.1");
   assert.equal(searchMapSubjects(index, "osm.node.1").at(0)?.groupTitle, "Метро");
   assert.deepEqual(searchMapSubjects(index, "provider_note"), []);
 });