[fix](trx-frontend-http): expose reverseGeocodeLocation on window.trx.map namespace

Function was defined in map-core.js but not exported, causing a TypeError
when app.js called window.trx.map.reverseGeocodeLocation().

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Signed-off-by: Stan Grams <sjg@haxx.space>

src/trx-client/trx-frontend/trx-frontend-http/assets/web/map-core.js

@@ -3481,6 +3481,7 @@
     materializeBufferedMapLayers,
     flushDeferredDecodeMapSync,
     bandForHz,
+    reverseGeocodeLocation,
   };
 
   // If the map tab is already visible (direct /map URL), init immediately.