Ensure map marker clicks preserve search context

Fixes the back button just closing the sidebar and clearing the whole
search after having seleted a result via map marker

app/templates/place.gjs

@@ -77,9 +77,11 @@ export default class PlaceTemplate extends Component {
   navigateBack(place) {
     // The sidebar calls this with null when "Back" is clicked.
     if (place === null) {
-      // If we came from search results, go back in history
-      if (this.mapUi.returnToSearch) {
-        window.history.back();
+      // If we have an active search context, return to it (UP navigation)
+      if (this.mapUi.returnToSearch && this.mapUi.currentSearch) {
+        this.router.transitionTo('search', { 
+          queryParams: this.mapUi.currentSearch 
+        });
       } else {
         // Otherwise just close the sidebar (return to map index)
         this.router.transitionTo('index');

app/templates/search.gjs

@@ -11,6 +11,8 @@ export default class SearchTemplate extends Component {
   selectPlace(place) {
     if (place) {
       this.mapUi.returnToSearch = true;
+      // We don't need to manually set currentSearch here because
+      // it was already set in the route's setupController
       this.router.transitionTo('place', place);
     }
   }