Add loading indicator for search queries

app/components/search-box.gjs

@@ -8,7 +8,7 @@ import { task, timeout } from 'ember-concurrency';
 import Icon from '#components/icon';
 import humanizeOsmTag from '../helpers/humanize-osm-tag';
 import { POI_CATEGORIES } from '../utils/poi-categories';
-import eq from 'ember-truth-helpers/helpers/eq';
+import { eq, or } from 'ember-truth-helpers';
 
 export default class SearchBoxComponent extends Component {
   @service photon;
@@ -211,7 +211,11 @@ export default class SearchBoxComponent extends Component {
         />
 
         <button type="submit" class="search-submit-btn" aria-label="Search">
-          <Icon @name="search" @size={{20}} @color="#5f6368" />
+          {{#if (or (eq this.mapUi.loadingState.type "text") (eq this.mapUi.loadingState.type "category"))}}
+            <Icon @name="loading-ring" @size={{20}} />
+          {{else}}
+            <Icon @name="search" @size={{20}} @color="#5f6368" />
+          {{/if}}
         </button>
 
         {{#if this.query}}