ImageScSearcher: handle tag objects in Discourse API response

Newer Discourse versions return tags as objects {id, name, slug}
rather than plain strings, causing an UnsupportedOperationException.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: ctrueden

src/main/java/org/scijava/search/web/ImageScSearcher.java

@@ -121,7 +121,7 @@ private void appendTopicMaps(JsonObject t,
 		Map<String, String> topicTitleMap, Map<String, String> topicTagMap)
 	{
 		topicTitleMap.put(get(t, "id"), get(t, "title"));
-		topicTagMap.put(get(t, "id"), String.join(", ", StreamSupport.stream(t.get("tags").getAsJsonArray().spliterator(), false).map(j -> j.getAsString()).collect(Collectors.toList())));
+		topicTagMap.put(get(t, "id"), String.join(", ", StreamSupport.stream(t.get("tags").getAsJsonArray().spliterator(), false).map(j -> j.isJsonObject() ? j.getAsJsonObject().get("name").getAsString() : j.getAsString()).collect(Collectors.toList())));
 	}
 
 	private SearchResult createResult(JsonObject post, Map<String, String> topics, Map<String, String> tags) {