DEV: include excerpt-expanded class when gists are enabled (#1267)

Author: awesomerobot

assets/javascripts/initializers/ai-gist-topic-list-class.js

@@ -0,0 +1,19 @@
+import { apiInitializer } from "discourse/lib/api";
+
+export default apiInitializer("1.15.0", (api) => {
+  const gistService = api.container.lookup("service:gists");
+
+  api.registerValueTransformer(
+    "topic-list-item-class",
+    ({ value, context }) => {
+      const shouldShow =
+        gistService.preference === "table-ai" && gistService.shouldShow;
+
+      if (context.topic.get("ai_topic_gist") && shouldShow) {
+        value.push("excerpt-expanded");
+      }
+
+      return value;
+    }
+  );
+});