DEV: Use the new more-topics API

assets/javascripts/initializers/related-topics.gjs

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+import { cached, tracked } from "@glimmer/tracking";
+import BasicTopicList from "discourse/components/basic-topic-list";
+import { withPluginApi } from "discourse/lib/plugin-api";
+import i18n from "discourse-common/helpers/i18n";
+
+const RelatedTopics = <template>
+  <div
+    role="complementary"
+    aria-labelledby="related-topics-title"
+    id="related-topics"
+    class="more-topics__list"
+  >
+    <h3 id="related-topics-title" class="more-topics__list-title">
+      {{i18n "discourse_ai.related_topics.title"}}
+    </h3>
+    <div class="topics">
+      <BasicTopicList @topics={{@topic.relatedTopics}} />
+    </div>
+  </div>
+</template>;
+
+export default {
+  name: "discourse-ai-related-topics",
+
+  initialize(container) {
+    const settings = container.lookup("service:site-settings");
+
+    if (
+      !settings.ai_embeddings_enabled ||
+      !settings.ai_embeddings_semantic_related_topics_enabled
+    ) {
+      return;
+    }
+
+    withPluginApi("1.37.2", (api) => {
+      api.registerMoreTopicsTab({
+        id: "related-topics",
+        name: i18n("discourse_ai.related_topics.pill"),
+        icon: "discourse-sparkles",
+        component: RelatedTopics,
+        condition: ({ topic }) => topic.relatedTopics?.length,
+      });
+
+      api.modifyClass(
+        "model:topic",
+        (Superclass) =>
+          class extends Superclass {
+            @tracked related_topics;
+
+            @cached
+            get relatedTopics() {
+              return this.related_topics?.map((topic) =>
+                this.store.createRecord("topic", topic)
+              );
+            }
+          }
+      );
+
+      api.modifyClass(
+        "model:post-stream",
+        (Superclass) =>
+          class extends Superclass {
+            _setSuggestedTopics(result) {
+              super._setSuggestedTopics(...arguments);
+              this.topic.related_topics = result.related_topics;
+            }
+          }
+      );
+    });
+  },
+};