Fix AI course generator issue

src/components/TopicDetail/TopicDetailAI.tsx

@@ -208,6 +208,19 @@ export function TopicDetailAI(props: TopicDetailAIProps) {
             {roadmapTreeMapping?.subjects?.length === 0 && (
               <a
                 target="_blank"
+                onClick={(e) => {
+                  if (!isLoggedIn()) {
+                    e.preventDefault();
+                    onLogin();
+                    return;
+                  }
+
+                  if (isLimitExceeded) {
+                    e.preventDefault();
+                    onUpgrade();
+                    return;
+                  }
+                }}
                 href={`/ai/course/search?term=${roadmapTreeMapping?.text}&difficulty=beginner&src=topic`}
                 className="flex items-center gap-1 rounded-md border border-gray-300 bg-gray-100 px-2 py-1 hover:bg-gray-200 hover:text-black [&>svg:last-child]:hidden"
               >