feat: implement Learning Tracer (heartbeat duration tracking) for LPK Audit

resources/js/Pages/Courses/Player.tsx

@@ -148,6 +148,22 @@ export default function Player({ course, currentLesson, progress, auth }: Player
     const [sidebarOpen, setSidebarOpen] = useState(true);
     const [isPlaying, setIsPlaying] = useState<string | null>(null);
 
+    // Learning Tracer - Heartbeat every 60 seconds
+    useEffect(() => {
+        const interval = setInterval(() => {
+            // @ts-ignore
+            router.post(route('lessons.heartbeat', { lesson: currentLesson.id }), {}, {
+                preserveScroll: true,
+                preserveState: true,
+                only: [], // Prevent any data reload to keep it "silent"
+                // @ts-ignore
+                onFinish: () => {} 
+            });
+        }, 60000);
+
+        return () => clearInterval(interval);
+    }, [currentLesson.id]);
+
     const handleComplete = () => {
         // @ts-ignore
         router.post(route('lessons.complete', { lesson: currentLesson.id }));