Analytika: landing event zachytava prvu navstevu aj s referrerom

Navsteva zacinajuca na / (preklik z FB/Messengeru, natukanie domeny)
doteraz nezanechala v page_views ziadny zaznam: / je v skip liste
beaconu a gate redirect na /auth je REPLACE navigacia, takze sa skipli
oba hopy a referrer sa stratil. trackLanding() v main.tsx posle raz za
kazdy plny load stranky pomenovany event landing s document.referrer.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

frontend/src/App.tsx

@@ -76,6 +76,8 @@ function AppInner() {
   // too -- that's the dashboard viewing its own traffic, not player usage.
   // Skip /, /lobby, /game -- high-frequency in-game navigation with no
   // analytical value; the backend drops these anyway (api/stats.py _SKIPPED_PATHS).
+  // The visitor's first touch (incl. landings on "/", which both skips would
+  // otherwise swallow) is captured by trackLanding() in main.tsx instead.
   useEffect(() => {
     if (navigationType === 'REPLACE') return;
     if (location.pathname.startsWith('/admin')) return;

frontend/src/lib/track.ts

@@ -10,3 +10,14 @@ export function trackEvent(path: string, referrer = '') {
     keepalive: true,
   }).catch(() => {});
 }
+
+/** One "landing" event per full page load — the visitor's first touch,
+ *  carrying document.referrer (e.g. facebook.com). Without it a visit that
+ *  starts on "/" leaves no trace at all: "/" is in the beacon's skip list and
+ *  the auth-gate redirect to /auth is a REPLACE navigation (see App.tsx), so
+ *  both hops are skipped. Not sent on /admin — the dashboard doesn't track
+ *  itself. */
+export function trackLanding() {
+  if (window.location.pathname.startsWith('/admin')) return;
+  trackEvent('landing', document.referrer);
+}

frontend/src/main.tsx

@@ -3,11 +3,15 @@ import ReactDOM from 'react-dom/client';
 import App from './App';
 import './index.css';
 import { setupSocketListeners, socket, setAuthToken } from './lib/socket';
+import { trackLanding } from './lib/track';
 
 setupSocketListeners();
 // Carry the stored session token into the handshake so the server auto-logs us in.
 setAuthToken(localStorage.getItem('bridzik_token'));
 socket.connect();
+// Here (not in a component effect): runs exactly once per full page load,
+// unaffected by StrictMode double-mounting.
+trackLanding();
 
 ReactDOM.createRoot(document.getElementById('root')!).render(
   <React.StrictMode>