Add XR diagnostic logs

Added console-based diagnostics to XRSession.tsx to help debug AR session issues on Quest 3:
- Log store initialization and XR feature support checks via navigator.xr.
- Emit runtime logs for store state changes, session activation, and session end.
- Enhanced AR button to log click and wrap store.enterAR() with console traces for resolution/rejection.

X-Lovable-Edit-ID: edt-22fab2e4-d64c-4e9b-9ef2-093ce20274d8

src/pages/XRSession.tsx

@@ -10,11 +10,23 @@ import { ArrowLeft, Move, RotateCw, QrCode, Download, Crosshair } from 'lucide-r
 import { Button } from '@/components/ui/button';
 import { generateMarkerDownloadURL } from '@/lib/trackingMarker';
 
+// --- Diagnóstico XR ---
+console.log('[XR] Inicializando store...');
+console.log('[XR] navigator.xr disponível:', !!navigator.xr);
+if (navigator.xr) {
+  navigator.xr.isSessionSupported('immersive-ar').then((supported) => {
+    console.log('[XR] immersive-ar suportado:', supported);
+  }).catch((err) => {
+    console.error('[XR] Erro ao checar suporte AR:', err);
+  });
+}
+
 // --- XR Store at MODULE level (required by Quest 3 browser) ---
 const store = createXRStore({
   hand: { left: true, right: true },
   controller: { left: true, right: true },
 });
+console.log('[XR] Store criado com sucesso');
 
 // ─── XRModel ───────────────────────────────────────────
 function XRModel({ url }: { url: string }) {
@@ -160,13 +172,17 @@ const XRSession = () => {
 
   // Listen for XR session state changes
   useEffect(() => {
+    console.log('[XR] Subscribing to store state changes');
     const unsubscribe = store.subscribe((state) => {
+      console.log('[XR] Store state changed — session:', !!state.session, 'mode:', state.mode);
       const session = state.session;
       if (session && !inXR) {
+        console.log('[XR] ✅ Sessão AR ativa! Features:', (session as any).enabledFeatures);
         setInXR(true);
         setAnchorMode('manual');
         toast.success('Sessão AR iniciada!');
         session.addEventListener('end', () => {
+          console.log('[XR] ❌ Sessão AR encerrada');
           setInXR(false);
           setAnchorMode('manual');
         });
@@ -208,7 +224,7 @@ const XRSession = () => {
                 <span className="font-mono text-xs">Marcador QR</span>
               </Button>
               {/* CRITICAL: Direct call without async wrapper to preserve user gesture */}
-              <Button className="gap-2 glow-primary" onClick={() => store.enterAR()}>
+              <Button className="gap-2 glow-primary" onClick={() => { console.log('[XR] Botão AR clicado — chamando store.enterAR()'); store.enterAR().then((s) => console.log('[XR] enterAR resolveu:', s)).catch((e) => console.error('[XR] enterAR rejeitado:', e)); }}>
                 Iniciar Sessão AR
               </Button>
             </>