Adicionou demo B126 cotovelo

X-Lovable-Edit-ID: edt-0d946be8-3f53-4818-a2c4-0244637c984e
Co-authored-by: Reifonas <211114984+Reifonas@users.noreply.github.com>

src/pages/Index.tsx

@@ -13,6 +13,7 @@ const Index = () => {
   const fileInputRef = useRef<HTMLInputElement>(null);
   const [loadingDemo, setLoadingDemo] = useState(false);
   const [loadingDemoIFC, setLoadingDemoIFC] = useState(false);
+  const [loadingDemoCotovelo, setLoadingDemoCotovelo] = useState(false);
   const [converting, setConverting] = useState(false);
   const { model, setModel, xrSupported, setXrSupported } = useModelStore();
 
@@ -94,6 +95,23 @@ const Index = () => {
     }
   }, [setModel]);
 
+  const handleLoadDemoCotovelo = useCallback(async () => {
+    setLoadingDemoCotovelo(true);
+    try {
+      const response = await fetch('/models/B126-COTOVELO.ifc');
+      const buffer = await response.arrayBuffer();
+      const result = await convertIFCtoGLB(buffer, 'B126-COTOVELO.ifc');
+      const url = URL.createObjectURL(result.blob);
+      setModel({ fileName: result.fileName, fileSize: result.fileSize, url });
+      toast.success('Modelo demo "B126 Cotovelo" (IFC) carregado!');
+    } catch (err) {
+      console.error(err);
+      toast.error('Falha ao converter modelo demo Cotovelo');
+    } finally {
+      setLoadingDemoCotovelo(false);
+    }
+  }, [setModel]);
+
   const handleEnterViewer = () => {
     if (!model) {
       toast.error('Importe um modelo GLB primeiro');
@@ -142,7 +160,7 @@ const Index = () => {
         </Button>
 
         {/* Demo buttons */}
-        <div className="grid grid-cols-2 gap-2">
+        <div className="grid grid-cols-3 gap-2">
           <Button
             variant="outline"
             className="h-12 w-full gap-2 border-muted-foreground/30 text-muted-foreground hover:border-primary hover:text-primary transition-all text-xs"
@@ -160,6 +178,15 @@ const Index = () => {
             {loadingDemoIFC ? <Loader2 className="h-4 w-4 animate-spin" /> : <Package className="h-4 w-4" />}
             {loadingDemoIFC ? 'Convertendo…' : 'Demo — 250 HP (IFC)'}
           </Button>
+
+          <Button
+            variant="outline"
+            className="h-12 w-full gap-2 border-muted-foreground/30 text-muted-foreground hover:border-primary hover:text-primary transition-all text-xs"
+            onClick={handleLoadDemoCotovelo}
+            disabled={loadingDemoCotovelo}>
+            {loadingDemoCotovelo ? <Loader2 className="h-4 w-4 animate-spin" /> : <Package className="h-4 w-4" />}
+            {loadingDemoCotovelo ? 'Convertendo…' : 'Demo — B126 Cotovelo (IFC)'}
+          </Button>
         </div>