Ajustou grid em -0,1m

X-Lovable-Edit-ID: edt-d994412c-b8db-40a0-b0cc-c8c68aebbcc5
Co-authored-by: Reifonas <211114984+Reifonas@users.noreply.github.com>

src/components/three/ModelViewer.tsx

@@ -440,6 +440,7 @@ function GridLayer() {
   if (!showGrid) return null;
   return (
     <Grid
+      position={[0, -0.1, 0]}
       infiniteGrid
       cellSize={0.01}
       sectionSize={0.1}

src/pages/XRSession.tsx

@@ -331,6 +331,7 @@ function XRGrid() {
   if (!showGrid) return null;
   return (
     <Grid
+      position={[0, -0.1, 0]}
       infiniteGrid
       cellSize={0.01}
       sectionSize={0.1}