Fix UV canvas CORS tainting preventing image export

src/components/UVEditor.tsx

@@ -52,6 +52,7 @@ export function UVEditor({ onClose, onSave, targetObject, loadedModel, sceneObje
       const init: Layer[] = saved.map((l: any) => ({ ...l }));
       init.forEach(layer => {
         const img = new Image();
+        img.crossOrigin = "anonymous";
         img.onload = () => { layer.img = img; n++; if (n === init.length) setLayers([...init]); };
         img.src = layer.url;
       });
@@ -59,6 +60,7 @@ export function UVEditor({ onClose, onSave, targetObject, loadedModel, sceneObje
       // If no saved layers but there's a base map texture, load it as the initial layer
       const url = targetObject.materialProps.map;
       const img = new Image();
+      img.crossOrigin = "anonymous";
       img.onload = () => {
         // Automatically scale the image so it fits the 1024x1024 canvas exactly
         const scaleX = CANVAS_SIZE / img.width;
@@ -104,7 +106,12 @@ export function UVEditor({ onClose, onSave, targetObject, loadedModel, sceneObje
       ctx.drawImage(layer.img, sx, sy, sw, sh, -sw / 2, -sh / 2, sw, sh);
       ctx.restore();
     });
+    try {
       return c.toDataURL(transparent ? 'image/png' : 'image/jpeg');
+    } catch (e) {
+      console.error("Canvas render error (likely CORS taint):", e);
+      return "";
+    }
   }, []);
 
   useEffect(() => {