Extract textures via Canvas Base64 fallback to prevent revoked blob URL errors

src/pages/Editor.tsx

@@ -1373,8 +1373,24 @@ export default function Editor() {
             
             const extractTextureUrl = (texture: any) => {
               if (!texture) return undefined;
-              if (texture.image && typeof texture.image.src === 'string') return texture.image.src;
-              if (texture.source && texture.source.data && typeof texture.source.data.src === 'string') return texture.source.data.src;
+              const img = texture.image || (texture.source && texture.source.data);
+              if (!img) return undefined;
+              if (typeof img.src === 'string' && img.src.length > 0) return img.src;
+              if (typeof img.currentSrc === 'string' && img.currentSrc.length > 0) return img.currentSrc;
+              
+              // Fallback: draw ImageBitmap or HTMLImageElement to canvas to extract data URL
+              try {
+                const canvas = document.createElement('canvas');
+                canvas.width = img.width || 1024;
+                canvas.height = img.height || 1024;
+                const ctx = canvas.getContext('2d');
+                if (ctx) {
+                  ctx.drawImage(img, 0, 0);
+                  return canvas.toDataURL('image/png');
+                }
+              } catch (e) {
+                console.error('Error extracting texture URL:', e);
+              }
               return undefined;
             };