Cap object group card shared width

patterns/object-group-card.html

@@ -117,7 +117,9 @@
         }
 
         const referenceWidth = referenceCard.getBoundingClientRect().width;
-        grid.style.setProperty('--layout-object-card-shared-width', `${referenceWidth}px`);
+        const maxWidth = parseFloat(getComputedStyle(referenceCard).maxWidth);
+        const sharedWidth = Number.isFinite(maxWidth) ? Math.min(referenceWidth, maxWidth) : referenceWidth;
+        grid.style.setProperty('--layout-object-card-shared-width', `${sharedWidth}px`);
         grid.classList.add('sg-object-card-grid--multi-row');
       });
     };