Fix portrait artifact bank clipping on iPad.

Remove inner scroll cap so all draggables stay reachable via page scroll in vertical layout.

src/App.css

@@ -493,8 +493,8 @@
 
 @media (max-width: 52rem) {
   .artifact-bank__grid {
-    max-height: 28rem;
+    /* More columns in portrait — shorter bank, no inner scroll trap on iPad */
-    overflow-y: auto;
+    grid-template-columns: repeat(auto-fill, minmax(7rem, 1fr));
   }
 }