Hide env-builder toolbar hint on narrow screens

env-builder.html

@@ -734,6 +734,10 @@ body {
 ::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 4px; }
 
 /* ── Responsive ── */
+
+@media (max-width: 1100px) {
+  .toolbar-hint { display: none; }
+}
 @media (max-width: 900px) {
   :root { --panel-w: 280px; --sidebar-w: 180px; }
 }