Clipboard error surfacing + Cloning Designer frame correctness

dee/static/app.css

@@ -2892,6 +2892,17 @@ input:focus, textarea:focus, select:focus {
 .toast-msg { line-height: 1.4; }
 .toast-warn { background: #78350F; }
 .toast-warn .toast-check { background: var(--warning); }
+/* Error toasts get the most aggressive treatment — red border + saturated
+ * background — because they're shown when the clipboard write fails, which
+ * is one of our highest-stakes user errors: failing to copy DNA before
+ * opening a vendor's order form means whatever was previously on the
+ * clipboard gets pasted instead. The user MUST see this. */
+.toast-error {
+    background: #7F1D1D;
+    border: 1px solid #DC2626;
+    box-shadow: 0 6px 24px rgba(220, 38, 38, 0.32);
+}
+.toast-error .toast-check { background: var(--danger, #DC2626); content: '!'; }
 
 /* =========================================================== RESPONSIVE
  * Mobile-first stack: