style(editor): keep the formatting toolbar on one row

Author: dnlblasco

resources/css/editor-extras.css

@@ -216,3 +216,12 @@
     width: auto;
     margin-right: 8px;
 }
+
+/* The original laid its format buttons out with inline styles inside the
+   toolbar; the class itself only carries a margin, so the row lives here. */
+.minimessage-toolbar {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 4px;
+    align-items: center;
+}