style(next): improve the window dragging functionality for the horizontal toolbar layout

Author: adoriandoran

src/public/stylesheets/theme-next/shell.css

@@ -895,6 +895,11 @@ body.layout-vertical.electron.platform-darwin .tab-row-container {
 
 body.layout-horizontal .tab-row-container {
     padding-top: calc((var(--tab-bar-height) - var(--tab-height)));
+    -webkit-app-region: drag;
+}
+
+body.layout-horizontal .tab-row-container > * {
+    -webkit-app-region: no-drag; /* Limit the drag area only for the parent element */
 }
 
 body.layout-horizontal .tab-row-widget-container {