Add color swatches to layer groups (tentative)

js/controllers/menu_controller.js

@@ -164,7 +164,10 @@ export default class extends Controller {
         trigger.className = 'btn btn-link p-0 fs-6 fw-bold text-decoration-none text-reset';
         trigger.setAttribute('data-bs-toggle', 'collapse');
         trigger.setAttribute('data-bs-target', `#group-${cleanId}`);
-        trigger.innerHTML = `<i class="bi bi-chevron-down me-1"></i>${node.id}`;
+        trigger.innerHTML = `
+            <i class="bi bi-chevron-down me-1"></i>${node.id}
+            <div class="d-inline-block border rounded ms-2" style="background-color: ${node.color}; height: 15px; width:15px"></div>
+        `;
 
         const collapseDiv = document.createElement('div');
         collapseDiv.className = 'collapse';