Fix arrow sizing

src/lib/checkbox-tree/checkbox-tree.css

@@ -36,6 +36,10 @@
     font: inherit;
 }
 
+.checkbox-tree__toggle[aria-expanded="true"] {
+    transform: rotate(90deg);
+}
+
 .checkbox-tree__toggle:focus-visible {
     outline: 2px solid currentColor;
     outline-offset: 1px;

src/lib/checkbox-tree/checkbox-tree.js

@@ -201,7 +201,6 @@ export class CheckboxTree {
         toggle.setAttribute('aria-expanded', String(expanded));
         const label = this.nodesById.get(item.dataset.nodeId)?.label ?? 'branch';
         toggle.setAttribute('aria-label', `${expanded ? 'Collapse' : 'Expand'} ${label}`);
-        toggle.textContent = expanded ? '▼' : '▶';
     }
 
     directChildrenContainer(item) {