feat: extract collapsible container into partial

assets/controllers/toggle_controller.js

@@ -2,7 +2,7 @@ import {Controller} from '@hotwired/stimulus'
 
 export default class extends Controller {
     static classes = ['closed', 'open', 'iconOpen']
-    static targets = ['content', 'icon', 'container']
+    static targets = ['content', 'icon', 'container', 'trigger']
     static values = {
         open: {
             type: Boolean,
@@ -43,6 +43,10 @@ export default class extends Controller {
             this.iconTarget.classList.toggle(iconClass, true === open)
         }
 
+        if (this.hasTriggerTarget) {
+            this.triggerTarget.setAttribute('aria-expanded', String(open))
+        }
+
         // Toggle class on container element (or controller element) if specified
         if (this.hasOpenClass) {
             const container = this.hasContainerTarget ? this.containerTarget : this.element