Fix: Trigger popover update on slot content change

Adds a slotchange event handler to the slot in UUIPopoverContainerElement. This ensures the popover updates when its slotted content changes by calling #initUpdate within a requestAnimationFrame.

Author: madsrasmussen

packages/uui-popover-container/lib/uui-popover-container.element.ts

@@ -351,8 +351,14 @@ export class UUIPopoverContainerElement extends LitElement {
     this.#scrollParents.push(document.body);
   }
 
+  #onSlotChange() {
+    requestAnimationFrame(() => {
+      this.#initUpdate();
+    });
+  }
+
   render() {
-    return html`<slot></slot>`;
+    return html`<slot @slotchange=${this.#onSlotChange}></slot>`;
   }
 
   static styles = [