Simplify initial field focus logic in form prop component

Replaces the IntersectionObserver-based focus logic with a simpler requestAnimationFrame approach for focusing the first field. This reduces complexity and potential timing issues when focusing the field after view initialization.

npm/ng-packs/packages/components/extensible/src/lib/components/extensible-form/extensible-form-prop.component.ts

@@ -155,33 +155,10 @@ export class ExtensibleFormPropComponent implements OnChanges, AfterViewInit {
 
   ngAfterViewInit() {
     if (this.isFirstGroup && this.first && this.fieldRef) {
-      this.focusField();
-    }
-  }
-
-  private focusField() {
-    const element = this.fieldRef.nativeElement;
-    
-    if (this.isElementVisible(element)) {
-      element.focus();
-      return;
-    }
-
-    const observer = new IntersectionObserver((entries) => {
-      entries.forEach(entry => {
-        if (entry.isIntersecting && entry.intersectionRatio > 0) {
-          element.focus();
-          observer.disconnect();
-        }
+      requestAnimationFrame(() => {
+        this.fieldRef.nativeElement.focus();
       });
-    }, { threshold: 0.01 });
-
-    observer.observe(element);
-    setTimeout(() => observer.disconnect(), 5000);
-  }
-
-  private isElementVisible(element: HTMLElement): boolean {
-    return element.offsetParent !== null;
+    }
   }
 
   getComponent(prop: FormProp): string {