fix: remove_overlay_elements functionality by calling injected JS function. ref: #1396

- Fix critical bug where overlay removal JS function was injected but never called
  - Change remove_overlay_elements() to properly execute the injected async function
  - Wrap JS execution in async to handle the async overlay removal logic
  - Add test_remove_overlay_elements() test case to verify functionality works
  - Ensure overlay elements (cookie banners, popups, modals) are actually removed

  The remove_overlay_elements feature now works as intended:
  - Before: Function definition injected but never executed (silent failure)
  - After: Function injected and called, successfully removing overlay elements

crawl4ai/async_crawler_strategy.py

@@ -1383,9 +1383,10 @@ class AsyncPlaywrightCrawlerStrategy(AsyncCrawlerStrategy):
         try:
             await self.adapter.evaluate(page,
                 f"""
-                (() => {{
+                (async () => {{
                     try {{
-                        {remove_overlays_js}
+                        const removeOverlays = {remove_overlays_js};
+                        await removeOverlays();
                         return {{ success: true }};
                     }} catch (error) {{
                         return {{