refactor(ads): replace direct AdWidget usage with dispatcher widget

- Convert AdFeedItemWidget from StatefulWidget to StatelessWidget
- Remove direct usage of google_mobile_ads NativeAd and AdWidget
- Introduce support for AdMob native ads via AdMobNativeAdWidget
- Add

Author: fulleni

lib/shared/widgets/ads/ad_feed_item_widget.dart

@@ -1,65 +1,47 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_news_app_mobile_client_full_source_code/ads/models/ad_feed_item.dart';
-import 'package:google_mobile_ads/google_mobile_ads.dart';
+import 'package:flutter_news_app_mobile_client_full_source_code/ads/widgets/admob_native_ad_widget.dart';
+import 'package:google_mobile_ads/google_mobile_ads.dart' as admob;
 import 'package:ui_kit/ui_kit.dart';
 
 /// {@template ad_feed_item_widget}
 /// A widget responsible for rendering a native ad within the feed.
 ///
-/// This widget takes an [AdFeedItem] and uses the `AdWidget` from the
-/// `google_mobile_ads` package to display the underlying [NativeAd].
-/// It also handles the disposal of the ad object to prevent memory leaks.
+/// This widget acts as a dispatcher, taking an [AdFeedItem] and delegating
+/// the actual rendering to the appropriate provider-specific ad widget
+/// (e.g., [AdMobNativeAdWidget]).
 /// {@endtemplate}
-class AdFeedItemWidget extends StatefulWidget {
+class AdFeedItemWidget extends StatelessWidget {
   /// {@macro ad_feed_item_widget}
   const AdFeedItemWidget({required this.adFeedItem, super.key});
 
   /// The ad feed item containing the loaded native ad to be displayed.
   final AdFeedItem adFeedItem;
 
-  @override
-  State<AdFeedItemWidget> createState() => _AdFeedItemWidgetState();
-}
-
-class _AdFeedItemWidgetState extends State<AdFeedItemWidget> {
-  NativeAd? _nativeAd;
-  bool _isAdLoaded = false;
-
-  @override
-  void initState() {
-    super.initState();
-    _nativeAd = widget.adFeedItem.nativeAd;
-    // The ad is typically already loaded by the AdService before being passed here.
-    // We can set the state to reflect this.
-    if (_nativeAd != null) {
-      _isAdLoaded = true;
-    }
-  }
-
-  @override
-  void dispose() {
-    // Dispose the native ad when the widget is removed from the tree.
-    _nativeAd?.dispose();
-    super.dispose();
-  }
-
   @override
   Widget build(BuildContext context) {
-    final nativeAd = _nativeAd;
-    if (!_isAdLoaded || nativeAd == null) {
-      // If the ad is not loaded for any reason, return an empty container.
+    // Determine the type of the underlying ad object to dispatch to the
+    // correct rendering widget.
+    // For now, we only support AdMob, but this can be extended.
+    if (adFeedItem.nativeAd.adObject is admob.NativeAd) {
+      return Card(
+        margin: const EdgeInsets.symmetric(
+          vertical: AppSpacing.sm,
+          horizontal: AppSpacing.lg,
+        ),
+        child: SizedBox(
+          height: 120, // Fixed height for the ad card
+          child: AdMobNativeAdWidget(nativeAd: adFeedItem.nativeAd),
+        ),
+      );
+    } else {
+      // Fallback for unsupported ad types or if adObject is null/unexpected.
+      // In a production app, you might log this or show a generic error ad.
+      debugPrint(
+        'AdFeedItemWidget: Unsupported native ad type: '
+        '${adFeedItem.nativeAd.adObject.runtimeType}.',
+      );
       return const SizedBox.shrink();
     }
-
-    return Card(
-      margin: const EdgeInsets.symmetric(
-        vertical: AppSpacing.sm,
-        horizontal: AppSpacing.lg,
-      ),
-      child: SizedBox(
-        height: 120,
-        child: AdWidget(ad: nativeAd),
-      ),
-    );
   }
 }