feat(ads): implement interstitial ad triggering on article navigation

- Add InterstitialAdManager import to headline_details_page.dart
- Integrate onPotentialAdTrigger call before navigating to entity details
- Implement interstitial ad trigger for similar headline taps

Author: fulleni

lib/headline-details/view/headline_details_page.dart

@@ -8,6 +8,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:flutter_news_app_mobile_client_full_source_code/account/bloc/account_bloc.dart';
 import 'package:flutter_news_app_mobile_client_full_source_code/ads/ad_service.dart';
+import 'package:flutter_news_app_mobile_client_full_source_code/ads/interstitial_ad_manager.dart';
 import 'package:flutter_news_app_mobile_client_full_source_code/ads/models/ad_theme_style.dart';
 import 'package:flutter_news_app_mobile_client_full_source_code/ads/widgets/in_article_ad_loader_widget.dart';
 import 'package:flutter_news_app_mobile_client_full_source_code/app/bloc/app_bloc.dart';
@@ -521,6 +522,9 @@ class _HeadlineDetailsPageState extends State<HeadlineDetailsPage> {
       ..add(
         InkWell(
           onTap: () {
+            context
+                .read<InterstitialAdManager>()
+                .onPotentialAdTrigger(context: context);
             context.pushNamed(
               Routes.entityDetailsName,
               pathParameters: {
@@ -549,6 +553,9 @@ class _HeadlineDetailsPageState extends State<HeadlineDetailsPage> {
       ..add(
         InkWell(
           onTap: () {
+            context
+                .read<InterstitialAdManager>()
+                .onPotentialAdTrigger(context: context);
             context.pushNamed(
               Routes.entityDetailsName,
               pathParameters: {
@@ -577,6 +584,9 @@ class _HeadlineDetailsPageState extends State<HeadlineDetailsPage> {
       ..add(
         InkWell(
           onTap: () {
+            context
+                .read<InterstitialAdManager>()
+                .onPotentialAdTrigger(context: context);
             context.pushNamed(
               Routes.entityDetailsName,
               pathParameters: {
@@ -662,29 +672,44 @@ class _HeadlineDetailsPageState extends State<HeadlineDetailsPage> {
                       case HeadlineImageStyle.hidden:
                         tile = HeadlineTileTextOnly(
                           headline: similarHeadline,
-                          onHeadlineTap: () => context.pushNamed(
-                            Routes.globalArticleDetailsName,
-                            pathParameters: {'id': similarHeadline.id},
-                            extra: similarHeadline,
-                          ),
+                          onHeadlineTap: () {
+                            context
+                                .read<InterstitialAdManager>()
+                                .onPotentialAdTrigger(context: context);
+                            context.pushNamed(
+                              Routes.globalArticleDetailsName,
+                              pathParameters: {'id': similarHeadline.id},
+                              extra: similarHeadline,
+                            );
+                          },
                         );
                       case HeadlineImageStyle.smallThumbnail:
                         tile = HeadlineTileImageStart(
                           headline: similarHeadline,
-                          onHeadlineTap: () => context.pushNamed(
-                            Routes.globalArticleDetailsName,
-                            pathParameters: {'id': similarHeadline.id},
-                            extra: similarHeadline,
-                          ),
+                          onHeadlineTap: () {
+                            context
+                                .read<InterstitialAdManager>()
+                                .onPotentialAdTrigger(context: context);
+                            context.pushNamed(
+                              Routes.globalArticleDetailsName,
+                              pathParameters: {'id': similarHeadline.id},
+                              extra: similarHeadline,
+                            );
+                          },
                         );
                       case HeadlineImageStyle.largeThumbnail:
                         tile = HeadlineTileImageTop(
                           headline: similarHeadline,
-                          onHeadlineTap: () => context.pushNamed(
-                            Routes.globalArticleDetailsName,
-                            pathParameters: {'id': similarHeadline.id},
-                            extra: similarHeadline,
-                          ),
+                          onHeadlineTap: () {
+                            context
+                                .read<InterstitialAdManager>()
+                                .onPotentialAdTrigger(context: context);
+                            context.pushNamed(
+                              Routes.globalArticleDetailsName,
+                              pathParameters: {'id': similarHeadline.id},
+                              extra: similarHeadline,
+                            );
+                          },
                         );
                     }
                     return tile;