fix(headlines-feed): dispatch initial fetch event in _HeadlinesFeedPageState

- Move initial fetch event dispatch from router's BlocProvider to _HeadlinesFeedPageState::initState
- Use WidgetsBinding.instance.addPostFrameCallback to ensure BuildContext is fully initialized
- Prevent "Tried to listen to an InheritedWidget in a life-cycle that will never be called again" error

Author: fulleni

lib/headlines-feed/view/headlines_feed_page.dart

@@ -43,6 +43,23 @@ class _HeadlinesFeedPageState extends State<HeadlinesFeedPage> {
     super.initState();
     // Add listener to trigger pagination when scrolling near the bottom.
     _scrollController.addListener(_onScroll);
+
+    // Dispatch the initial fetch event for the headlines feed.
+    // This is intentionally placed in `initState` and wrapped in `addPostFrameCallback`
+    // to ensure the `BuildContext` is fully initialized and stable.
+    // This prevents the "Tried to listen to an InheritedWidget in a life-cycle
+    // that will never be called again" error, which occurred when the event
+    // was dispatched from the router's `BlocProvider` `create` method,
+    // as that context could be disposed before asynchronous operations completed.
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      if (mounted) {
+        context.read<HeadlinesFeedBloc>().add(
+              HeadlinesFeedFetchRequested(
+                adThemeStyle: AdThemeStyle.fromTheme(Theme.of(context)),
+              ),
+            );
+      }
+    });
   }
 
   @override