feat(account): add saved headlines page

- Created basic page layout
- Added AppBar with title
- Displaying placeholder text

Author: fulleni

lib/account/view/saved_headlines_page.dart

@@ -0,0 +1,19 @@
+import 'package:flutter/material.dart';
+import 'package:ht_main/l10n/l10n.dart';
+
+/// {@template saved_headlines_page}
+/// A placeholder page for displaying user's saved headlines.
+/// {@endtemplate}
+class SavedHeadlinesPage extends StatelessWidget {
+  /// {@macro saved_headlines_page}
+  const SavedHeadlinesPage({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    final l10n = context.l10n;
+    return Scaffold(
+      appBar: AppBar(title: Text(l10n.accountSavedHeadlinesTile)),
+      body: const Center(child: Text('SAVED HEADLINES PAGE (Placeholder)')),
+    );
+  }
+}