lint: fix

Author: fulleni

lib/app/view/app.dart

@@ -12,8 +12,7 @@ import 'package:ht_dashboard/app_configuration/bloc/app_configuration_bloc.dart'
 import 'package:ht_dashboard/authentication/bloc/authentication_bloc.dart';
 import 'package:ht_dashboard/l10n/app_localizations.dart';
 import 'package:ht_dashboard/router/router.dart';
-import 'package:ht_dashboard/shared/theme/app_theme.dart'
-    as app_theme_extension; // Import for app_theme.dart
+// Import for app_theme.dart
 import 'package:ht_dashboard/shared/theme/app_theme.dart';
 import 'package:ht_data_repository/ht_data_repository.dart';
 import 'package:ht_kv_storage_service/ht_kv_storage_service.dart';

lib/app_configuration/view/app_configuration_page.dart

@@ -43,7 +43,7 @@ class _AppConfigurationPageState extends State<AppConfigurationPage> {
           style: Theme.of(context).textTheme.headlineSmall,
         ),
         bottom: PreferredSize(
-          preferredSize: Size.fromHeight(kToolbarHeight + AppSpacing.lg),
+          preferredSize: const Size.fromHeight(kToolbarHeight + AppSpacing.lg),
           child: Padding(
             padding: const EdgeInsets.only(
               left: AppSpacing.lg,

lib/content_management/view/content_management_page.dart

@@ -4,7 +4,6 @@ import 'package:ht_dashboard/content_management/view/headlines_page.dart';
 import 'package:ht_dashboard/content_management/view/sources_page.dart';
 import 'package:ht_dashboard/l10n/l10n.dart';
 import 'package:ht_dashboard/shared/constants/app_spacing.dart';
-import 'package:ht_dashboard/shared/theme/app_theme.dart';
 
 /// {@template content_management_page}
 /// A page for Content Management with tabbed navigation for sub-sections.
@@ -40,7 +39,7 @@ class _ContentManagementPageState extends State<ContentManagementPage>
       appBar: AppBar(
         title: Text(l10n.contentManagement),
         bottom: PreferredSize(
-          preferredSize: Size.fromHeight(kTextTabBarHeight + AppSpacing.lg),
+          preferredSize: const Size.fromHeight(kTextTabBarHeight + AppSpacing.lg),
           child: Column(
             crossAxisAlignment: CrossAxisAlignment.start,
             children: [

lib/settings/view/settings_page.dart

@@ -38,7 +38,7 @@ class _SettingsView extends StatelessWidget {
       appBar: AppBar(
         title: Text(l10n.settings),
         bottom: PreferredSize(
-          preferredSize: Size.fromHeight(kToolbarHeight + AppSpacing.lg),
+          preferredSize: const Size.fromHeight(kToolbarHeight + AppSpacing.lg),
           child: Padding(
             padding: const EdgeInsets.only(
               left: AppSpacing.lg,