fix(account): use pushNamed instead of goNamed for navigation

- Replace goNamed with pushNamed in followed contents pages
- Update navigation method in appearance settings page
- This change allows users to navigate back to the previous page when pressing the back button

Author: fulleni

lib/account/view/followed_contents/countries/followed_countries_list_page.dart

@@ -27,7 +27,7 @@ class FollowedCountriesListPage extends StatelessWidget {
             icon: const Icon(Icons.add_circle_outline),
             tooltip: l10n.addCountriesTooltip,
             onPressed: () {
-              context.goNamed(Routes.addCountryToFollowName);
+              context.pushNamed(Routes.addCountryToFollowName);
             },
           ),
         ],

lib/account/view/followed_contents/sources/followed_sources_list_page.dart

@@ -27,7 +27,7 @@ class FollowedSourcesListPage extends StatelessWidget {
             icon: const Icon(Icons.add_circle_outline),
             tooltip: l10n.addSourcesTooltip,
             onPressed: () {
-              context.goNamed(Routes.addSourceToFollowName);
+              context.pushNamed(Routes.addSourceToFollowName);
             },
           ),
         ],

lib/account/view/followed_contents/topics/followed_topics_list_page.dart

@@ -27,7 +27,7 @@ class FollowedTopicsListPage extends StatelessWidget {
             icon: const Icon(Icons.add_circle_outline),
             tooltip: l10n.addTopicsTooltip,
             onPressed: () {
-              context.goNamed(Routes.addTopicToFollowName);
+              context.pushNamed(Routes.addTopicToFollowName);
             },
           ),
         ],

lib/settings/view/appearance_settings_page.dart

@@ -37,7 +37,7 @@ class AppearanceSettingsPage extends StatelessWidget {
             title: Text(l10n.settingsAppearanceThemeSubPageTitle),
             trailing: const Icon(Icons.chevron_right),
             onTap: () {
-              context.goNamed(Routes.settingsAppearanceThemeName);
+              context.pushNamed(Routes.settingsAppearanceThemeName);
             },
           ),
           const Divider(indent: AppSpacing.lg, endIndent: AppSpacing.lg),
@@ -46,7 +46,7 @@ class AppearanceSettingsPage extends StatelessWidget {
             title: Text(l10n.settingsAppearanceFontSubPageTitle),
             trailing: const Icon(Icons.chevron_right),
             onTap: () {
-              context.goNamed(Routes.settingsAppearanceFontName);
+              context.pushNamed(Routes.settingsAppearanceFontName);
             },
           ),
         ],