feat: enhance routing and connectivity handling

- Added a new route for connection issues, allowing users to navigate to a dedicated page when the server is unreachable.
- Updated the RouterNotifier to manage navigation based on server connectivity status and authentication state.
- Improved the handling of offline scenarios by integrating connectivity checks into the routing logic.
- Enhanced localization support for connection issue messages in multiple languages.
- Refactored the OfflineIndicator widget to streamline the display of connectivity status without unnecessary complexity.

lib/l10n/app_localizations_en.dart

@@ -33,6 +33,17 @@ class AppLocalizationsEn extends AppLocalizations {
   String get pleaseCheckConnection =>
       'Please check your connection and try again';
 
+  @override
+  String get connectionIssueTitle => 'Can\'t reach your server';
+
+  @override
+  String get connectionIssueSubtitle =>
+      'Reconnect to continue or sign out to choose a different server.';
+
+  @override
+  String get stillOfflineMessage =>
+      'We still can\'t reach the server. Double-check your connection and try again.';
+
   @override
   String get account => 'Account';
 
@@ -430,9 +441,6 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get emptyImageData => 'Empty image data';
 
-  @override
-  String get offlineBanner => 'You\'re offline. Some features may be limited.';
-
   @override
   String get featureRequiresInternet =>
       'This feature requires an internet connection';