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_it.dart

@@ -32,6 +32,17 @@ class AppLocalizationsIt extends AppLocalizations {
   @override
   String get pleaseCheckConnection => 'Controlla la connessione e riprova';
 
+  @override
+  String get connectionIssueTitle => 'Impossibile raggiungere il server';
+
+  @override
+  String get connectionIssueSubtitle =>
+      'Riconnettiti per continuare oppure esci per scegliere un server diverso.';
+
+  @override
+  String get stillOfflineMessage =>
+      'Non riusciamo ancora a raggiungere il server. Controlla la connessione e riprova.';
+
   @override
   String get account => 'Account';
 
@@ -431,10 +442,6 @@ class AppLocalizationsIt extends AppLocalizations {
   @override
   String get emptyImageData => 'Dati immagine vuoti';
 
-  @override
-  String get offlineBanner =>
-      'Sei offline. Alcune funzioni potrebbero essere limitate.';
-
   @override
   String get featureRequiresInternet =>
       'Questa funzione richiede una connessione Internet';