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/features/navigation/widgets/chats_drawer.dart

@@ -149,8 +149,8 @@ class _ChatsDrawerState extends ConsumerState<ChatsDrawer> {
         children: [
           Padding(
             padding: const EdgeInsets.fromLTRB(
-              Spacing.md,
-              0,
+              Spacing.inputPadding,
+              Spacing.sm,
               Spacing.md,
               Spacing.sm,
             ),