feat: Implement session management with SessionListener and SessionHandlerMixin

apps/mobile/packages/core/lib/src/routing/client/navigator.dart

@@ -21,20 +21,27 @@ import 'route_paths.dart';
 ///
 /// See also:
 ///  * [ClientPaths] for route path constants
-///  * [StaffNavigator] for Staff app navigation
+///  * [ClientNavigator] for Client app navigation
 extension ClientNavigator on IModularNavigator {
   // ==========================================================================
   // AUTHENTICATION FLOWS
   // ==========================================================================
 
   /// Navigate to the root authentication screen.
-  /// 
+  ///
   /// This effectively logs out the user by navigating to root.
   /// Used when signing out or session expires.
   void toClientRoot() {
     navigate(ClientPaths.root);
   }
 
+  /// Navigates to the get started page.
+  ///
+  /// This is the landing page for unauthenticated users, offering login/signup options.
+  void toClientGetStartedPage() {
+    navigate(ClientPaths.getStarted);
+  }
+
   /// Navigates to the client sign-in page.
   ///
   /// This page allows existing clients to log in using email/password

apps/mobile/packages/core/lib/src/routing/staff/navigator.dart

@@ -36,6 +36,13 @@ extension StaffNavigator on IModularNavigator {
     navigate(StaffPaths.root);
   }
 
+  /// Navigates to the get started page.
+  /// 
+  /// This is the landing page for unauthenticated users, offering login/signup options.
+  void toGetStartedPage() {
+    navigate(StaffPaths.getStarted);
+  }
+
   /// Navigates to the phone verification page.
   ///
   /// Used for both login and signup flows to verify phone numbers via OTP.