Enhance authentication flow and user role management

- Updated AuthViewModel to hydrate user data from storage on initialization.
- Added method to AuthRepository for retrieving stored customer data.
- Enhanced AuthService to save and retrieve customer data from SharedPreferences.
- Refactored UI components to use context.watch for user role updates in MeetingTimeDialog, TenderDetailActions, and TendersPage.
- Improved navigation logic in final completion pages to handle user interactions more effectively.

lib/view_models/auth_view_model.dart

@@ -46,6 +46,19 @@ class AuthViewModel with ChangeNotifier {
     notifyListeners();
   }
 
+  Future<void> hydrateFromStorage() async {
+    try {
+      final customer = await _authRepository.getStoredCustomer();
+      if (customer != null) {
+        _loggedInUser = customer;
+        _userRole = customer.role == 'admin' ? Role.admin : Role.analyst;
+        notifyListeners();
+      }
+    } catch (e) {
+      AppLogger().error('❌ Failed to hydrate auth state: $e');
+    }
+  }
+
   void _onTextChanged() {
     notifyListeners();
   }
@@ -97,11 +110,22 @@ class AuthViewModel with ChangeNotifier {
     if (result is Ok<bool>) {
       if (result.value) {
         _isLoggedIn = result.value;
+
+        // Restore customer data from SharedPreferences
+        final customer = await _authRepository.getStoredCustomer();
+        if (customer != null) {
+          _loggedInUser = customer;
+          _userRole = customer.role == 'admin' ? Role.admin : Role.analyst;
+        }
       } else {
         _isLoggedIn = false;
+        _loggedInUser = null;
+        _userRole = null;
       }
     } else {
       _isLoggedIn = false;
+      _loggedInUser = null;
+      _userRole = null;
     }
     notifyListeners();
   }
@@ -113,6 +137,7 @@ class AuthViewModel with ChangeNotifier {
     passwordController.clear();
     _isLoggedIn = false;
     _loggedInUser = null;
+    _userRole = null;
     notifyListeners();
   }