added guardian login with views for their assigned childs

lib/api/marianumconnect/auth/session_validator.dart

@@ -1,35 +1,38 @@
 import 'dart:developer';
 
-import '../../../model/account_data.dart';
+import '../../../session/session.dart';
+import '../../../session/session_lifecycle.dart';
+import '../../../session/session_manager.dart';
 import '../../errors/auth_exception.dart';
-import '../queries/auth_logout/auth_logout.dart';
+import '../queries/auth_me/auth_me.dart';
 import '../queries/auth_verify/auth_verify.dart';
-import 'token_storage.dart';
 
-/// Background credential probe — a server-side password rotation forces a
-/// re-login on the next cold start even when the bearer token would still
-/// be accepted.
+/// Credential probe. For password accounts a server-side password rotation
+/// forces a re-login on the next cold start even when the bearer token would
+/// still be accepted; for guardians it confirms a rejected token before the
+/// session is dropped.
 class SessionValidator {
   static Future<void> probeStored({
     required Future<void> Function() onInvalidated,
   }) async {
-    if (!AccountData().isPopulated()) return;
-    // AuthVerify uses its own dio (bypassing the demo interceptor), so a demo
-    // session must be skipped here or its missing token would 401 into a logout.
-    if (AccountData().isDemo) return;
-    final username = AccountData().getUsername();
-    final password = AccountData().getPassword();
+    final session = SessionManager().current;
+    // The probes use their own dio (bypassing the demo interceptor), so a demo
+    // session must be skipped or its missing token would 401 into a logout.
+    if (session == null || session.isDemo) return;
     try {
-      await AuthVerify().run(username: username, password: password);
+      switch (session) {
+        case CredentialSession(:final username, :final password):
+          await AuthVerify().run(username: username, password: password);
+        case GuardianSession():
+          await AuthMe().run();
+      }
     } on AuthException catch (e) {
       if (e.statusCode != 401) return;
-      log('MC: stored credentials rejected — forcing re-login');
-      await AuthLogout().run();
-      await const MarianumConnectTokenStorage().clear();
-      await AccountData().removeData();
+      log('MC: stored session rejected — forcing re-login');
+      await SessionLifecycle.signOut();
       await onInvalidated();
     } catch (e) {
-      log('MC: background credential check failed (transient): $e');
+      log('MC: background session check failed (transient): $e');
     }
   }
 }