added guardian login with views for their assigned childs

lib/push/push_actions.dart

@@ -8,8 +8,8 @@ import 'package:flutter_local_notifications/flutter_local_notifications.dart';
 import 'package:http/http.dart' as http;
 
 import '../api/marianumcloud/nextcloud_ocs.dart';
-import '../model/account_data.dart';
 import '../notification/notification_service.dart';
+import '../session/session_manager.dart';
 import 'chat_thread_store.dart';
 import 'nid_store.dart';
 import 'push_renderer.dart';
@@ -38,7 +38,7 @@ void _plog(String message) {
 /// Handles Talk notification actions (inline reply, mark-as-read). Runs in the
 /// background isolate spawned by flutter_local_notifications, so it may not
 /// share any app state — it reads credentials straight from secure storage via
-/// the [AccountData] singleton after awaiting population.
+/// the [SessionManager] singleton after awaiting the stored session.
 ///
 /// The class-level `vm:entry-point` pragma is REQUIRED in addition to the one
 /// on [handleBackgroundResponse]: the callback is resolved via
@@ -56,7 +56,7 @@ class PushActions {
   ) async {
     // The FLN action isolate starts WITHOUT main(): unlike the FCM background
     // isolate, plugins are not registered automatically there. Without this,
-    // AccountData's secure-storage/prefs reads throw or never complete → no
+    // The session's secure-storage/prefs reads throw or never complete → no
     // auth header, the Talk POST never happens and the RemoteInput spinner
     // runs forever.
     DartPluginRegistrant.ensureInitialized();
@@ -125,7 +125,8 @@ class PushActions {
   /// any) followed by the technical reason.
   static String actionFailureBody({String? lostText, required String detail}) {
     return [
-      if (lostText != null && lostText.isNotEmpty) 'Deine Nachricht: „$lostText“',
+      if (lostText != null && lostText.isNotEmpty)
+        'Deine Nachricht: „$lostText“',
       'Grund: $detail',
     ].join('\n');
   }
@@ -188,7 +189,10 @@ class PushActions {
   static Future<({bool ok, String detail})> sendReply(
     String chatToken,
     String message,
-  ) => _ocsPost('apps/spreed/api/v1/chat/$chatToken', body: {'message': message});
+  ) => _ocsPost(
+    'apps/spreed/api/v1/chat/$chatToken',
+    body: {'message': message},
+  );
 
   static Future<({bool ok, String detail})> markRead(String chatToken) =>
       _ocsPost('apps/spreed/api/v1/chat/$chatToken/read');
@@ -200,10 +204,10 @@ class PushActions {
     try {
       // Bounded: a hanging population (e.g. keystore issue) must fail the
       // action instead of leaving the notification spinner running forever.
-      final populated = await AccountData().waitForPopulation().timeout(
+      final session = await SessionManager().waitForLoad().timeout(
         const Duration(seconds: 10),
       );
-      if (!populated) {
+      if (session?.nextcloud == null) {
         _plog('Push action $path aborted: credentials unreadable in isolate');
         return (
           ok: false,