replaced account data singleton with a session model

lib/state/app/modules/nextcloud_capabilities/bloc/nextcloud_capabilities_cubit.dart

@@ -5,7 +5,7 @@ import 'package:hydrated_bloc/hydrated_bloc.dart';
 import '../../../../../api/demo/data/demo_capabilities.dart';
 import '../../../../../api/demo/demo_mode.dart';
 import '../../../../../api/marianumcloud/capabilities/get_nextcloud_capabilities.dart';
-import '../../../../../model/account_data.dart';
+import '../../../../../session/session_manager.dart';
 import 'nextcloud_capabilities_state.dart';
 
 /// Holds the current user's Nextcloud `files_sharing` capabilities. Hydrated so
@@ -60,16 +60,17 @@ class NextcloudCapabilitiesCubit
   /// Refreshes capabilities from the server. On any failure the previously
   /// hydrated flags are kept but the state is marked `loaded`.
   Future<void> load() async {
+    if (!SessionManager().hasNextcloud) return;
     if (DemoMode.active) {
       emit(DemoNextcloudCapabilities.state());
       return;
     }
-    final epoch = AccountData().sessionEpoch;
+    final epoch = SessionManager().sessionEpoch;
     try {
       final caps = await GetNextcloudCapabilities().run();
       // A slow answer for the previous account must not decide the modules
       // of the next one.
-      if (!AccountData().isCurrentSession(epoch)) return;
+      if (!SessionManager().isCurrentSession(epoch)) return;
       emit(
         NextcloudCapabilitiesState(
           apiEnabled: caps.apiEnabled,