fixed guardian login edge cases and misleading placeholders on failed loads

lib/api/marianumconnect/auth/session_validator.dart

@@ -29,7 +29,15 @@ class SessionValidator {
     } on AuthException catch (e) {
       if (e.statusCode != 401) return;
       log('MC: stored session rejected — forcing re-login');
-      await SessionLifecycle.signOut();
+      await SessionLifecycle.signOut(
+        notice: switch (session) {
+          CredentialSession() =>
+            'Deine Zugangsdaten wurden vom Server abgelehnt. Vermutlich '
+                'wurde dein Passwort geändert. Bitte melde dich erneut an.',
+          GuardianSession() =>
+            'Deine Anmeldung ist abgelaufen. Bitte melde dich erneut an.',
+        },
+      );
       await onInvalidated();
     } catch (e) {
       log('MC: background session check failed (transient): $e');

lib/api/marianumconnect/queries/absence/absence_prefill.dart

@@ -1,3 +1,4 @@
+import '../../../errors/app_exception.dart';
 import '../../marianumconnect_query.dart';
 import 'absence_prefill_response.dart';
 
@@ -13,3 +14,17 @@ class AbsencePrefill extends MarianumConnectQuery {
     queryParameters: {'childId': ?childId},
   );
 }
+
+/// The prefill of a guardian's report is missing a field the form cannot ask
+/// for: name and class come from the child and are not editable there, so an
+/// incomplete prefill would leave a locked, unsubmittable form behind.
+class AbsencePrefillIncompleteException extends AppException {
+  const AbsencePrefillIncompleteException({super.technicalDetails})
+    : super(
+        userMessage:
+            'Für dieses Kind sind in der Schulverwaltung noch nicht alle '
+            'Angaben hinterlegt, die für eine Abwesenheitsmeldung nötig sind. '
+            'Bitte wende dich an das Sekretariat.',
+        allowRetry: false,
+      );
+}

lib/api/marianumconnect/queries/auth_guardian/auth_guardian_request.dart

@@ -30,8 +30,10 @@ class AuthGuardianRequestResponse {
 }
 
 /// Starts a passwordless guardian login: the server mails a code and a link.
-/// The answer is identical for unknown addresses, so it reveals nothing about
-/// which e-mails are registered.
+/// An unknown address is reported as such (`email_not_registered`) instead of
+/// being answered like a known one — a deliberate trade: without it guardians
+/// wait for a mail that never arrives. Registered addresses are therefore
+/// enumerable; keep that in mind when changing the server contract.
 class AuthGuardianRequest extends MarianumConnectQuery {
   AuthGuardianRequest({Dio? dio})
     : super(dio: dio ?? MarianumConnectApi.plainDio());
@@ -52,7 +54,7 @@ class AuthGuardianRequest extends MarianumConnectQuery {
       );
       return AuthGuardianRequestResponse.fromJson(response.data!);
     } on DioException catch (e) {
-      throw GuardianLoginException.fromDio(e);
+      throw GuardianLoginException.fromDio(e, verifying: false);
     }
   }
 }

lib/api/marianumconnect/queries/auth_guardian/guardian_login_exception.dart

@@ -31,14 +31,17 @@ class GuardianLoginException extends AppException {
   /// Maps a failed guardian auth call. Only 4xx answers that carry a guardian
   /// login reason become [GuardianLoginException]; everything else keeps the
   /// generic MarianumConnect mapping (network, 5xx, …).
-  static AppException fromDio(DioException e) {
+  ///
+  /// [verifying] false marks the e-mail step, where no code exists yet: a bare
+  /// 401 (reverse proxy, gateway) must not be reported as a wrong code there.
+  static AppException fromDio(DioException e, {bool verifying = true}) {
     final response = e.response;
     final status = response?.statusCode;
     if (status == null || status < 400 || status >= 500) {
       return mapMarianumConnectError(e);
     }
     final (code, attemptsLeft) = _parseBody(response!.data);
-    final error = _errorFor(code, status);
+    final error = _errorFor(code, status, verifying: verifying);
     if (error == null) return mapMarianumConnectError(e);
     return GuardianLoginException(
       error,
@@ -89,8 +92,11 @@ class GuardianLoginException extends AppException {
     return (marianumConnectErrorCode(data), attempts is int ? attempts : null);
   }
 
-  static GuardianLoginError? _errorFor(String? code, int status) =>
-      switch (code) {
+  static GuardianLoginError? _errorFor(
+    String? code,
+    int status, {
+    required bool verifying,
+  }) => switch (code) {
         'invalid_request' => GuardianLoginError.invalidRequest,
         'email_not_registered' => GuardianLoginError.emailNotRegistered,
         'account_disabled' => GuardianLoginError.accountDisabled,
@@ -100,7 +106,7 @@ class GuardianLoginException extends AppException {
         'request_expired' => GuardianLoginError.requestExpired,
         'too_many_attempts' => GuardianLoginError.tooManyAttempts,
         _ => switch (status) {
-          401 => GuardianLoginError.invalidCode,
+          401 when verifying => GuardianLoginError.invalidCode,
           // The server names an unknown address explicitly
           // (`email_not_registered`); a bare 404/405 means the endpoint itself
           // is missing, i.e. a server version without guardian login.

lib/main.dart

@@ -573,14 +573,14 @@ Future<void> _wipeUserState({
     // The timetable bloc is not reset here: PrimaryTimetableScope replaces it
     // on the status change, and HydratedBloc.storage.clear() below drops the
     // cached plans of every subject.
+    childSelectionCubit.reset();
+    capabilitiesCubit.reset();
+    nextcloudCapabilitiesCubit.reset();
     await Future.wait([
-      childSelectionCubit.reset(),
       chatListBloc.reset(),
       parentLettersBloc.reset(),
       chatBloc.reset(),
       breakerBloc.reset(),
-      capabilitiesCubit.reset(),
-      nextcloudCapabilitiesCubit.reset(),
     ]);
     final prefs = await SharedPreferences.getInstance();
     await prefs.clear();

lib/push/notification_permission_prompt.dart

@@ -141,6 +141,10 @@ Future<void> _maybePrompt(
     if (prompt.spentOnDisplay) {
       prompt.markShown(settings.val(write: true).notificationSettings);
     }
+    // The OS prompt (and its "declined" follow-up) outlive this dialog, so
+    // hold on to them: releasing the guard at the dialog's close would let a
+    // second occasion stack another dialog over the pending OS prompt.
+    Future<void>? permissionRequest;
     await showDialog<void>(
       context: context,
       builder: ConfirmDialog(
@@ -150,9 +154,10 @@ Future<void> _maybePrompt(
         confirmButton: 'Weiter',
         cancelButton: null,
         onConfirm: () =>
-            unawaited(_requestPermission(context, settings, prompt)),
+            permissionRequest = _requestPermission(context, settings, prompt),
       ).build,
     );
+    await permissionRequest;
   } finally {
     _promptInFlight = false;
   }

lib/session/session_lifecycle.dart

@@ -1,16 +1,24 @@
 import 'dart:developer';
 
+import 'package:flutter/foundation.dart';
+
 import '../api/marianumconnect/queries/auth_logout/auth_logout.dart';
 import '../auth_link/guardian_link_listener.dart';
 import '../push/push_registration.dart';
 import 'session_manager.dart';
 
 abstract final class SessionLifecycle {
+  /// Why the last sign-out happened, when the user did not ask for it. The
+  /// login screen shows it once and clears it — without it an expired session
+  /// just drops the user on the login screen with no explanation.
+  static final ValueNotifier<String?> signOutNotice = ValueNotifier(null);
+
   /// Ordered teardown: unregister push and revoke the Nextcloud app passwords
   /// (while those credentials still exist), then revoke the MC bearer token,
   /// finally wipe the local session. Each step is best-effort so an offline
   /// sign-out still reaches a clean local state.
-  static Future<void> signOut() async {
+  static Future<void> signOut({String? notice}) async {
+    signOutNotice.value = notice;
     try {
       await PushRegistration().logoutCleanup();
     } on Object catch (e) {

lib/state/app/modules/capabilities/bloc/capabilities_cubit.dart

@@ -25,8 +25,9 @@ class CapabilitiesCubit extends HydratedCubit<CapabilitiesState> {
 
   /// Refreshes capabilities from the server. On any failure (endpoint not yet
   /// live, network error, 4xx) the previously hydrated flags are kept but the
-  /// state is marked `loaded` — a failed fetch never silently grants a
-  /// capability, and an offline launch keeps whatever was cached.
+  /// state is marked `loaded` and `loadFailed` — a failed fetch never silently
+  /// grants a capability, an offline launch keeps whatever was cached, and the
+  /// UI can offer a retry instead of claiming a guardian has no children.
   Future<void> load() async {
     if (DemoMode.active) {
       emit(
@@ -51,11 +52,11 @@ class CapabilitiesCubit extends HydratedCubit<CapabilitiesState> {
       );
     } catch (e) {
       log('Failed to load capabilities: $e');
-      emit(state.copyWith(loaded: true));
+      emit(state.copyWith(loaded: true, loadFailed: true));
     }
   }
 
-  Future<void> reset() async => emit(const CapabilitiesState());
+  void reset() => emit(const CapabilitiesState());
 
   @override
   CapabilitiesState fromJson(Map<String, dynamic> json) {

lib/state/app/modules/capabilities/bloc/capabilities_state.dart

@@ -25,6 +25,12 @@ abstract class CapabilitiesState with _$CapabilitiesState {
     // observed at least once this session. Lets the UI distinguish "still
     // unknown" from "confirmed not allowed".
     @Default(false) bool loaded,
+    // True while the last attempt failed. Not persisted: a stale failure from
+    // the previous run must not colour a fresh start. Together with [loaded]
+    // it separates "confirmed no children" from "could not ask".
+    @JsonKey(includeToJson: false, includeFromJson: false)
+    @Default(false)
+    bool loadFailed,
   }) = _CapabilitiesState;
 
   factory CapabilitiesState.fromJson(Map<String, Object?> json) =>

lib/state/app/modules/capabilities/bloc/capabilities_state.freezed.dart

@@ -16,7 +16,7 @@ T _$identity<T>(T value) => value;
 /// @nodoc
 mixin _$CapabilitiesState {
 
- bool get viewForeignTimetables; bool get pushNotifications; int? get timetablePastDays; int? get timetableFutureDays; String? get userType; List<GuardianChild> get children; bool get loaded;
+ bool get viewForeignTimetables; bool get pushNotifications; int? get timetablePastDays; int? get timetableFutureDays; String? get userType; List<GuardianChild> get children; bool get loaded;@JsonKey(includeToJson: false, includeFromJson: false) bool get loadFailed;
 /// Create a copy of CapabilitiesState
 /// with the given fields replaced by the non-null parameter values.
 @JsonKey(includeFromJson: false, includeToJson: false)
@@ -30,20 +30,20 @@ $CapabilitiesStateCopyWith<CapabilitiesState> get copyWith => _$CapabilitiesStat
 @override
 bool operator ==(Object other) {
   final _this = this as CapabilitiesState;
-  return identical(this, other) || (other.runtimeType == runtimeType&&other is CapabilitiesState&&(identical(other.viewForeignTimetables, _this.viewForeignTimetables) || other.viewForeignTimetables == _this.viewForeignTimetables)&&(identical(other.pushNotifications, _this.pushNotifications) || other.pushNotifications == _this.pushNotifications)&&(identical(other.timetablePastDays, _this.timetablePastDays) || other.timetablePastDays == _this.timetablePastDays)&&(identical(other.timetableFutureDays, _this.timetableFutureDays) || other.timetableFutureDays == _this.timetableFutureDays)&&(identical(other.userType, _this.userType) || other.userType == _this.userType)&&const DeepCollectionEquality().equals(other.children, _this.children)&&(identical(other.loaded, _this.loaded) || other.loaded == _this.loaded));
+  return identical(this, other) || (other.runtimeType == runtimeType&&other is CapabilitiesState&&(identical(other.viewForeignTimetables, _this.viewForeignTimetables) || other.viewForeignTimetables == _this.viewForeignTimetables)&&(identical(other.pushNotifications, _this.pushNotifications) || other.pushNotifications == _this.pushNotifications)&&(identical(other.timetablePastDays, _this.timetablePastDays) || other.timetablePastDays == _this.timetablePastDays)&&(identical(other.timetableFutureDays, _this.timetableFutureDays) || other.timetableFutureDays == _this.timetableFutureDays)&&(identical(other.userType, _this.userType) || other.userType == _this.userType)&&const DeepCollectionEquality().equals(other.children, _this.children)&&(identical(other.loaded, _this.loaded) || other.loaded == _this.loaded)&&(identical(other.loadFailed, _this.loadFailed) || other.loadFailed == _this.loadFailed));
 }
 
 @JsonKey(includeFromJson: false, includeToJson: false)
 @override
 int get hashCode {
   final _this = this as CapabilitiesState;
-  return Object.hash(runtimeType,_this.viewForeignTimetables,_this.pushNotifications,_this.timetablePastDays,_this.timetableFutureDays,_this.userType,const DeepCollectionEquality().hash(_this.children),_this.loaded);
+  return Object.hash(runtimeType,_this.viewForeignTimetables,_this.pushNotifications,_this.timetablePastDays,_this.timetableFutureDays,_this.userType,const DeepCollectionEquality().hash(_this.children),_this.loaded,_this.loadFailed);
 }
 
 @override
 String toString() {
   final _this = this as CapabilitiesState;
-  return 'CapabilitiesState(viewForeignTimetables: ${_this.viewForeignTimetables}, pushNotifications: ${_this.pushNotifications}, timetablePastDays: ${_this.timetablePastDays}, timetableFutureDays: ${_this.timetableFutureDays}, userType: ${_this.userType}, children: ${_this.children}, loaded: ${_this.loaded})';
+  return 'CapabilitiesState(viewForeignTimetables: ${_this.viewForeignTimetables}, pushNotifications: ${_this.pushNotifications}, timetablePastDays: ${_this.timetablePastDays}, timetableFutureDays: ${_this.timetableFutureDays}, userType: ${_this.userType}, children: ${_this.children}, loaded: ${_this.loaded}, loadFailed: ${_this.loadFailed})';
 }
 
 
@@ -54,7 +54,7 @@ abstract mixin class $CapabilitiesStateCopyWith<$Res>  {
   factory $CapabilitiesStateCopyWith(CapabilitiesState value, $Res Function(CapabilitiesState) _then) = _$CapabilitiesStateCopyWithImpl;
 @useResult
 $Res call({
- bool viewForeignTimetables, bool pushNotifications, int? timetablePastDays, int? timetableFutureDays, String? userType, List<GuardianChild> children, bool loaded
+ bool viewForeignTimetables, bool pushNotifications, int? timetablePastDays, int? timetableFutureDays, String? userType, List<GuardianChild> children, bool loaded,@JsonKey(includeToJson: false, includeFromJson: false) bool loadFailed
 });
 
 
@@ -71,7 +71,7 @@ class _$CapabilitiesStateCopyWithImpl<$Res>
 
 /// Create a copy of CapabilitiesState
 /// with the given fields replaced by the non-null parameter values.
-@pragma('vm:prefer-inline') @override $Res call({Object? viewForeignTimetables = null,Object? pushNotifications = null,Object? timetablePastDays = freezed,Object? timetableFutureDays = freezed,Object? userType = freezed,Object? children = null,Object? loaded = null,}) {
+@pragma('vm:prefer-inline') @override $Res call({Object? viewForeignTimetables = null,Object? pushNotifications = null,Object? timetablePastDays = freezed,Object? timetableFutureDays = freezed,Object? userType = freezed,Object? children = null,Object? loaded = null,Object? loadFailed = null,}) {
   return _then(CapabilitiesState(
 viewForeignTimetables: null == viewForeignTimetables ? _self.viewForeignTimetables : viewForeignTimetables // ignore: cast_nullable_to_non_nullable
 as bool,pushNotifications: null == pushNotifications ? _self.pushNotifications : pushNotifications // ignore: cast_nullable_to_non_nullable
@@ -80,6 +80,7 @@ as int?,timetableFutureDays: freezed == timetableFutureDays ? _self.timetableFut
 as int?,userType: freezed == userType ? _self.userType : userType // ignore: cast_nullable_to_non_nullable
 as String?,children: null == children ? _self.children : children // ignore: cast_nullable_to_non_nullable
 as List<GuardianChild>,loaded: null == loaded ? _self.loaded : loaded // ignore: cast_nullable_to_non_nullable
+as bool,loadFailed: null == loadFailed ? _self.loadFailed : loadFailed // ignore: cast_nullable_to_non_nullable
 as bool,
   ));
 }
@@ -165,10 +166,10 @@ return $default(_that);case _:
 /// }
 /// ```
 
-@optionalTypeArgs TResult maybeWhen<TResult extends Object?>(TResult Function( bool viewForeignTimetables,  bool pushNotifications,  int? timetablePastDays,  int? timetableFutureDays,  String? userType,  List<GuardianChild> children,  bool loaded)?  $default,{required TResult orElse(),}) {final _that = this;
+@optionalTypeArgs TResult maybeWhen<TResult extends Object?>(TResult Function( bool viewForeignTimetables,  bool pushNotifications,  int? timetablePastDays,  int? timetableFutureDays,  String? userType,  List<GuardianChild> children,  bool loaded, @JsonKey(includeToJson: false, includeFromJson: false)  bool loadFailed)?  $default,{required TResult orElse(),}) {final _that = this;
 switch (_that) {
 case _CapabilitiesState() when $default != null:
-return $default(_that.viewForeignTimetables,_that.pushNotifications,_that.timetablePastDays,_that.timetableFutureDays,_that.userType,_that.children,_that.loaded);case _:
+return $default(_that.viewForeignTimetables,_that.pushNotifications,_that.timetablePastDays,_that.timetableFutureDays,_that.userType,_that.children,_that.loaded,_that.loadFailed);case _:
   return orElse();
 
 }
@@ -186,10 +187,10 @@ return $default(_that.viewForeignTimetables,_that.pushNotifications,_that.timeta
 /// }
 /// ```
 
-@optionalTypeArgs TResult when<TResult extends Object?>(TResult Function( bool viewForeignTimetables,  bool pushNotifications,  int? timetablePastDays,  int? timetableFutureDays,  String? userType,  List<GuardianChild> children,  bool loaded)  $default,) {final _that = this;
+@optionalTypeArgs TResult when<TResult extends Object?>(TResult Function( bool viewForeignTimetables,  bool pushNotifications,  int? timetablePastDays,  int? timetableFutureDays,  String? userType,  List<GuardianChild> children,  bool loaded, @JsonKey(includeToJson: false, includeFromJson: false)  bool loadFailed)  $default,) {final _that = this;
 switch (_that) {
 case _CapabilitiesState():
-return $default(_that.viewForeignTimetables,_that.pushNotifications,_that.timetablePastDays,_that.timetableFutureDays,_that.userType,_that.children,_that.loaded);case _:
+return $default(_that.viewForeignTimetables,_that.pushNotifications,_that.timetablePastDays,_that.timetableFutureDays,_that.userType,_that.children,_that.loaded,_that.loadFailed);case _:
   throw StateError('Unexpected subclass');
 
 }
@@ -206,10 +207,10 @@ return $default(_that.viewForeignTimetables,_that.pushNotifications,_that.timeta
 /// }
 /// ```
 
-@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? Function( bool viewForeignTimetables,  bool pushNotifications,  int? timetablePastDays,  int? timetableFutureDays,  String? userType,  List<GuardianChild> children,  bool loaded)?  $default,) {final _that = this;
+@optionalTypeArgs TResult? whenOrNull<TResult extends Object?>(TResult? Function( bool viewForeignTimetables,  bool pushNotifications,  int? timetablePastDays,  int? timetableFutureDays,  String? userType,  List<GuardianChild> children,  bool loaded, @JsonKey(includeToJson: false, includeFromJson: false)  bool loadFailed)?  $default,) {final _that = this;
 switch (_that) {
 case _CapabilitiesState() when $default != null:
-return $default(_that.viewForeignTimetables,_that.pushNotifications,_that.timetablePastDays,_that.timetableFutureDays,_that.userType,_that.children,_that.loaded);case _:
+return $default(_that.viewForeignTimetables,_that.pushNotifications,_that.timetablePastDays,_that.timetableFutureDays,_that.userType,_that.children,_that.loaded,_that.loadFailed);case _:
   return null;
 
 }
@@ -221,7 +222,7 @@ return $default(_that.viewForeignTimetables,_that.pushNotifications,_that.timeta
 @JsonSerializable()
 
 class _CapabilitiesState extends CapabilitiesState {
-  const _CapabilitiesState({this.viewForeignTimetables = false, this.pushNotifications = false, this.timetablePastDays, this.timetableFutureDays, this.userType,  List<GuardianChild> children = const <GuardianChild>[], this.loaded = false}): _children = children,super._();
+  const _CapabilitiesState({this.viewForeignTimetables = false, this.pushNotifications = false, this.timetablePastDays, this.timetableFutureDays, this.userType,  List<GuardianChild> children = const <GuardianChild>[], this.loaded = false, @JsonKey(includeToJson: false, includeFromJson: false) this.loadFailed = false}): _children = children,super._();
   factory _CapabilitiesState.fromJson(Map<String, dynamic> json) => _$CapabilitiesStateFromJson(json);
 
 @override@JsonKey() final  bool viewForeignTimetables;
@@ -237,6 +238,7 @@ class _CapabilitiesState extends CapabilitiesState {
 }
 
 @override@JsonKey() final  bool loaded;
+@override@JsonKey(includeToJson: false, includeFromJson: false) final  bool loadFailed;
 
 /// Create a copy of CapabilitiesState
 /// with the given fields replaced by the non-null parameter values.
@@ -251,18 +253,18 @@ Map<String, dynamic> toJson() {
 
 @override
 bool operator ==(Object other) {
-    return identical(this, other) || (other.runtimeType == runtimeType&&other is _CapabilitiesState&&(identical(other.viewForeignTimetables, viewForeignTimetables) || other.viewForeignTimetables == viewForeignTimetables)&&(identical(other.pushNotifications, pushNotifications) || other.pushNotifications == pushNotifications)&&(identical(other.timetablePastDays, timetablePastDays) || other.timetablePastDays == timetablePastDays)&&(identical(other.timetableFutureDays, timetableFutureDays) || other.timetableFutureDays == timetableFutureDays)&&(identical(other.userType, userType) || other.userType == userType)&&const DeepCollectionEquality().equals(other.children, _children)&&(identical(other.loaded, loaded) || other.loaded == loaded));
+    return identical(this, other) || (other.runtimeType == runtimeType&&other is _CapabilitiesState&&(identical(other.viewForeignTimetables, viewForeignTimetables) || other.viewForeignTimetables == viewForeignTimetables)&&(identical(other.pushNotifications, pushNotifications) || other.pushNotifications == pushNotifications)&&(identical(other.timetablePastDays, timetablePastDays) || other.timetablePastDays == timetablePastDays)&&(identical(other.timetableFutureDays, timetableFutureDays) || other.timetableFutureDays == timetableFutureDays)&&(identical(other.userType, userType) || other.userType == userType)&&const DeepCollectionEquality().equals(other.children, _children)&&(identical(other.loaded, loaded) || other.loaded == loaded)&&(identical(other.loadFailed, loadFailed) || other.loadFailed == loadFailed));
 }
 
 @JsonKey(includeFromJson: false, includeToJson: false)
 @override
 int get hashCode {
-    return Object.hash(runtimeType,viewForeignTimetables,pushNotifications,timetablePastDays,timetableFutureDays,userType,const DeepCollectionEquality().hash(_children),loaded);
+    return Object.hash(runtimeType,viewForeignTimetables,pushNotifications,timetablePastDays,timetableFutureDays,userType,const DeepCollectionEquality().hash(_children),loaded,loadFailed);
 }
 
 @override
 String toString() {
-    return 'CapabilitiesState(viewForeignTimetables: $viewForeignTimetables, pushNotifications: $pushNotifications, timetablePastDays: $timetablePastDays, timetableFutureDays: $timetableFutureDays, userType: $userType, children: $children, loaded: $loaded)';
+    return 'CapabilitiesState(viewForeignTimetables: $viewForeignTimetables, pushNotifications: $pushNotifications, timetablePastDays: $timetablePastDays, timetableFutureDays: $timetableFutureDays, userType: $userType, children: $children, loaded: $loaded, loadFailed: $loadFailed)';
 }
 
 
@@ -273,7 +275,7 @@ abstract mixin class _$CapabilitiesStateCopyWith<$Res> implements $CapabilitiesS
   factory _$CapabilitiesStateCopyWith(_CapabilitiesState value, $Res Function(_CapabilitiesState) _then) = __$CapabilitiesStateCopyWithImpl;
 @override @useResult
 $Res call({
- bool viewForeignTimetables, bool pushNotifications, int? timetablePastDays, int? timetableFutureDays, String? userType, List<GuardianChild> children, bool loaded
+ bool viewForeignTimetables, bool pushNotifications, int? timetablePastDays, int? timetableFutureDays, String? userType, List<GuardianChild> children, bool loaded,@JsonKey(includeToJson: false, includeFromJson: false) bool loadFailed
 });
 
 
@@ -290,7 +292,7 @@ class __$CapabilitiesStateCopyWithImpl<$Res>
 
 /// Create a copy of CapabilitiesState
 /// with the given fields replaced by the non-null parameter values.
-@override @pragma('vm:prefer-inline') $Res call({Object? viewForeignTimetables = null,Object? pushNotifications = null,Object? timetablePastDays = freezed,Object? timetableFutureDays = freezed,Object? userType = freezed,Object? children = null,Object? loaded = null,}) {
+@override @pragma('vm:prefer-inline') $Res call({Object? viewForeignTimetables = null,Object? pushNotifications = null,Object? timetablePastDays = freezed,Object? timetableFutureDays = freezed,Object? userType = freezed,Object? children = null,Object? loaded = null,Object? loadFailed = null,}) {
   return _then(_CapabilitiesState(
 viewForeignTimetables: null == viewForeignTimetables ? _self.viewForeignTimetables : viewForeignTimetables // ignore: cast_nullable_to_non_nullable
 as bool,pushNotifications: null == pushNotifications ? _self.pushNotifications : pushNotifications // ignore: cast_nullable_to_non_nullable
@@ -299,6 +301,7 @@ as int?,timetableFutureDays: freezed == timetableFutureDays ? _self.timetableFut
 as int?,userType: freezed == userType ? _self.userType : userType // ignore: cast_nullable_to_non_nullable
 as String?,children: null == children ? _self._children : children // ignore: cast_nullable_to_non_nullable
 as List<GuardianChild>,loaded: null == loaded ? _self.loaded : loaded // ignore: cast_nullable_to_non_nullable
+as bool,loadFailed: null == loadFailed ? _self.loadFailed : loadFailed // ignore: cast_nullable_to_non_nullable
 as bool,
   ));
 }

lib/state/app/modules/children/child_selection_cubit.dart

@@ -10,7 +10,7 @@ class ChildSelectionCubit extends HydratedCubit<String?> {
 
   void select(String childId) => emit(childId);
 
-  Future<void> reset() async => emit(null);
+  void reset() => emit(null);
 
   @override
   String? fromJson(Map<String, dynamic> json) => json['childId'] as String?;

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

@@ -92,7 +92,7 @@ class NextcloudCapabilitiesCubit
     }
   }
 
-  Future<void> reset() async => emit(const NextcloudCapabilitiesState());
+  void reset() => emit(const NextcloudCapabilitiesState());
 
   @override
   NextcloudCapabilitiesState fromJson(Map<String, dynamic> json) {

lib/view/login/guardian_login_controller.dart

@@ -54,9 +54,14 @@ class GuardianLoginController extends ChangeNotifier {
   String? get errorMessage => _errorMessage;
   String? get errorDetails => _errorDetails;
 
-  bool canResend() {
+  bool canResend() => resendCooldown() == Duration.zero;
+
+  /// Restzeit, bis [resend] wieder erlaubt ist.
+  Duration resendCooldown() {
     final pending = _pending;
-    return pending != null && !_now().isBefore(pending.resendAvailableAt);
+    if (pending == null) return Duration.zero;
+    final remaining = pending.resendAvailableAt.difference(_now());
+    return remaining.isNegative ? Duration.zero : remaining;
   }
 
   /// Picks up a request started before the app was closed.
@@ -77,8 +82,12 @@ class GuardianLoginController extends ChangeNotifier {
   Future<bool> requestCode(String email) async {
     final normalized = email.trim().toLowerCase();
     if (DemoMode.matchesGuardian(normalized)) {
-      await _signIn(GuardianSession(email: normalized, isDemo: true));
-      return true;
+      var signedIn = false;
+      await _run(() async {
+        await _signIn(GuardianSession(email: normalized, isDemo: true));
+        signedIn = true;
+      });
+      return signedIn;
     }
     await _run(() async {
       final secret = DeviceBinding.generateSecret();
@@ -128,6 +137,17 @@ class GuardianLoginController extends ChangeNotifier {
     return _complete(linkToken: link.linkToken);
   }
 
+  /// A mail link that does not belong to the server the app talks to (a live
+  /// link while the app points at beta). Without this the tap would do nothing
+  /// at all.
+  void rejectForeignLink() {
+    _errorMessage =
+        'Dieser Anmeldelink gehört zu einem anderen Server als dem, mit dem '
+        'die App gerade verbunden ist. Bitte gib den Code aus der E-Mail ein.';
+    _errorDetails = null;
+    notifyListeners();
+  }
+
   /// Abandons the running request, e.g. to correct a mistyped address.
   Future<void> changeEmail() async {
     await _store.clear();
@@ -140,7 +160,15 @@ class GuardianLoginController extends ChangeNotifier {
 
   Future<bool> _complete({String? code, String? linkToken}) async {
     final pending = _pending;
-    if (pending == null) return false;
+    if (pending == null) {
+      _errorMessage = GuardianLoginException.messageFor(
+        GuardianLoginError.requestExpired,
+      );
+      _errorDetails = null;
+      _step = GuardianLoginStep.enterEmail;
+      notifyListeners();
+      return false;
+    }
     var signedIn = false;
     await _run(() async {
       await _verify.run(
@@ -188,9 +216,16 @@ class GuardianLoginController extends ChangeNotifier {
   }
 
   static Future<void> _defaultSignIn(Session session) async {
-    // Drop any widget snapshot of a previous account before the new one loads.
-    await WidgetSync.clear();
-    await WidgetSync.triggerUpdate();
+    // Sign in first: the one-time code is already spent at this point, so a
+    // failing widget reset must not cost the session (the user would have to
+    // request a fresh mail for a login that actually succeeded).
     await SessionManager().signIn(session);
+    // Drop any widget snapshot of a previous account.
+    try {
+      await WidgetSync.clear();
+      await WidgetSync.triggerUpdate();
+    } on Object catch (e) {
+      log('Guardian login: widget reset failed: $e');
+    }
   }
 }

lib/view/login/login.dart

@@ -7,6 +7,7 @@ import '../../api/marianumconnect/marianumconnect_endpoint.dart' as mc;
 import '../../auth_link/guardian_link_listener.dart';
 import '../../auth_link/guardian_login_link.dart';
 import '../../background/widget_background_task.dart';
+import '../../session/session_lifecycle.dart';
 import '../../state/app/modules/account/bloc/account_bloc.dart';
 import '../../state/app/modules/account/bloc/account_state.dart';
 import '../../state/app/modules/settings/bloc/settings_cubit.dart';
@@ -14,6 +15,7 @@ import '../../storage/dev_tools_settings.dart';
 import '../../storage/settings.dart' as model;
 import '../../theming/light_app_theme.dart';
 import '../../utils/haptics.dart';
+import '../../widget/info_dialog.dart';
 import '../pages/settings/widgets/endpoint_picker.dart';
 import 'guardian_login_controller.dart';
 import 'login_controller.dart';
@@ -54,6 +56,16 @@ class _LoginState extends State<Login> with SingleTickerProviderStateMixin {
     });
     GuardianLinkListener.pending.addListener(_consumeGuardianLink);
     _consumeGuardianLink();
+    WidgetsBinding.instance.addPostFrameCallback((_) => _showSignOutNotice());
+  }
+
+  /// An involuntary sign-out (expired token, rotated password) otherwise just
+  /// drops the user here without a word.
+  void _showSignOutNotice() {
+    final notice = SessionLifecycle.signOutNotice.value;
+    if (notice == null || !mounted) return;
+    SessionLifecycle.signOutNotice.value = null;
+    InfoDialog.show(context, notice, title: 'Erneut anmelden');
   }
 
   /// A tapped mail link finishes the guardian login without typing the code.
@@ -65,10 +77,13 @@ class _LoginState extends State<Login> with SingleTickerProviderStateMixin {
       uri,
       apiBase: Uri.parse(mc.MarianumConnectEndpoint.current()),
     );
-    if (link == null) return;
     await _guardianRestored;
     if (!mounted) return;
     setState(() => _audience = LoginAudience.guardian);
+    if (link == null) {
+      _guardianController.rejectForeignLink();
+      return;
+    }
     final signedIn = await _guardianController.submitLink(link);
     if (signedIn && mounted) _onLoginSuccess();
   }

lib/view/login/widgets/guardian_login_card.dart

@@ -158,7 +158,7 @@ class _GuardianLoginCardState extends State<GuardianLoginCard> {
   Widget _buildCodeStep(BuildContext context) {
     final theme = Theme.of(context);
     final pending = _controller.pending!;
-    final remaining = pending.resendAvailableAt.difference(DateTime.now());
+    final remaining = _controller.resendCooldown();
     return Form(
       key: _codeFormKey,
       child: LoginCardFrame(

lib/view/login/widgets/login_audience_card.dart

@@ -14,7 +14,7 @@ class LoginAudienceCard extends StatelessWidget {
   @override
   Widget build(BuildContext context) => LoginCardFrame(
     title: 'Anmelden',
-    hint: 'Bite wähle deine Anmeldemethode',
+    hint: 'Bitte wähle deine Anmeldemethode',
     children: [
       _AudienceButton(
         key: const Key('login-audience-school'),

lib/view/pages/absence_report/absence_report_view.dart

@@ -106,6 +106,18 @@ class _AbsenceFormState extends State<_AbsenceForm> {
       // The child's identity is the whole point of the form, so a failed
       // prefill is an error here, not a degraded start.
       final prefill = await AbsencePrefill().run(childId: _childId);
+      // Name and class are readOnly in this mode, so a gap in the prefill
+      // cannot be filled by the user — say so instead of offering a form that
+      // can never be submitted.
+      if (prefill.firstName.trim().isEmpty ||
+          prefill.lastName.trim().isEmpty ||
+          prefill.className.trim().isEmpty) {
+        throw AbsencePrefillIncompleteException(
+          technicalDetails:
+              'childId=$_childId, class="${prefill.className}", '
+              'name="${prefill.firstName} ${prefill.lastName}"',
+        );
+      }
       _classes = [prefill.className];
       _applyPrefill(prefill, _classes);
       return;

lib/view/pages/parent_letters/parent_letter_form_policy.dart

@@ -25,10 +25,17 @@ class ParentLetterFormPolicy {
   final List<ParentLetterField> fields;
   final bool signatureRequired;
 
+  /// The letter asks for something this app version drops from [fields].
+  /// Only a required one blocks the form ([ParentLetterFormMode.unsupported]);
+  /// an optional one still has to be named, or the response looks complete
+  /// while a question went unanswered.
+  final bool hasUnsupportedFields;
+
   const ParentLetterFormPolicy._(
     this.mode,
     this.fields,
     this.signatureRequired,
+    this.hasUnsupportedFields,
   );
 
   bool get canSubmit =>
@@ -89,6 +96,11 @@ class ParentLetterFormPolicy {
           ? ParentLetterFormMode.change
           : ParentLetterFormMode.open;
     }
-    return ParentLetterFormPolicy._(mode, supported, request.signatureRequired);
+    return ParentLetterFormPolicy._(
+      mode,
+      supported,
+      request.signatureRequired,
+      supported.length != request.fields.length,
+    );
   }
 }

lib/view/pages/parent_letters/widgets/parent_letter_response_card.dart

@@ -101,10 +101,14 @@ class _ParentLetterResponseCardState extends State<ParentLetterResponseCard> {
               ParentLetterFormMode.open ||
               ParentLetterFormMode.change => _form(policy),
               ParentLetterFormMode.done => _result(theme, policy),
+              // The server locks a response for other reasons too (withdrawn,
+              // finalised), so only name the deadline when there is one.
               ParentLetterFormMode.closed => [
                 _note(
-                  'Die Frist ist abgelaufen. Eine Rückmeldung ist nicht mehr '
-                  'möglich.',
+                  deadline != null
+                      ? 'Die Frist ist abgelaufen. Eine Rückmeldung ist nicht '
+                            'mehr möglich.'
+                      : 'Eine Rückmeldung ist nicht mehr möglich.',
                 ),
               ],
               ParentLetterFormMode.unsupported => [
@@ -157,6 +161,15 @@ class _ParentLetterResponseCardState extends State<ParentLetterResponseCard> {
         ),
       ),
     ],
+    if (policy.hasUnsupportedFields)
+      Padding(
+        padding: const EdgeInsets.only(bottom: 8),
+        child: _note(
+          'Dieser Elternbrief enthält zusätzlich eine Abfrage, die diese '
+          'App-Version nicht anzeigen kann. Bitte aktualisiere die App, um '
+          'vollständig zu antworten.',
+        ),
+      ),
     Padding(
       padding: const EdgeInsets.fromLTRB(16, 4, 16, 0),
       child: AsyncActionButton(

lib/view/pages/timetable/timetable.dart

@@ -12,7 +12,6 @@ import '../../../state/app/modules/timetable/bloc/timetable_state.dart';
 import '../../../state/app/modules/timetable/policy/timetable_policy.dart';
 import '../../../state/app/modules/timetable/subject/timetable_subject.dart';
 import '../../../utils/haptics.dart';
-import '../../../widget/app_progress_indicator.dart';
 import '../../../widget/child_switcher.dart';
 import '../../../widget/demo_restricted.dart';
 import 'custom_events/custom_event_edit_dialog.dart';
@@ -29,6 +28,11 @@ class Timetable extends StatefulWidget {
 }
 
 class _TimetableState extends State<Timetable> {
+  /// One calendar key per subject: a new subject (child switch, foreign plan)
+  /// must not inherit the displayed week of the previous one, but coming back
+  /// to a subject should find its calendar where it was left.
+  final Map<TimetableSubject, GlobalKey<TimetableCalendarViewState>>
+  _calendarKeys = {};
   GlobalKey<TimetableCalendarViewState> _calendarKey =
       GlobalKey<TimetableCalendarViewState>();
   TimetableSubject? _calendarSubject;
@@ -107,7 +111,10 @@ class _TimetableState extends State<Timetable> {
     // previous calendar state.
     if (subject != _calendarSubject) {
       _calendarSubject = subject;
-      _calendarKey = GlobalKey<TimetableCalendarViewState>();
+      _calendarKey = _calendarKeys.putIfAbsent(
+        subject,
+        GlobalKey<TimetableCalendarViewState>.new,
+      );
     }
     final innerState = context.watch<B>().state.data;
     final atToday = innerState != null && _isOnInitialWeek(innerState);
@@ -204,20 +211,16 @@ class _TimetableState extends State<Timetable> {
 }
 
 /// Shown instead of a plan when the session has none, i.e. a guardian whose
-/// children are not known (yet).
+/// children are not known (yet). [NoChildrenPlaceholder] tells a pending or
+/// failed capability load apart from a confirmed empty list.
 class _NoTimetableView extends StatelessWidget {
   const _NoTimetableView();
 
   @override
-  Widget build(BuildContext context) {
-    final capabilities = context.watch<CapabilitiesCubit>().state;
-    return Scaffold(
-      appBar: AppBar(title: const Text('Stunden & Vertretungsplan')),
-      body: capabilities.loaded
-          ? const NoChildrenPlaceholder()
-          : const Center(child: AppProgressIndicator.large()),
-    );
-  }
+  Widget build(BuildContext context) => Scaffold(
+    appBar: AppBar(title: const Text('Stunden & Vertretungsplan')),
+    body: const NoChildrenPlaceholder(),
+  );
 }
 
 /// Slim banner shown at the top of the timetable while a foreign element's plan

lib/widget/child_switcher.dart

@@ -5,6 +5,8 @@ import '../api/marianumconnect/queries/get_capabilities/guardian_child.dart';
 import '../state/app/modules/capabilities/bloc/capabilities_cubit.dart';
 import '../state/app/modules/children/child_selection_cubit.dart';
 import '../utils/haptics.dart';
+import 'app_progress_indicator.dart';
+import 'async_action_button.dart';
 import 'centered_leading.dart';
 import 'details_bottom_sheet.dart';
 import 'placeholder_view.dart';
@@ -71,15 +73,37 @@ class ChildTile extends StatelessWidget {
   );
 }
 
-/// Shown by per-child modules while a guardian has no linked child.
+/// Shown by per-child modules while a guardian has no linked child. The
+/// children come from `me/capabilities`, so a failed or pending load must not
+/// be presented as "no child assigned" — that sends parents to the secretariat
+/// over a network error.
 class NoChildrenPlaceholder extends StatelessWidget {
   const NoChildrenPlaceholder({super.key});
 
   @override
-  Widget build(BuildContext context) => const PlaceholderView(
-    icon: Icons.family_restroom_outlined,
-    text:
-        'Deinem Konto ist noch kein Kind zugeordnet. Bitte wende dich an '
-        'das Sekretariat.',
-  );
+  Widget build(BuildContext context) {
+    final capabilities = context.watch<CapabilitiesCubit>().state;
+    if (!capabilities.loaded) {
+      return const Center(child: AppProgressIndicator.large());
+    }
+    if (capabilities.loadFailed) {
+      return PlaceholderView(
+        icon: Icons.cloud_off_outlined,
+        text:
+            'Die zugeordneten Kinder konnten nicht geladen werden. Bitte '
+            'prüfe deine Internetverbindung.',
+        button: AsyncActionButton(
+          icon: Icons.refresh,
+          onPressed: context.read<CapabilitiesCubit>().load,
+          child: const Text('Erneut versuchen'),
+        ),
+      );
+    }
+    return const PlaceholderView(
+      icon: Icons.family_restroom_outlined,
+      text:
+          'Deinem Konto ist noch kein Kind zugeordnet. Bitte wende dich an '
+          'das Sekretariat.',
+    );
+  }
 }