added support for multiple accounts, guardian login bugfixes, ui changes

lib/state/app/modules/timetable/primary/primary_timetable_scope.dart

@@ -64,7 +64,10 @@ class _PrimaryTimetableScopeState extends State<PrimaryTimetableScope> {
   Widget build(BuildContext context) => MultiBlocListener(
     listeners: [
       BlocListener<AccountBloc, AccountState>(
-        listenWhen: (a, b) => a.status != b.status,
+        // While another account is being added, the session may already
+        // belong to it; this scope is replaced once that account takes over.
+        listenWhen: (a, b) =>
+            a.status != b.status && b.status != AccountStatus.addingAccount,
         listener: (_, _) => _sync(),
       ),
       BlocListener<CapabilitiesCubit, CapabilitiesState>(
@@ -73,9 +76,6 @@ class _PrimaryTimetableScopeState extends State<PrimaryTimetableScope> {
       ),
       BlocListener<ChildSelectionCubit, String?>(listener: (_, _) => _sync()),
     ],
-    child: BlocProvider<TimetableBloc>.value(
-      value: _bloc,
-      child: widget.child,
-    ),
+    child: BlocProvider<TimetableBloc>.value(value: _bloc, child: widget.child),
   );
 }