Add multi calendar support and protected web app

lib/dialogs.dart

@@ -166,6 +166,7 @@ class EventInput {
     required this.start,
     required this.date,
     required this.personId,
+    required this.appCalendarId,
     required this.note,
     required this.hasTodos,
     required this.todos,
@@ -175,6 +176,7 @@ class EventInput {
   final String start;
   final DateTime date;
   final String? personId;
+  final String? appCalendarId;
   final String note;
   final bool hasTodos;
   final List<String> todos;
@@ -184,11 +186,13 @@ class EventAddDialog extends StatefulWidget {
   const EventAddDialog({
     super.key,
     required this.people,
+    required this.appCalendars,
     this.event,
     this.todoSuggestions = const [],
   });
 
   final List<Person> people;
+  final List<AppCalendar> appCalendars;
   final CalendarEvent? event;
   final List<String> todoSuggestions;
 
@@ -205,6 +209,7 @@ class _EventAddDialogState extends State<EventAddDialog> {
   late bool hasTodos;
   late List<String> todos;
   String? personId;
+  String? appCalendarId;
 
   @override
   void initState() {
@@ -219,6 +224,7 @@ class _EventAddDialogState extends State<EventAddDialog> {
     hasTodos = event?.hasTodos ?? false;
     todos = [...event?.todos ?? const <String>[]];
     personId = event?.personId == everyonePersonId ? null : event?.personId;
+    appCalendarId = event?.appCalendarId;
   }
 
   @override
@@ -303,6 +309,28 @@ class _EventAddDialogState extends State<EventAddDialog> {
                 ],
                 onChanged: (value) => setState(() => personId = value),
               ),
+              if (widget.appCalendars.isNotEmpty) ...[
+                const SizedBox(height: 12),
+                DropdownButtonFormField<String?>(
+                  initialValue: appCalendarId,
+                  decoration: const InputDecoration(
+                    labelText: 'Melyik napt\u00e1rban legyen?',
+                  ),
+                  items: [
+                    const DropdownMenuItem<String?>(
+                      value: null,
+                      child: Text('F\u0151 csal\u00e1di napt\u00e1r'),
+                    ),
+                    ...widget.appCalendars.map(
+                      (calendar) => DropdownMenuItem<String?>(
+                        value: calendar.id,
+                        child: Text(calendar.name),
+                      ),
+                    ),
+                  ],
+                  onChanged: (value) => setState(() => appCalendarId = value),
+                ),
+              ],
               const SizedBox(height: 12),
               TextField(
                 controller: note,
@@ -503,6 +531,7 @@ class _EventAddDialogState extends State<EventAddDialog> {
                 start: start.text,
                 date: eventDate,
                 personId: personId,
+                appCalendarId: appCalendarId,
                 note: note.text,
                 hasTodos: cleanTodos.isNotEmpty,
                 todos: cleanTodos,