Improve web calendar layout and shared sync state

lib/google_calendar_page.dart

@@ -12,6 +12,7 @@ class AccountsPage extends StatefulWidget {
     required this.languageCode,
     required this.onChanged,
     required this.onSyncedEventsChanged,
+    this.onWorkspaceStateShouldUpload,
   });
 
   final List<GoogleCalendarConnection> connections;
@@ -23,6 +24,7 @@ class AccountsPage extends StatefulWidget {
   final String languageCode;
   final ValueChanged<List<GoogleCalendarConnection>> onChanged;
   final ValueChanged<List<CalendarEvent>> onSyncedEventsChanged;
+  final VoidCallback? onWorkspaceStateShouldUpload;
 
   @override
   State<AccountsPage> createState() => _AccountsPageState();
@@ -429,6 +431,7 @@ class _AccountsPageState extends State<AccountsPage>
             : '${synced.length} Google esem\u00e9ny szinkroniz\u00e1lva \u00e9s JSON cache-be mentve.'
                   '${syncDetails.isEmpty ? '' : ' R\u00e9szletek: ${syncDetails.join('; ')}.'}';
       });
+      widget.onWorkspaceStateShouldUpload?.call();
     } catch (error) {
       setState(() {
         syncing = false;