Initial feature for drag / drop calendar events.

Wino.Core.Tests/CalendarPageViewModelTests.cs

@@ -287,6 +287,30 @@ public class CalendarPageViewModelTests
         }
     }
 
+    [Fact]
+    public void CanChangeStartAndEndDate_ReturnsTrueForOrganizerMatchingAssignedCalendarAccount()
+    {
+        var account = CreateAccount();
+        var calendar = CreateCalendar(account, "Calendar");
+        var accountCalendarViewModel = new AccountCalendarViewModel(account, calendar);
+        var calendarItem = CreateCalendarItem(calendar.Id, new DateTime(2026, 3, 20, 9, 0, 0), "Existing");
+
+        calendarItem.AssignedCalendar = accountCalendarViewModel;
+        calendarItem.OrganizerEmail = account.Address;
+
+        calendarItem.CanChangeStartAndEndDate.Should().BeTrue();
+    }
+
+    [Fact]
+    public void AccountCalendarViewModel_MailAccount_ExposesUnderlyingAccount()
+    {
+        var account = CreateAccount();
+        var calendar = CreateCalendar(account, "Calendar");
+        var accountCalendarViewModel = new AccountCalendarViewModel(account, calendar);
+
+        accountCalendarViewModel.MailAccount.Should().BeSameAs(account);
+    }
+
     private static CalendarPageViewModel CreateViewModel(
         ICalendarService calendarService,
         IPreferencesService preferencesService,

Wino.Core.Tests/Synchronizers/WinoSynchronizerCalendarRequestTests.cs

@@ -79,6 +79,27 @@ public sealed class WinoSynchronizerCalendarRequestTests
         }
     }
 
+    [Fact]
+    public async Task Change_start_and_end_date_request_should_dispatch_to_matching_handler()
+    {
+        var synchronizer = new TestCalendarSynchronizer(throwDuringRequestExecution: false);
+        var calendarItemId = Guid.NewGuid();
+        var request = new ChangeStartAndEndDateRequest(
+            new CalendarItem { Id = calendarItemId },
+            []);
+
+        synchronizer.QueueRequest(request);
+
+        var result = await synchronizer.SynchronizeCalendarEventsAsync(new CalendarSynchronizationOptions
+        {
+            AccountId = synchronizer.Account.Id,
+            Type = CalendarSynchronizationType.ExecuteRequests
+        });
+
+        result.CompletedState.Should().Be(SynchronizationCompletedState.Success);
+        synchronizer.ChangeStartAndEndDateInvocationCount.Should().Be(1);
+    }
+
     public sealed class SynchronizationActionsCompletedRecipient : IRecipient<SynchronizationActionsCompleted>
     {
         public List<Guid> CompletedAccountIds { get; } = [];
@@ -98,6 +119,7 @@ public sealed class WinoSynchronizerCalendarRequestTests
 
         public override uint BatchModificationSize => 1;
         public override uint InitialMessageDownloadCountPerFolder => 0;
+        public int ChangeStartAndEndDateInvocationCount { get; private set; }
 
         public override Task ExecuteNativeRequestsAsync(List<IRequestBundle<object>> batchedRequests, CancellationToken cancellationToken = default)
             => _throwDuringRequestExecution
@@ -107,6 +129,12 @@ public sealed class WinoSynchronizerCalendarRequestTests
         public override List<IRequestBundle<object>> DeleteCalendarEvent(DeleteCalendarEventRequest request)
             => [new TestRequestBundle(new object(), request)];
 
+        public override List<IRequestBundle<object>> ChangeStartAndEndDate(ChangeStartAndEndDateRequest request)
+        {
+            ChangeStartAndEndDateInvocationCount++;
+            return [new TestRequestBundle(new object(), request)];
+        }
+
         public override Task<List<NewMailItemPackage>> CreateNewMailPackagesAsync(
             object message,
             Wino.Core.Domain.Entities.Mail.MailItemFolder assignedFolder,