Refactored the calendar synchronization code using AI.

Wino.Core.Domain/Enums/AttendeeResponseStatus.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Wino.Core.Domain.Enums;
+/// <summary>
+/// Represents the response status of an attendee to a calendar event
+/// </summary>
+public enum AttendeeResponseStatus
+{
+    /// <summary>
+    /// The attendee has not responded to the invitation
+    /// </summary>
+    NeedsAction = 0,
+
+    /// <summary>
+    /// The attendee has accepted the invitation
+    /// </summary>
+    Accepted = 1,
+
+    /// <summary>
+    /// The attendee has declined the invitation
+    /// </summary>
+    Declined = 2,
+
+    /// <summary>
+    /// The attendee has tentatively accepted the invitation
+    /// </summary>
+    Tentative = 3
+}

Wino.Core.Domain/Enums/CalendarItemType.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Wino.Core.Domain.Enums;
+public enum CalendarItemType
+{
+    /// <summary>
+    /// A standard timed event with specific start and end times on the same day
+    /// </summary>
+    Timed = 0,
+
+    /// <summary>
+    /// An all-day event that spans exactly one day
+    /// </summary>
+    AllDay = 1,
+
+    /// <summary>
+    /// A multi-day event that spans more than one day but has specific times
+    /// </summary>
+    MultiDay = 2,
+
+    /// <summary>
+    /// A multi-day all-day event (e.g., vacation, conference spanning multiple days)
+    /// </summary>
+    MultiDayAllDay = 3,
+
+    /// <summary>
+    /// A recurring event with a defined pattern (daily, weekly, monthly, yearly)
+    /// </summary>
+    Recurring = 4,
+
+    /// <summary>
+    /// A recurring all-day event (e.g., annual holiday, weekly all-day event)
+    /// </summary>
+    RecurringAllDay = 5,
+
+    /// <summary>
+    /// A single instance of a recurring event that has been modified
+    /// </summary>
+    RecurringException = 6,
+
+    /// <summary>
+    /// An event that extends beyond midnight but is not multi-day (e.g., 11 PM to 2 AM)
+    /// </summary>
+    CrossMidnight = 7,
+}