Calendar invitations for Mail part of the app.

Wino.Core.Domain/Entities/Calendar/CalendarItem.cs

@@ -140,6 +140,12 @@ public class CalendarItem : ICalendarItem
     public string HtmlLink { get; set; }
     public CalendarItemStatus Status { get; set; }
     public CalendarItemVisibility Visibility { get; set; }
+    
+    /// <summary>
+    /// Indicates how the event should be shown in the calendar (Free, Busy, Tentative, etc.).
+    /// </summary>
+    public CalendarItemShowAs ShowAs { get; set; } = CalendarItemShowAs.Busy;
+    
     public DateTimeOffset CreatedAt { get; set; }
     public DateTimeOffset UpdatedAt { get; set; }
     public Guid CalendarId { get; set; }

Wino.Core.Domain/Entities/Mail/MailCopy.cs

@@ -103,6 +103,11 @@ public class MailCopy
     /// </summary>
     public bool HasAttachments { get; set; }
 
+    /// <summary>
+    /// Type of mail item (regular mail, calendar invitation, calendar response, etc.).
+    /// </summary>
+    public MailItemType ItemType { get; set; } = MailItemType.Mail;
+
     /// <summary>
     /// Assigned draft id.
     /// </summary>

Wino.Core.Domain/Entities/Shared/MailAccount.cs

@@ -78,6 +78,14 @@ public class MailAccount
     /// </summary>
     public SpecialImapProvider SpecialImapProvider { get; set; }
 
+    /// <summary>
+    /// Gets or sets whether calendar access is granted for this account.
+    /// When false, synchronizers will not process EventMessages or calendar invitations.
+    /// Default is false for existing accounts to prevent scope issues.
+    /// New accounts created after this feature will have this set to true.
+    /// </summary>
+    public bool IsCalendarAccessGranted { get; set; }
+
     /// <summary>
     /// Contains the merged inbox this account belongs to.
     /// Ignored for all SQLite operations.