Remove sqlite base64 contact store from AccountContact.

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

@@ -27,17 +27,9 @@ public class AccountContact : IEquatable<AccountContact>
     /// <summary>
     /// File ID for the contact picture stored on disk.
     /// The actual file lives at {ApplicationDataFolderPath}/contacts/{ContactPictureFileId}.jpg.
-    /// Preferred over Base64ContactPicture — allows native BitmapImage file loading and avoids SQLite bloat.
     /// </summary>
     public Guid? ContactPictureFileId { get; set; }
 
-    /// <summary>
-    /// Legacy base64 encoded profile image of the contact.
-    /// For user-set contact pictures: migrate to file storage via ContactPictureFileId instead.
-    /// Still used for OAuth account profile pictures (MailAccount.Base64ProfilePictureData).
-    /// </summary>
-    public string Base64ContactPicture { get; set; }
-
     /// <summary>
     /// All registered accounts have their contacts registered as root.
     /// Root contacts must not be overridden by any configuration.

Wino.Core.Domain/Interfaces/IMailItemDisplayInformation.cs

@@ -20,7 +20,7 @@ public interface IMailItemDisplayInformation : INotifyPropertyChanged
     bool IsCalendarEvent { get; }
     bool IsFlagged { get; }
     DateTime CreationDate { get; }
-    string Base64ContactPicture { get; }
+    Guid? ContactPictureFileId { get; }
     bool ThumbnailUpdatedEvent { get; }
     bool IsThreadExpanded { get; }
     AccountContact SenderContact { get; }