Calendar attachments.

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

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+using System;
+using SQLite;
+using Wino.Core.Domain.Enums;
+
+namespace Wino.Core.Domain.Entities.Calendar;
+
+/// <summary>
+/// Represents metadata for calendar event attachments.
+/// Actual file content is downloaded on-demand.
+/// </summary>
+public class CalendarAttachment
+{
+    [PrimaryKey]
+    public Guid Id { get; set; }
+
+    /// <summary>
+    /// The calendar item this attachment belongs to.
+    /// </summary>
+    public Guid CalendarItemId { get; set; }
+
+    /// <summary>
+    /// Remote identifier for the attachment from the provider (Outlook, Gmail, etc.).
+    /// </summary>
+    public string RemoteAttachmentId { get; set; }
+
+    /// <summary>
+    /// File name of the attachment.
+    /// </summary>
+    public string FileName { get; set; }
+
+    /// <summary>
+    /// Size of the attachment in bytes.
+    /// </summary>
+    public long Size { get; set; }
+
+    /// <summary>
+    /// MIME content type (e.g., "application/pdf", "image/png").
+    /// </summary>
+    public string ContentType { get; set; }
+
+    /// <summary>
+    /// Whether the attachment has been downloaded to local storage.
+    /// </summary>
+    public bool IsDownloaded { get; set; }
+
+    /// <summary>
+    /// Local file path where the attachment is stored (if downloaded).
+    /// </summary>
+    public string LocalFilePath { get; set; }
+
+    /// <summary>
+    /// When the attachment was last modified.
+    /// </summary>
+    public DateTimeOffset LastModified { get; set; }
+}