Initial event composing.

Wino.Core.Domain/Models/Calendar/CalendarEventComposeAttachmentDraft.cs

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+using System;
+
+namespace Wino.Core.Domain.Models.Calendar;
+
+public class CalendarEventComposeAttachmentDraft
+{
+    public Guid Id { get; set; }
+    public string FileName { get; set; } = string.Empty;
+    public string FilePath { get; set; } = string.Empty;
+    public string FileExtension { get; set; } = string.Empty;
+    public long Size { get; set; }
+}

Wino.Core.Domain/Models/Calendar/CalendarEventComposeNavigationArgs.cs

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+using System;
+
+namespace Wino.Core.Domain.Models.Calendar;
+
+public class CalendarEventComposeNavigationArgs
+{
+    public Guid? SelectedCalendarId { get; set; }
+    public string Title { get; set; } = string.Empty;
+    public string Location { get; set; } = string.Empty;
+    public bool IsAllDay { get; set; }
+    public DateTime StartDate { get; set; }
+    public DateTime EndDate { get; set; }
+}

Wino.Core.Domain/Models/Calendar/CalendarEventComposeResult.cs

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+using System;
+using System.Collections.Generic;
+using Wino.Core.Domain.Entities.Calendar;
+using Wino.Core.Domain.Enums;
+
+namespace Wino.Core.Domain.Models.Calendar;
+
+public class CalendarEventComposeResult
+{
+    public Guid CalendarId { get; set; }
+    public Guid AccountId { get; set; }
+    public string Title { get; set; } = string.Empty;
+    public string Location { get; set; } = string.Empty;
+    public string HtmlNotes { get; set; } = string.Empty;
+    public DateTime StartDate { get; set; }
+    public DateTime EndDate { get; set; }
+    public bool IsAllDay { get; set; }
+    public string TimeZoneId { get; set; } = string.Empty;
+    public CalendarItemShowAs ShowAs { get; set; }
+    public List<Reminder> SelectedReminders { get; set; } = [];
+    public List<CalendarEventAttendee> Attendees { get; set; } = [];
+    public List<CalendarEventComposeAttachmentDraft> Attachments { get; set; } = [];
+    public string Recurrence { get; set; } = string.Empty;
+    public string RecurrenceSummary { get; set; } = string.Empty;
+}

Wino.Core.Domain/Models/Calendar/CalendarPickerAccountGroup.cs

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+using System.Collections.Generic;
+using Wino.Core.Domain.Entities.Calendar;
+using Wino.Core.Domain.Entities.Shared;
+
+namespace Wino.Core.Domain.Models.Calendar;
+
+public class CalendarPickerAccountGroup
+{
+    public MailAccount Account { get; set; } = null!;
+    public List<AccountCalendar> Calendars { get; set; } = [];
+}

Wino.Core.Domain/Models/Common/PickedFileMetadata.cs

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+using System.IO;
+
+namespace Wino.Core.Domain.Models.Common;
+
+public record PickedFileMetadata(string FullFilePath, long Size)
+{
+    public string FileName => Path.GetFileName(FullFilePath);
+    public string FileExtension => Path.GetExtension(FullFilePath)?.ToLowerInvariant() ?? string.Empty;
+}