Single isntances and some updates shit.

Wino.Core.Domain/Interfaces/ICalendarItem.cs

@@ -1,5 +1,6 @@
 using System;
 using Itenso.TimePeriod;
+using Wino.Core.Domain.Models.Calendar;
 
 namespace Wino.Core.Domain.Interfaces;
 
@@ -19,4 +20,13 @@ public interface ICalendarItem
     bool IsRecurringChild { get; }
     bool IsRecurringParent { get; }
     bool IsRecurringEvent { get; }
+
+    /// <summary>
+    /// Gets the display title for this calendar item when rendered in a specific day.
+    /// For multi-day events, includes start/end time indicators.
+    /// </summary>
+    /// <param name="displayingPeriod">The period of the day where this item is being rendered.</param>
+    /// <param name="calendarSettings">Calendar settings for time formatting.</param>
+    /// <returns>The formatted title string.</returns>
+    string GetDisplayTitle(ITimePeriod displayingPeriod, CalendarSettings calendarSettings);
 }

Wino.Core.Domain/Interfaces/ICalendarItemViewModel.cs

@@ -1,4 +1,8 @@
-namespace Wino.Core.Domain.Interfaces;
+using Itenso.TimePeriod;
+using Wino.Core.Domain.Entities.Calendar;
+using Wino.Core.Domain.Models.Calendar;
+
+namespace Wino.Core.Domain.Interfaces;
 
 /// <summary>
 /// Temporarily to enforce CalendarItemViewModel. Used in CalendarEventCollection.
@@ -6,4 +10,21 @@
 public interface ICalendarItemViewModel
 {
     bool IsSelected { get; set; }
+
+    /// <summary>
+    /// The period of the day where this item is currently being displayed.
+    /// </summary>
+    ITimePeriod DisplayingPeriod { get; set; }
+
+    /// <summary>
+    /// Calendar settings for time formatting.
+    /// </summary>
+    CalendarSettings CalendarSettings { get; set; }
+
+    /// <summary>
+    /// Updates the view model's underlying CalendarItem from new data.
+    /// This allows in-place updates without removing and re-adding items.
+    /// </summary>
+    /// <param name="calendarItem">The updated calendar item data.</param>
+    void UpdateFrom(CalendarItem calendarItem);
 }

Wino.Core.Domain/Interfaces/ICalendarService.cs

@@ -24,16 +24,8 @@ public interface ICalendarService
     /// </summary>
     /// <param name="calendar">The calendar to retrieve events from.</param>
     /// <param name="period">The time period to query events for.</param>
-    /// <returns>List of calendar items including regular events and recurring event occurrences.</returns>
+    /// <returns>List of calendar items that fall within the requested period.</returns>
     Task<List<CalendarItem>> GetCalendarEventsAsync(IAccountCalendar calendar, ITimePeriod period);
-
-    /// <summary>
-    /// Expands a recurring calendar item to check if any of its occurrences fall within the given periods.
-    /// </summary>
-    /// <param name="calendarItem">The calendar item to expand (can be recurring or non-recurring).</param>
-    /// <param name="periods">The list of periods to check against.</param>
-    /// <returns>List of calendar items (either the original item or expanded recurrence instances) that fall within the periods.</returns>
-    Task<List<CalendarItem>> GetExpandedRecurringEventsForPeriodsAsync(CalendarItem calendarItem, IEnumerable<ITimePeriod> periods);
     
     Task<CalendarItem> GetCalendarItemAsync(Guid accountCalendarId, string remoteEventId);
     Task UpdateCalendarDeltaSynchronizationToken(Guid calendarId, string deltaToken);