Fixed the display date of the calendar items. Created test project for core library, included tests for recurring calendar events.

Wino.Core.Domain/Interfaces/ICalendarService.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Threading.Tasks;
+using Itenso.TimePeriod;
 using Wino.Core.Domain.Entities.Calendar;
 using Wino.Core.Domain.Models.Calendar;
 
@@ -16,7 +17,15 @@ public interface ICalendarService
     Task InsertAccountCalendarAsync(AccountCalendar accountCalendar);
     Task UpdateAccountCalendarAsync(AccountCalendar accountCalendar);
     Task CreateNewCalendarItemAsync(CalendarItem calendarItem, List<CalendarEventAttendee> attendees);
-    Task<List<CalendarItem>> GetCalendarEventsAsync(IAccountCalendar calendar, DayRangeRenderModel dayRangeRenderModel);
+    
+    /// <summary>
+    /// Retrieves calendar events for a given calendar within the specified time period.
+    /// </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>
+    Task<List<CalendarItem>> GetCalendarEventsAsync(IAccountCalendar calendar, ITimePeriod period);
+    
     Task<CalendarItem> GetCalendarItemAsync(Guid accountCalendarId, string remoteEventId);
     Task UpdateCalendarDeltaSynchronizationToken(Guid calendarId, string deltaToken);
 

Wino.Core.Domain/Interfaces/IStatePersistenceService.cs

@@ -28,6 +28,16 @@ public interface IStatePersistanceService : INotifyPropertyChanged
     /// </summary>
     bool IsBackButtonVisible { get; }
 
+    /// <summary>
+    /// Current application mode (Mail or Calendar).
+    /// Not persisted to configuration, only kept in memory.
+    /// </summary>
+    WinoApplicationMode ApplicationMode { get; set; }
+
+    /// <summary>
+    /// Whether event details page is visible in Calendar mode.
+    /// </summary>
+    bool IsEventDetailsVisible { get; set; }
 
     /// <summary>
     /// Setting: Opened pane length for the navigation view.

Wino.Core.Domain/Interfaces/IWinoNavigationService.cs

@@ -12,6 +12,6 @@ public interface INavigationService
                          NavigationTransitionType transition = NavigationTransitionType.None);
 
     Type GetPageType(WinoPage winoPage);
-    void GoBack();
     bool ChangeApplicationMode(WinoApplicationMode mode);
+    void GoBack();
 }