Add EventOccurrenceParserService and update service registrations

Registered the new EventOccurrenceParserService in Program.cs to handle event occurrence parsing. Updated the _Imports.razor file to reflect the renaming of the EventCalendar component to Calendar. Removed the obsolete EventCalendar component to streamline the codebase.

WebApp/Program.cs

@@ -173,6 +173,7 @@ builder.Services.AddDatabaseDeveloperPageExceptionFilter();
 builder.Services.AddScoped<ClipboardService>();
 builder.Services.AddScoped<WebApp.LocalStorageService>();
 builder.Services.AddScoped<WebApp.Services.IEventOccurrenceService, WebApp.Services.EventOccurrenceService>();
+builder.Services.AddScoped<Core.Services.IEventOccurrenceParserService, Core.Services.EventOccurrenceParserService>();
 
 // State container for maintaining state per user connection (Blazor Server)
 builder.Services.AddScoped<StateContainer>();