Refactor event payload types and event handling

Extracts common event payload interfaces for entity saved, deleted, and audit logged events

Improves type safety and reduces code duplication by centralizing event payload definitions

src/types/EventTypes.ts

@@ -3,7 +3,7 @@
  */
 
 import { IColumnBounds } from "../utils/ColumnDetectionUtils";
-import { ICalendarEvent } from "./CalendarTypes";
+import { ICalendarEvent, EntityType } from "./CalendarTypes";
 
 /**
  * Drag Event Payload Interfaces
@@ -103,4 +103,30 @@ export interface IResizeEndEventPayload {
 export interface INavButtonClickedEventPayload {
   direction: 'next' | 'previous' | 'today';
   newDate: Date;
+}
+
+// Entity saved event payload
+export interface IEntitySavedPayload {
+  entityType: EntityType;
+  entityId: string;
+  operation: 'create' | 'update';
+  changes: any;
+  timestamp: number;
+}
+
+// Entity deleted event payload
+export interface IEntityDeletedPayload {
+  entityType: EntityType;
+  entityId: string;
+  operation: 'delete';
+  timestamp: number;
+}
+
+// Audit logged event payload
+export interface IAuditLoggedPayload {
+  auditId: string;
+  entityType: EntityType;
+  entityId: string;
+  operation: 'create' | 'update' | 'delete';
+  timestamp: number;
 }