Refactor calendar datasource and event management

Enhances calendar flexibility by introducing group-based column spanning and improving cross-mode event handling

Adds support for:
- Dynamic column grouping in date and resource modes
- Consistent event drag-and-drop across different calendar views
- More robust all-day event layout calculations

Improves event management logic to handle resource and date mode transitions more elegantly

src/index.ts

@@ -141,7 +141,7 @@ async function initializeCalendar(): Promise<void> {
     builder.registerType(MockAuditRepository).as<IApiRepository<IAuditEntry>>();
 
     
-    let calendarMode = 'resource' ;
+    let calendarMode = 'date' ;
     // Register DataSource and HeaderRenderer based on mode
     if (calendarMode === 'resource') {
       builder.registerType(ResourceColumnDataSource).as<IColumnDataSource>();