Sets up calendar package with core infrastructure

Adds core calendar package components including:
- Base services for events, resources, and settings
- Calendar app and orchestrator
- Build and bundling configuration
- IndexedDB storage setup

Prepares foundational architecture for calendar functionality

packages/calendar/src/extensions/departments/DepartmentRenderer.ts

@@ -0,0 +1,25 @@
+import { BaseGroupingRenderer, IGroupingRendererConfig } from '../../core/BaseGroupingRenderer';
+import { DepartmentService } from './DepartmentService';
+import { IDepartment } from '../../types/CalendarTypes';
+
+export class DepartmentRenderer extends BaseGroupingRenderer<IDepartment> {
+  readonly type = 'department';
+
+  protected readonly config: IGroupingRendererConfig = {
+    elementTag: 'swp-department-header',
+    idAttribute: 'departmentId',
+    colspanVar: '--department-cols'
+  };
+
+  constructor(private departmentService: DepartmentService) {
+    super();
+  }
+
+  protected getEntities(ids: string[]): Promise<IDepartment[]> {
+    return this.departmentService.getByIds(ids);
+  }
+
+  protected getDisplayName(entity: IDepartment): string {
+    return entity.name;
+  }
+}