Remove resource calendar mode support

Simplifies calendar configuration and removes resource-specific code paths

Eliminates complexity around resource-based calendar rendering by:
- Removing ResourceCalendarData type
- Removing resource-specific renderers and managers
- Streamlining event and grid management logic
- Consolidating to single date-based calendar implementation

src/renderers/HeaderRenderer.ts

@@ -1,7 +1,6 @@
 // Header rendering strategy interface and implementations
 
 import { CalendarConfig } from '../core/CalendarConfig';
-import { ResourceCalendarData } from '../types/CalendarTypes';
 import { DateService } from '../utils/DateService';
 
 /**
@@ -18,7 +17,6 @@ export interface HeaderRenderer {
 export interface HeaderRenderContext {
   currentWeek: Date;
   config: CalendarConfig;
-  resourceData?: ResourceCalendarData | null;
 }
 
 /**
@@ -58,34 +56,6 @@ export class DateHeaderRenderer implements HeaderRenderer {
       `;
       (header as any).dataset.date = this.dateService.formatISODate(date);
 
-      calendarHeader.appendChild(header);
-    });
-  }
-}
-
-/**
- * Resource-based header renderer
- */
-export class ResourceHeaderRenderer implements HeaderRenderer {
-  render(calendarHeader: HTMLElement, context: HeaderRenderContext): void {
-    const { resourceData } = context;
-    
-    if (!resourceData) {
-      return;
-    }
-
-    resourceData.resources.forEach((resource) => {
-      const header = document.createElement('swp-resource-header');
-      header.setAttribute('data-resource', resource.name);
-      header.setAttribute('data-employee-id', resource.employeeId);
-      
-      header.innerHTML = `
-        <swp-resource-avatar>
-          <img src="${resource.avatarUrl}" alt="${resource.displayName}" onerror="this.style.display='none'">
-        </swp-resource-avatar>
-        <swp-resource-name>${resource.displayName}</swp-resource-name>
-      `;
-      
       calendarHeader.appendChild(header);
     });
   }