Refactor resize and event rendering with performance improvements

Optimizes event resize and rendering logic by:
- Simplifying resize handle management
- Improving single column event rendering
- Reducing unnecessary DOM operations
- Removing redundant event caching and subscriptions

Improves performance and reduces complexity in event interaction flow

src/renderers/EventRendererManager.ts

@@ -1,4 +1,3 @@
-import { EventBus } from '../core/EventBus';
 import { IEventBus, ICalendarEvent, IRenderContext } from '../types/CalendarTypes';
 import { CoreEvents } from '../constants/CoreEvents';
 import { EventManager } from '../managers/EventManager';
@@ -262,19 +261,10 @@ export class EventRenderingService {
                 newEnd
             });
 
-            // Find the column for this event
-            const columnElement = element.closest('swp-day-column') as HTMLElement;
-            if (columnElement) {
-                const columnDate = columnElement.dataset.date;
-                if (columnDate) {
-                    // Get column bounds and re-render the column to recalculate stacking/grouping
-                    const columnDateObj = this.dateService.parseISO(`${columnDate}T00:00:00`);
-                    const columnBounds = ColumnDetectionUtils.getColumnBoundsByDate(columnDateObj);
-                    if (columnBounds) {
-                        await this.renderSingleColumn(columnBounds);
-                    }
-                }
-            }
+            let columnBounds = ColumnDetectionUtils.getColumnBoundsByDate(newStart);
+            if (columnBounds)
+                await this.renderSingleColumn(columnBounds);
+
         });
     }