Enhances event layout engine with advanced rendering logic

Introduces sophisticated event layout algorithm for handling complex scheduling scenarios

Adds support for:
- Grid and stacked event rendering
- Automatic column allocation
- Nested event stacking
- Threshold-based event grouping

Improves visual representation of overlapping and concurrent events

src/v2/managers/ResizeManager.ts

@@ -94,7 +94,7 @@ export class ResizeManager {
     const element = handle.parentElement as HTMLElement;
     if (!element) return;
 
-    const eventId = element.dataset.id || '';
+    const eventId = element.dataset.eventId || '';
     const startHeight = element.offsetHeight;
     const startDurationMinutes = pixelsToMinutes(startHeight, this.gridConfig);