Refactors grid date handling and event rendering

Replaces getPeriodRange with getDisplayDates approach
Simplifies event rendering by using flexible date array
Updates event rendering to work with dynamic date lists

Improves code modularity and reduces complexity

src/managers/GridManager.ts

@@ -94,8 +94,8 @@ export class GridManager {
       this.currentDate
     );
 
-    // Calculate period range
-    const periodRange = this.getPeriodRange();
+    // Get display dates for current view
+    const dates = this.getDisplayDates();
 
     // Get layout config based on current view
     const layoutConfig = this.getLayoutConfig();
@@ -104,8 +104,7 @@ export class GridManager {
     eventBus.emit(CoreEvents.GRID_RENDERED, {
       container: this.container,
       currentDate: this.currentDate,
-      startDate: periodRange.startDate,
-      endDate: periodRange.endDate,
+      dates: dates,
       layoutConfig: layoutConfig,
       columnCount: layoutConfig.columnCount
     });
@@ -131,37 +130,6 @@ export class GridManager {
     }
   }
 
-  /**
-   * Get period range for current view
-   */
-  private getPeriodRange(): { startDate: Date; endDate: Date } {
-    switch (this.currentView) {
-      case 'week':
-        const weekStart = this.getISOWeekStart(this.currentDate);
-        const weekEnd = this.getWeekEnd(this.currentDate);
-        return {
-          startDate: weekStart,
-          endDate: weekEnd
-        };
-      case 'month':
-        return {
-          startDate: this.getMonthStart(this.currentDate),
-          endDate: this.getMonthEnd(this.currentDate)
-        };
-      case 'day':
-        return {
-          startDate: this.currentDate,
-          endDate: this.currentDate
-        };
-      default:
-        const defaultWeekStart = this.getISOWeekStart(this.currentDate);
-        const defaultWeekEnd = this.getWeekEnd(this.currentDate);
-        return {
-          startDate: defaultWeekStart,
-          endDate: defaultWeekEnd
-        };
-    }
-  }
 
   /**
    * Get layout config for current view