Show more daily orders and deliveries on the calendar

Update CalendarGrid component to display up to 4 items per day, resolving an issue where only 2 items were visible when multiple orders and deliveries occurred on the same day.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: cc2d271b-82f0-4d6a-9302-a0b067ffb429
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/1957c339-2757-4d1f-8e92-e9f71a1ce58e/cc2d271b-82f0-4d6a-9302-a0b067ffb429/tI82cIY

client/src/components/CalendarGrid.tsx

@@ -97,7 +97,7 @@ function CalendarItem({ item, type, onItemClick }: { item: any, type: 'order' |
 // Composant pour gérer l'overflow avec popover
 function DayItemsContainer({ dayOrders, dayDeliveries, onItemClick }: { dayOrders: any[], dayDeliveries: any[], onItemClick: (item: any, type: 'order' | 'delivery') => void }) {
   const [isOpen, setIsOpen] = useState(false);
-  const MAX_VISIBLE_ITEMS = 2;
+  const MAX_VISIBLE_ITEMS = 4;
   const totalItems = dayOrders.length + dayDeliveries.length;
   
   if (totalItems === 0) return null;