feat: handle stacking in inventory and show item count and current/max ammo of ranged weapons

src/scenes/systems/ItemManager.ts

@@ -66,33 +66,47 @@ export class ItemManager {
 
     if (itemActor) {
       const item = itemActor.item;
-      
-      // Stacking Logic
-      if (item.stackable) {
-          const existingItem = player.inventory.items.find(it => it.id === item.id);
-          if (existingItem) {
-              existingItem.quantity = (existingItem.quantity || 1) + (item.quantity || 1);
-              console.log(`Stacked ${item.name}. New quantity: ${existingItem.quantity}`);
-              
-              this.entityManager.removeActor(itemActor.id);
-              return existingItem;
-          }
-      }
-
-      // Add to inventory
-      item.quantity = item.quantity || 1;
-      player.inventory.items.push(item);
+      const result = this.addItem(player, item);
       
       // Remove from world
       this.entityManager.removeActor(itemActor.id);
       
       console.log("Picked up:", item.name);
-      return item;
+      return result;
     }
 
     return null;
   }
 
+  /**
+   * Add an item to player inventory, handling stacking if applicable
+   * @returns The added or modified item
+   */
+  addItem(player: CombatantActor, item: Item): Item {
+    if (!player.inventory) throw new Error("Player has no inventory");
+
+    // Deep clone item (crucial for items with mutable stats like ammo or when picking up from ground)
+    const itemToAdd = { ...item } as Item;
+    if ('stats' in itemToAdd && itemToAdd.stats) {
+        (itemToAdd as any).stats = { ...itemToAdd.stats }; 
+    }
+
+    // Stacking Logic
+    if (itemToAdd.stackable) {
+        const existingItem = player.inventory.items.find(it => it.id === itemToAdd.id);
+        if (existingItem) {
+            existingItem.quantity = (existingItem.quantity || 1) + (itemToAdd.quantity || 1);
+            console.log(`Stacked ${itemToAdd.name}. New quantity: ${existingItem.quantity}`);
+            return existingItem;
+        }
+    }
+
+    // Add to inventory
+    itemToAdd.quantity = itemToAdd.quantity || 1;
+    player.inventory.items.push(itemToAdd);
+    return itemToAdd;
+  }
+
   /**
    * Handle using an item from inventory
    * Returns information about what happened