feat: Add has_item helper to Inventory

src/features/inventory/components.rs

@@ -114,6 +114,14 @@ pub struct Inventory {
 }
 
 impl Inventory {
+    pub fn has_item(&self, items_query: Query<&ItemStack>) -> bool {
+        self.items
+            .iter()
+            .map(|entity| items_query.get(*entity).ok())
+            .find(|option| option.is_some())
+            .is_some()
+    }
+
     pub fn update_item_stack(
         &mut self,
         commands: &mut Commands,