Add compendium data

module/applications/sheets/character-sheet.mjs

@@ -19,6 +19,7 @@ export default class HellbornCharacterSheet extends HellbornActorSheet {
       createMalefica: HellbornCharacterSheet.#onCreateMalefica,
       createRitual: HellbornCharacterSheet.#onCreateRitual,
       createPerk: HellbornCharacterSheet.#onCreatePerk,
+      modifyAmmo: HellbornCharacterSheet.#onModifyAmmo,
     },
   }
 
@@ -169,6 +170,18 @@ export default class HellbornCharacterSheet extends HellbornActorSheet {
     this.document.createEmbeddedDocuments("Item", [{ name: game.i18n.localize("HELLBORN.Label.newPerk"), type: "perk" }])
   }
 
+  static async #onModifyAmmo(event, target) {
+    const quantity = parseInt($(event.target).data("quantity"))
+    const itemId = $(event.target).data("item-id")
+    const item = this.document.items.get(itemId)
+    if (!item) {
+      console.warn(`HellbornCharacterSheet: Item with ID ${itemId} not found`)
+      return
+    }
+    const currentAmmo = item.system.ammoQuantity || 0
+    const newAmmo = Math.max(0, currentAmmo + quantity) // Ensure ammo doesn't go below 0
+    await item.update({ "system.ammoQuantity": newAmmo })
+  }
 
   /**
    * Handles the roll action triggered by user interaction.