fix

backend/internal/handler/npc.go

@@ -613,11 +613,8 @@ func (h *NPCHandler) HealHero(w http.ResponseWriter, r *http.Request) {
 	}
 
 	h.addLog(hero.ID, "Healed to full HP by a town healer")
-	writeJSON(w, http.StatusOK, map[string]any{
-		"hero":    hero,
-		"healed":  true,
-		"message": "You have been healed to full HP.",
-	})
+	// Flat hero JSON — matches other /hero/* mutating endpoints (use-potion, quest claim) for the TS client.
+	writeJSON(w, http.StatusOK, hero)
 }
 
 // BuyPotion handles POST /api/v1/hero/npc-buy-potion.
@@ -666,8 +663,5 @@ func (h *NPCHandler) BuyPotion(w http.ResponseWriter, r *http.Request) {
 	}
 
 	h.addLog(hero.ID, "Purchased a Healing Potion from a merchant")
-	writeJSON(w, http.StatusOK, map[string]any{
-		"hero":    hero,
-		"message": fmt.Sprintf("You purchased a Healing Potion for %d gold.", potionCost),
-	})
+	writeJSON(w, http.StatusOK, hero)
 }