Action Save difficulty (#427)

* Action Save difficulty

* Unequipped item icon opacity

* Fix sheet header

styles/less/global/inventory-item.less

@@ -105,6 +105,10 @@
                 align-items: center;
                 justify-content: end;
                 gap: 8px;
+                
+                .unequipped {
+                    opacity: .5;
+                }
             }
         }