Add refresh button

gui/ui/app.slint

@@ -83,8 +83,22 @@ component GoodButtons inherits ScrollView {
     }
 }
 
+component RefreshButton inherits HorizontalLayout {
+    alignment: center;
+    Button {
+        text: "Refresh";
+        width: 40%;
+        clicked() => {
+            State.refresh-list();
+        }
+    }
+}
+
 component AddView inherits VerticalBox {
     in property <[SItem]> list;
+
+    RefreshButton {}
+
     goods := GoodsList {
         items <=> list;
     }
@@ -112,6 +126,8 @@ component AddView inherits VerticalBox {
 component ShopView inherits VerticalBox {
     in property <[SItem]> list;
 
+    RefreshButton {}
+
     goods := GoodsList {
         items <=> list;
     }