fix: keep sites shown in left menu bar

Author: hsluoyz

web/src/SiteEditPage.js

@@ -296,7 +296,11 @@ class SiteEditPage extends React.Component {
                 checkedKeys={site.navItems ?? ["all"]}
                 defaultExpandedKeys={["all"]}
                 onCheck={(checked) => {
-                  this.updateSiteField("navItems", checked);
+                  const checkedArr = Array.isArray(checked) ? [...checked] : [...checked.checked];
+                  if (!checkedArr.includes("/sites")) {
+                    checkedArr.push("/sites");
+                  }
+                  this.updateSiteField("navItems", checkedArr);
                 }}
               />,
               24

web/src/component/nav-item-tree/NavItemTree.js

@@ -86,7 +86,7 @@ export const NavItemTree = ({disabled, checkedKeys, defaultExpandedKeys, onCheck
           title: i18next.t("general:Admin"),
           key: "/admin",
           children: [
-            {title: i18next.t("general:Sites"), key: "/sites"},
+            {title: i18next.t("general:Sites"), key: "/sites", disableCheckbox: true},
             {title: i18next.t("general:Resources"), key: "/resources"},
             {title: i18next.t("general:Usages"), key: "/usages"},
             {title: i18next.t("general:Visitors"), key: "/visitors"},