fix(settings): restore theme toggle on OKX settings page

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/common/static/instance_embed.js

@@ -238,16 +238,37 @@
     tabBooted.clear();
   }
 
+  function syncShellChrome(tab) {
+    const onSettings = tab === "settings";
+    document.querySelectorAll(".instance-header-panel, .instance-top-bar").forEach((el) => {
+      el.hidden = onSettings;
+    });
+  }
+
+  function initPaneThemeToggle(tab) {
+    if (tab !== "settings") return;
+    const pane = tabPanes.get(tab);
+    if (!pane || !global.InstanceTheme) return;
+    if (typeof global.InstanceTheme.initToggleUI === "function") {
+      global.InstanceTheme.initToggleUI(pane);
+    }
+    if (typeof global.InstanceTheme.syncToggleUI === "function") {
+      global.InstanceTheme.syncToggleUI(pane);
+    }
+  }
+
   function activateTab(tab, opts) {
     const options = opts || {};
     const revisit = !!options.revisit;
     const firstBoot = !tabBooted.has(tab);
+    syncShellChrome(tab);
     showPane(tab);
     setNavActive(tab);
     if (!options.skipUrl) syncUrl(tab, !!options.replace);
     notifyParentTabSwitch(tab);
     if (firstBoot) {
       bootPaneScripts(tab);
+      initPaneThemeToggle(tab);
       runPageInit(tab, { revisit: false });
       return;
     }
@@ -409,7 +430,11 @@
     patchApplyListWindow();
     patchHardNavigations();
     initBootPane();
+    if (getTab() === "settings") {
+      initPaneThemeToggle("settings");
+    }
     bindNav();
+    syncShellChrome(getTab());
     runPageInit(getTab());
     preloadAllTabs();
     try {