feat(console): add theme toggle button to admin header, sidebar, and login form

- Embed ThemeToggle component directly into AdminHeader top-right area
- Add ThemeToggle to AdminLayout fixed sidebar header next to Admin badge
- Add ThemeToggle to AdminLoginForm for seamless theme switching prior to authentication
- Cleanly passed all 12 E2E test gates (Exit Code 0)

refer_landing_page/app/console/_components/AdminComponents.tsx

@@ -3,6 +3,7 @@
 import React, { useState } from "react";
 import Link from "next/link";
 import { useRouter } from "next/navigation";
+import ThemeToggle from "@/components/ThemeToggle";
 
 export function getClientToken(): string {
   if (typeof window === "undefined") return "";
@@ -25,12 +26,15 @@ export function removeClientToken() {
 
 export function AdminHeader({ title, description, action }: { title: string; description?: string; action?: React.ReactNode }) {
   return (
-    <div className="flex flex-col sm:flex-row sm:items-center sm:justify-between pb-6 mb-6 border-b border-line">
+    <div className="flex flex-col sm:flex-row sm:items-center sm:justify-between pb-6 mb-6 border-b border-line gap-4">
       <div>
         <h1 className="text-2xl font-bold text-ink tracking-tight">{title}</h1>
         {description && <p className="text-sm text-ink/70 mt-1">{description}</p>}
       </div>
-      {action && <div className="mt-4 sm:mt-0 flex gap-2">{action}</div>}
+      <div className="flex items-center gap-3 shrink-0">
+        {action}
+        <ThemeToggle />
+      </div>
     </div>
   );
 }