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>
   );
 }

refer_landing_page/app/console/_components/AdminLoginForm.tsx

@@ -4,6 +4,7 @@ import React, { useState } from "react";
 import { useRouter } from "next/navigation";
 import { setClientToken } from "./AdminComponents";
 import { adminVerifyToken } from "../../../lib/adminApi";
+import ThemeToggle from "@/components/ThemeToggle";
 
 export function AdminLoginForm({ onLoginSuccess }: { onLoginSuccess?: () => void }) {
   const router = useRouter();
@@ -41,7 +42,10 @@ export function AdminLoginForm({ onLoginSuccess }: { onLoginSuccess?: () => void
   };
 
   return (
-    <div className="w-full max-w-md bg-paper border border-line rounded-lg shadow-lg p-8">
+    <div className="w-full max-w-md bg-paper border border-line rounded-lg shadow-lg p-8 relative">
+      <div className="absolute top-4 right-4">
+        <ThemeToggle />
+      </div>
       <div className="text-center mb-6">
         <h1 className="text-2xl font-bold text-ink">ANL Admin Console</h1>
         <p className="text-sm text-ink/70 mt-1">Enter your admin bearer token to manage laboratory datasets.</p>

refer_landing_page/app/console/layout.tsx

@@ -6,6 +6,7 @@ import { usePathname, useRouter } from "next/navigation";
 import { getClientToken, removeClientToken } from "./_components/AdminComponents";
 import { AdminLoginForm } from "./_components/AdminLoginForm";
 import { adminVerifyToken } from "../../lib/adminApi";
+import ThemeToggle from "@/components/ThemeToggle";
 
 export default function AdminLayout({ children }: { children: React.ReactNode }) {
   const pathname = usePathname();
@@ -98,7 +99,10 @@ export default function AdminLayout({ children }: { children: React.ReactNode })
         <div className="p-6 border-b border-line shrink-0">
           <div className="flex items-center justify-between">
             <span className="font-bold text-lg text-cobalt tracking-tight">ANL Console</span>
-            <span className="text-xs bg-cobalt/10 text-cobalt font-medium px-2 py-0.5 rounded">Admin</span>
+            <div className="flex items-center gap-2">
+              <span className="text-xs bg-cobalt/10 text-cobalt font-medium px-2 py-0.5 rounded">Admin</span>
+              <ThemeToggle />
+            </div>
           </div>
           <p className="text-xs text-ink/60 mt-1">Lab Data Management</p>
         </div>