fix: BLACK HEART header links to /admin dashboard, not public site

src/app/admin/layout.tsx

@@ -166,7 +166,7 @@ export default function AdminLayout({
           >
             <Menu size={24} />
           </button>
-          <a href="/" className="font-bold hover:text-gold transition-colors">BLACK HEART</a>
+          <a href="/admin" className="font-bold hover:text-gold transition-colors">BLACK HEART</a>
         </header>
 
         <main className="flex-1 p-4 sm:p-6 lg:p-8">{children}</main>