feat: add auth guards to protected routes and extend requireAuth coverage

app/(account)/layout.tsx

@@ -1,4 +1,5 @@
 import { AccountSidebar } from "@/components/account-sidebar"
+import { AuthGuard } from "@/components/auth-guard"
 import { Header } from "@/components/header"
 
 export default function AccountLayout({ children }: { children: React.ReactNode }) {
@@ -9,7 +10,9 @@ export default function AccountLayout({ children }: { children: React.ReactNode
         <div className="hidden md:block">
           <AccountSidebar />
         </div>
-        <main className="flex-1 p-6">{children}</main>
+        <main className="flex-1 p-6">
+          <AuthGuard>{children}</AuthGuard>
+        </main>
       </div>
     </div>
   )