feat: redesign auth pages — rounded-[48px] cards, serif titles, orbs, icon inputs

- Auth layout: warm background with brand-accent/ochre orbs, header with Globe + Momento branding
- Login form: serif heading, icon-inputs with focus transitions, uppercase labels, submit with arrow
- Register form: matching card style with User/Mail/Lock icons, confirm password field
- Forgot password: matching card with email icon, success state with mail icon
- Reset password: matching card with Lock icons, invalid link state with AlertCircle
- All text via i18n (new keys: welcomeBack, createYourSpace, forgot, etc.)
- Dark mode support via CSS variables
- Removed shadcn Card/Button/Input dependencies from auth forms

memento-note/app/(auth)/register/page.tsx

@@ -1,7 +1,7 @@
 import { RegisterForm } from '@/components/register-form';
 import { getSystemConfig } from '@/lib/config';
 import { redirect } from 'next/navigation';
- 
+
 export default async function RegisterPage() {
   const config = await getSystemConfig();
   const allowRegister = config.ALLOW_REGISTRATION !== 'false' && process.env.ALLOW_REGISTRATION !== 'false';
@@ -10,11 +10,5 @@ export default async function RegisterPage() {
     redirect('/login');
   }
 
-  return (
-    <main className="flex items-center justify-center md:h-screen">
-      <div className="relative mx-auto flex w-full max-w-[400px] flex-col space-y-2.5 p-4 md:-mt-32">
-        <RegisterForm />
-      </div>
-    </main>
-  );
+  return <RegisterForm />;
 }