1. Auto-login after checkout:
- Added wp_set_auth_cookie() and wp_set_current_user() in CheckoutController
- Auto-registered users are now logged in when thank-you page loads
2. ThankYou page guest buttons:
- Added 'Login / Create Account' button for guests
- Shows for both receipt and basic templates
- No more dead-end after placing order as guest
3. Forgot password flow:
- Created ForgotPassword page component (/forgot-password route)
- Added forgot_password API endpoint in AuthController
- Uses WordPress retrieve_password() for reset email
- Replaced wp-login.php link in Login page
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