Changes: - Replaced simulated API call with real fetch() to /api/contact - Added errorMessage state for custom error messages - Implemented proper response handling for different status codes: * 200: Success message and form reset * 429: Rate limit error with time until retry * 400/500: Display API error messages - Enhanced rate limit error display with human-readable time formatting - Added VERIFICATION_STEPS.md for manual testing guidance Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>