auto-claude: subtask-3-1 - Update ContactForm to call API route instead of simulating

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>

VERIFICATION_STEPS.md

@@ -0,0 +1,55 @@
+# Verification Steps for ContactForm API Integration
+
+## Manual Verification Required
+
+The ContactForm has been updated to call the real API route at `/api/contact` instead of simulating the submission.
+
+### Test in Browser
+
+1. **Navigate to**: http://localhost:3000/en/contact
+
+2. **Test Successful Submission**:
+   - Fill in all form fields (name, email, message)
+   - Click "Send Message"
+   - Verify: Success message appears
+   - Verify: Form fields are cleared
+   - Verify: No console errors
+
+3. **Test Rate Limiting**:
+   - Submit the form 5 times rapidly
+   - On the 6th submission, verify:
+     - Error message appears with rate limit warning
+     - Message shows time until retry (e.g., "Too many requests. Please try again in 60 minutes.")
+     - Form is still functional (not broken)
+
+4. **Test Validation**:
+   - Try submitting with empty fields
+   - Verify validation errors appear
+   - Try submitting with invalid email
+   - Verify email validation error appears
+
+5. **Test Error Display**:
+   - Verify error messages are clearly visible
+   - Verify error messages disappear on successful submission
+   - Check that UI remains user-friendly
+
+### Expected Behavior
+
+- ✅ Form submits to `/api/contact` with POST request
+- ✅ Success message displays on 200 response
+- ✅ Rate limit error displays on 429 response with countdown
+- ✅ Generic error message displays on other errors
+- ✅ Form validation works before API call
+- ✅ Loading state shows during submission
+- ✅ Form is disabled during submission
+
+### Changes Made
+
+1. Added `errorMessage` state to store custom error messages
+2. Replaced simulated API call with real `fetch()` to `/api/contact`
+3. Added response status handling:
+   - 200 (OK): Success message, clear form
+   - 429 (Rate Limited): Display time until retry
+   - 400/500: Display API error message
+4. Improved error message display with custom messages
+