fix(ui): center heading in contact form success and error states

components/ContactForm.tsx

@@ -81,7 +81,7 @@ export default function ContactForm() {
             <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={3} d="M5 13l4 4L19 7" />
           </svg>
         </div>
-        <Heading level={3} className="mb-4">
+        <Heading level={3} align="center" className="mb-4">
           {t('form.successTitle') || 'Message Sent!'}
         </Heading>
         <p className="text-text-secondary text-lg mb-8">
@@ -115,7 +115,7 @@ export default function ContactForm() {
             <line x1="9" y1="9" x2="15" y2="15" strokeLinecap="round" strokeLinejoin="round" />
           </svg>
         </div>
-        <Heading level={3} className="mb-4 text-destructive font-black">
+        <Heading level={3} align="center" className="mb-4 text-destructive font-black">
           {t('form.errorTitle') || 'Submission Failed!'}
         </Heading>
         <p className="text-destructive/80 text-lg mb-8 leading-relaxed font-medium">