Merge pull request 'Fix booking flow scroll position on mobile step changes.' (#20) from dev into main

Reviewed-on: #20

frontend/src/app/(public)/book/[eventId]/page.tsx

@@ -228,6 +228,12 @@ export default function BookingPage() {
     }
   }, [agreedToTerms, termsError]);
 
+  // Scroll to top when moving between booking steps (esp. mobile, where
+  // the submit button sits at the bottom of a long form)
+  useEffect(() => {
+    window.scrollTo({ top: 0, behavior: 'smooth' });
+  }, [step]);
+
   const formatDate = (dateStr: string) => formatDateLong(dateStr, locale as 'en' | 'es');
   const fmtTime = (dateStr: string) => formatTime(dateStr, locale as 'en' | 'es');