Clear "already subscribed" newsletter error on next interaction

Matches standard form-validation behavior: any further edit to the
email or consent checkbox after the already-subscribed message
appears now dismisses it, instead of leaving it stuck until submit.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/newsletter/components/WeeklyImpulsesHero.tsx

@@ -35,7 +35,7 @@ const checklist = [
 ];
 
 export function WeeklyImpulsesHero() {
-  const { email, emailError, consent, setConsent, status, error, successMessage, emailRef, handleEmailChange, handleEmailBlur, handleSubmit } =
+  const { email, emailError, consent, handleConsentChange, status, error, successMessage, emailRef, handleEmailChange, handleEmailBlur, handleSubmit } =
     useNewsletterSignup("newsletter-hero");
 
   return (
@@ -155,7 +155,7 @@ export function WeeklyImpulsesHero() {
                     type="checkbox"
                     required
                     checked={consent}
-                    onChange={(e) => setConsent(e.target.checked)}
+                    onChange={(e) => handleConsentChange(e.target.checked)}
                     className="size-4 shrink-0 mt-0.5 rounded-xs border border-border accent-brand"
                   />
                   <span className="text-label text-text-primary font-normal leading-normal">