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/components/Newsletter.tsx

@@ -34,7 +34,7 @@ export function Newsletter({
   title = <>Starte mit einer Woche voller Klarheit<span className="text-brand">.</span></>,
   description = "Melde dich zum Newsletter an und erhalte die 7-Tage-Challenge, mit der du durch mehr Struktur weniger Stress spürst.",
 }: NewsletterProps = {}) {
-  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-page");
 
   return (
@@ -138,7 +138,7 @@ export function Newsletter({
                     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">

app/components/NewsletterModal.tsx

@@ -35,7 +35,7 @@ const features = [
 export function NewsletterModal({ open, onClose }: { open: boolean; onClose: () => void }) {
   const dialogRef = useRef<HTMLDivElement>(null);
   const closeButtonRef = useRef<HTMLButtonElement>(null);
-  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-modal");
 
   // Background scroll lock while open — intercepts and cancels the wheel/
@@ -223,7 +223,7 @@ export function NewsletterModal({ open, onClose }: { open: boolean; onClose: ()
                     type="checkbox"
                     required
                     checked={consent}
-                    onChange={(e) => setConsent(e.target.checked)}
+                    onChange={(e) => handleConsentChange(e.target.checked)}
                     className="size-4 shrink-0 rounded-xs border border-border accent-brand"
                   />
                   <span className="text-label text-text-primary">