Document newsletter-modal fixes in the README

Error-clears-on-interaction behavior and the modal photo no longer
resizing when the already-subscribed/format-error message appears.

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

README.md

@@ -1227,6 +1227,21 @@ unsynced.
   also needs `BREVO_DOUBLE_OPTIN_TEMPLATE_ID` (no safe default — every
   signup silently no-ops without it) and optionally
   `BREVO_DOI_REDIRECT_URL`.
+- **The already-subscribed error now clears on the next interaction**
+  (2026-07-25), matching standard form-validation behavior instead of
+  sitting there until the next submit — `useNewsletterSignup.ts`'s
+  `handleEmailChange`/new `handleConsentChange` both call a shared
+  `clearSubmitError()` that resets `status`/`error` back to idle. This
+  replaced the hook's previously-exposed raw `setConsent` with
+  `handleConsentChange` in its return value — all 4 consuming forms
+  updated to match.
+- **`NewsletterModal.tsx`'s photo no longer resizes when the error
+  appears** (2026-07-25) — the modal's left photo stretches
+  (`items-stretch`, `md:aspect-auto`) to match the right column's height,
+  so the emailError/already-subscribed messages growing that column used
+  to visibly grow the photo along with it. Both messages are now always
+  rendered with a reserved `min-h-[1.05rem]` instead of conditionally
+  mounted, so toggling them no longer changes the column's height at all.
 
 ## Orders & customer accounts