fixup! ♿️(frontend) limit share modal opening announcement for screen readers

src/frontend/apps/impress/src/features/docs/doc-share/components/DocShareModal.tsx

@@ -168,9 +168,12 @@ export const DocShareModal = ({ doc, onClose, isRootDoc = true }: Props) => {
   // accessibility tree during the opening announcement, then restore it.
   useEffect(() => {
     if (canShare) {
+      setIsContentAccessible(true);
       return;
     }
 
+    setIsContentAccessible(false);
+
     const id = window.setTimeout(() => {
       setIsContentAccessible(true);
     }, DEBOUNCE_MS);