Fix signing page: show canvas unless status is signature_received or mail_sent_to_all

app/sign/[token]/page.tsx

@@ -119,7 +119,8 @@ export default function SignPage() {
     );
   }
 
-  if (submitted || appt.status !== "pending") {
+  const isSigned = submitted || appt.status === "signature_received" || appt.status === "mail_sent_to_all";
+  if (isSigned) {
     return (
       <div className="min-h-screen bg-slate-50 flex items-center justify-center">
         <div className="bg-white rounded-xl shadow p-8 text-center max-w-sm">