Enable send to zulip

www/app/[domain]/transcripts/shareZulip.tsx

@@ -2,21 +2,27 @@ import { useState } from "react";
 import { featureEnabled } from "../domainContext";
 import ShareModal from "./[transcriptId]/shareModal";
 import { GetTranscript, GetTranscriptTopic } from "../../api";
-import { Button } from "@chakra-ui/react";
+import { BoxProps, Button } from "@chakra-ui/react";
 
 type ShareZulipProps = {
   transcriptResponse: GetTranscript;
   topicsResponse: GetTranscriptTopic[];
+  disabled: boolean;
 };
 
-export default function ShareZulip(props: ShareZulipProps) {
+export default function ShareZulip(props: ShareZulipProps & BoxProps) {
   const [showModal, setShowModal] = useState(false);
   if (!featureEnabled("sendToZulip")) return null;
 
   return (
     <>
-      <Button colorScheme="blue" onClick={() => setShowModal(true)}>
-        ➡️ Zulip
+      <Button
+        colorScheme="blue"
+        size={"sm"}
+        isDisabled={props.disabled}
+        onClick={() => setShowModal(true)}
+      >
+        ➡️ Send to Zulip
       </Button>
 
       <ShareModal