Add ability for poll author to terminate a poll

ts/components/conversation/PollTerminateNotification.dom.tsx

@@ -0,0 +1,53 @@
+// Copyright 2025 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import React from 'react';
+import type { LocalizerType } from '../../types/Util.std.js';
+import type { ConversationType } from '../../state/ducks/conversations.preload.js';
+import { SystemMessage } from './SystemMessage.dom.js';
+import { Button, ButtonVariant, ButtonSize } from '../Button.dom.js';
+
+export type PropsType = {
+  sender: ConversationType;
+  pollQuestion: string;
+  pollMessageId: string;
+  conversationId: string;
+  i18n: LocalizerType;
+  scrollToPollMessage: (messageId: string, conversationId: string) => unknown;
+};
+
+export function PollTerminateNotification({
+  sender,
+  pollQuestion,
+  pollMessageId,
+  conversationId,
+  i18n,
+  scrollToPollMessage,
+}: PropsType): JSX.Element {
+  const message = sender.isMe
+    ? i18n('icu:PollTerminate--you', { poll: pollQuestion })
+    : i18n('icu:PollTerminate--other', {
+        name: sender.title,
+        poll: pollQuestion,
+      });
+
+  const handleViewPoll = () => {
+    scrollToPollMessage(pollMessageId, conversationId);
+  };
+
+  return (
+    <SystemMessage
+      symbol="poll"
+      contents={message}
+      button={
+        <Button
+          onClick={handleViewPoll}
+          variant={ButtonVariant.SystemMessage}
+          size={ButtonSize.Small}
+        >
+          {i18n('icu:PollTerminate__view-poll')}
+        </Button>
+      }
+    />
+  );
+}