feat: Add support for Slack reaction and message notifications

src/integrations/slack/preview/SlackReactionPreview.tsx

@@ -0,0 +1,26 @@
+import { getNotificationHtmlUrl, Notification } from "../../../notification";
+import { Detail, ActionPanel, Action } from "@raycast/api";
+import { SlackReaction } from "../types";
+import { useMemo } from "react";
+
+interface SlackReactionPreviewProps {
+  notification: Notification;
+  slack_reaction: SlackReaction;
+}
+
+export function SlackReactionPreview({ notification }: SlackReactionPreviewProps) {
+  const notificationHtmlUrl = useMemo(() => {
+    return getNotificationHtmlUrl(notification);
+  }, [notification]);
+
+  return (
+    <Detail
+      markdown={`# ${notification.title}`}
+      actions={
+        <ActionPanel>
+          <Action.OpenInBrowser url={notificationHtmlUrl} />
+        </ActionPanel>
+      }
+    />
+  );
+}