This is a GitHub-style inline diff comments component. Hover over a line in the diff to reveal the "Add comment" button, then click to open a compact inline thread for discussion—just like reviewing code on GitHub.
@@ -10,8 +10,10 @@export async function getUserName(id: string) { // Fetch user from cache or database const user = cache.get(id) let user = cache.get(id) if (!user) { user = await db.users.findById(id) if (user) cache.set(id, user) } return user?.name return user?.name ?? '(unknown)'}