Comments on plays

- Anyone who can see a play can read its comments; the player and the people they follow can write.
  The author, the player and admins can delete; comments can be reported (admins see the text).
- Notifications: "commented on" for the player, "replied on" for earlier commenters, each with its
  own setting. Reaction and comment notifications now open the play.
- A 💬 chip with the count next to reactions on the feed and recent plays, opening the thread on
  the app (/play/[id]) and the website. Threads refresh every few seconds while open.
- Blocking removes comments between the two people. Plays with comments survive history trimming.
- Privacy page updated.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011Y2iUsKEWDuRGjK5FPmcUP

apps/web/src/components/RecentPlays.tsx

@@ -48,7 +48,7 @@ export function RecentPlays({
               ) : (
                 <div className="recent-row">{row}</div>
               )}
-              <Reactions listenId={p.listenId} reactions={p.reactions} ownerId={ownerId} />
+              <Reactions listenId={p.listenId} reactions={p.reactions} ownerId={ownerId} commentCount={p.commentCount ?? 0} />
             </li>
           );
         })}