Remove players from multiplayer room on leave if they have no stats or buzzes

[Copilot]

Players who join and immediately leave (never buzzing or hearing a completed tossup) were kept as offline "ghost" entries in the room's player list. These should be fully removed rather than retained as offline.

Changes

• Player.js: Add buzzes field (reset in clearStats()) and hasActivity() method — returns true if any of tuh, buzzes, powers, tens, zeroes, or negs are non-zero
• TossupRoom.js: Increment player.buzzes on each buzz
• Room.js: leave() now branches on player.hasActivity():
  • No activity → delete from players and teams, emit { type: 'leave', remove: true }
  • Has activity → existing offline behavior unchanged
• MultiplayerTossupBonusClient.js: Client leave() handler removes the DOM element and player state when remove: true; otherwise falls through to existing offline styling

// Room.js
leave (userId) {
  if (!this.players[userId]) { return; }
  const player = this.players[userId];
  const username = player.username;
  delete this.sockets[userId];
  if (!player.hasActivity()) {
    delete this.players[userId];
    delete this.teams[userId];
    this.emitMessage({ type: 'leave', userId, username, remove: true });
  } else {
    player.online = false;
    this.emitMessage({ type: 'leave', userId, username });
  }
}

On reconnect after removal, the player is treated as isNew and gets a fresh entry — no special handling needed.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Remove players from multiplayer room on leave if they record no stats and no buzzes</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Remove players from multiplayer room on leave if they record no stats and no buzzes #453

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