Filter bad words from multiplayer chat messages server-side

[Copilot]

Chat messages were not screened for inappropriate content, unlike usernames which already used isAppropriateString. This adds the same guard to both chat paths.

Changes

• ServerMultiplayerRoomMixin.js — added isAppropriateString(message) check to chat() and chatLiveUpdate(); messages containing bad words are silently dropped before broadcast

chat ({ userId, username }, { message }) {
  if (this.settings.public && !this.settings.loginRequired) { return false; }
  if (typeof message !== 'string') { return false; }
  if (!isAppropriateString(message)) { return false; }  // added
  this.emitMessage({ type: 'chat', message, username, userId });
}

Reuses the existing isAppropriateString import already present in the file — no new dependencies.

Original prompt

Filter out bad words from multiplayer usernames and chat messages, this should call existing functions, be succinct, and be implemented server-side

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