Livechat widget: `normalizeMessages()` async predicate in `Array.filter` is a no-op — thread-reply quoted context never renders

Description:

normalizeMessages() in packages/livechat/src/lib/threads.ts passes an async callback to Array.prototype.filter:

export const normalizeMessages = (messages: any[] = []): Promise<any[]> =>
	Promise.all(
		messages.filter(async (message) => {
			const result = await normalizeMessage(message);
			return result;
		}),
	);

Array.filter's predicate must be synchronous. An async function always returns a Promise, which is truthy, so filter keeps every message unchanged - normalizeMessage() never actually runs its intended logic. normalizeMessage() is meant to:

1. drop thread-reply messages already registered as parents, and
2. attach threadMsg / quoted-parent data to reply messages so Message/index.tsx can render a "replying to" preview bubble.

Because the filter is a no-op, thread replies shown in the Livechat widget render as flat standalone messages with no quoted-parent context.

This was introduced (and self-flagged) in #41559 during the TS migration - the PR left a FIXME comment noting it as a known latent bug surfaced by the type checker, to be "revisited separately," but it was never filed or fixed.

Steps to reproduce:

1. Open the Livechat widget on a site with Livechat enabled.
2. Start a conversation and reply in a thread from the agent side.
3. Observe the reply as it renders in the visitor-facing widget message list.

Expected behavior:

Thread-reply messages should show a quoted preview of the parent message they're replying to (as Message/index.tsx is designed to render via threadMsg).

Actual behavior:

Thread replies render as plain, unannotated messages - no parent-message preview - because normalizeMessages() never filters/annotates the message array as intended.

Proposed fix:

export const normalizeMessages = async (messages: any[] = []): Promise<any[]> => {
	const normalized = await Promise.all(messages.map(normalizeMessage));
	return normalized.filter(Boolean);
};

This preserves normalizeMessage's existing contract (return null/falsy to drop a message) and needs no changes to callers (packages/livechat/src/lib/room.ts:256,290).

Server version:

N/A - client-side bug in the @rocket.chat/livechat widget package, reproducible on current develop.

Start in packages/livechat/src/lib/threads.ts by reading normalizeMessage and normalizeMessages, then check their callers in packages/livechat/src/lib/room.ts at lines 256 and 290. Confirm the normalized result preserves intended filtering and threadMsg data, and verify that Message/index.tsx renders quoted parent context for thread replies.