Function getLatestMessageMeta

getLatestMessageMeta(
chat_id: string,
): Promise<null | { ts_seconds: number; message_id: string }>
Gets metadata about the most recent message in a specific chat.

This function is used to determine the latest message timestamp and ID for a chat, which is useful for:
- Setting up relative time filters (e.g., "last N days")
- Determining the end boundary for import ranges
- Validating cursor positions
Parameters
- chat_id: string
  The chat ID to get the latest message for
Returns Promise<null | { ts_seconds: number; message_id: string }>
Promise resolving to message metadata or null if no messages exist
Example
```
const latest = await getLatestMessageMeta("19175769740@s.whatsapp.net");
if (latest) {
  console.log(`Latest message: ${latest.message_id} at ${new Date(latest.ts_seconds * 1000)}`);
}
```
- Defined in evolution/reader.ts:146