Return the most recent image posted in the configured Telegram group.

Use this when the user says they have just sent a screenshot. It looks back over the last 200 messages for one carrying a photo and returns it together with the path to the full-resolution original — crop that file if you need to read fine print the downscaled copy blurred.

Returns a sentence explaining what to fix if the group is unreachable, the session has expired, or no photo is in range.

Blocks until a new image is posted to the group, then returns it.

Use this when the user is about to send a screenshot. It notes the group's newest message when the call starts and returns the first photo after that, so it never hands back something you have already seen in this call.

Args: timeout_seconds: how long to wait, clamped to 1-240 seconds.

Waiting costs no tokens -- the process idles on a socket. If nothing arrives it returns a sentence saying so; call it again to keep waiting.