Private chat pannel .gd need to fix time format

[Feipian]

		var time_text = ""
		if timestamp != "":
			# Extract time from ISO format (2026-03-07T12:34:56Z)
			var time_parts = timestamp.split("T")
			if time_parts.size() > 1:
				time_text = time_parts[1].split(".")[0]  # Get HH:MM:SS
		
		# Create message bubble
		var bubble = message_bubble_scene.instantiate()
		bubble.setup_message(content, time_text, is_from_you)
		message_container.add_child(bubble)
	```

<img width="1920" height="1020" alt="Image" src="https://github.com/user-attachments/assets/3806c7f6-bb45-4d3c-9852-fa6d88c146b9" />