moved from textual to nicegui

desktop_app/api/message.py

@@ -1,6 +1,14 @@
 from api.node import MeshNode
+from datetime import datetime
 
 class Message:
-    def __init__(self, content: str, sender: MeshNode):
+    def __init__(self, content: str, sender: MeshNode, timestamp=None):
         self.content = content
-        self.sender = sender
+        self.sender = sender
+        self.timestamp = timestamp or "now"
+        
+    def __str__(self):
+        return f"{self.sender.name}: {self.content}"
+    
+    def __repr__(self):
+        return f"Message(content={self.content}, sender={self.sender})"