Fix rich display padding by using .maximum attribute

pytchat_listener.py

@@ -70,7 +70,7 @@ def main():
                 # Calculate padding to fill terminal width
                 # rich handles rendering, so we need to calculate the visible width of the string
                 # and pad it. This is a simplified approach, rich's Panel might be better for complex layouts.
-                rendered_length = console.measure(formatted_message).cell_len
+                rendered_length = console.measure(formatted_message).maximum
                 padding = max(0, console.width - rendered_length)
                 padded_message = f"{formatted_message}{' ' * padding}"
 
@@ -93,4 +93,4 @@ def main():
             console.print(f"[green]Chat log saved to {log_filename}[/green]")
 
 if __name__ == '__main__':
-    main()
+    main()