refactor: clean up code and improve variable naming

- Removed unnecessary blank lines in cx_setup.py.
- Reformatted conditional checks in meshchat.py for better readability.
- Updated callback variable names in NomadnetDownloader for clarity.
- Adjusted version string formatting in version.py for consistency.
- Reordered import statements in prepare_frontend_dir.py for better organization.

cx_setup.py

@@ -45,4 +45,3 @@ setup(
         },
     },
 )
-