style: unify code formatting and import order

- Remove trailing whitespace and normalize blank lines
- Unify string quotes and line breaks for long lines
- Sort imports alphabetically across modules

nanobot/utils/helpers.py

@@ -1,8 +1,8 @@
 """Utility functions for nanobot."""
 
 import re
-from pathlib import Path
 from datetime import datetime
+from pathlib import Path
 
 
 def ensure_dir(path: Path) -> Path: