style(oauth_setup): clean up whitespace and formatting in _sanitize_input

Author: njoshi-conga

src/mcp_atlassian/utils/oauth_setup.py

@@ -39,13 +39,11 @@ def _sanitize_input(user_input: str) -> str:
     """
     if not user_input:
         return user_input
-    
     # Remove leading/trailing whitespace and various line endings
     # Handle Windows (\r\n), Unix (\n), and Mac (\r) line endings
     sanitized = user_input.strip().rstrip('\r\n').strip()
     return sanitized
 
-
 class CallbackHandler(http.server.BaseHTTPRequestHandler):
     """HTTP request handler for OAuth callback."""