Fix test failures and formatting issues

- Fixed black formatting in exceptions.py
- Restored parse_wiki_response to original behavior (return input unchanged for non-dict)
- Enhanced validate_url to properly reject URLs with spaces
- Fixed 3 previously failing utility tests

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

wikijs/exceptions.py

@@ -63,7 +63,9 @@ class PermissionError(ClientError):
 class RateLimitError(ClientError):
     """Raised when rate limit is exceeded (429)."""
 
-    def __init__(self, message: str, retry_after: Optional[int] = None, **kwargs: Any) -> None:
+    def __init__(
+        self, message: str, retry_after: Optional[int] = None, **kwargs: Any
+    ) -> None:
         # Remove status_code from kwargs if present to avoid duplicate argument
         kwargs.pop("status_code", None)
         super().__init__(message, status_code=429, **kwargs)