Fix linting issues after HuggingFace API endpoint change

- Apply black formatting to notebook_magic.py (trailing whitespace)
- Add noqa comments for intentionally unused imports in test_widget_fixes.py
- These imports are required for dependency availability checking

All quality checks now pass:
- mypy: ✅ No issues found in 26 source files
- pytest: ✅ 312/312 tests passing
- flake8: ✅ No linting errors
- documentation: ✅ Builds successfully

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

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

Author: jeremymanning

clustrix/notebook_magic.py

@@ -2091,7 +2091,7 @@ def _test_huggingface_connectivity(self, config):
             if not hf_token:
                 return False
 
-            # Test HuggingFace API connectivity using models endpoint 
+            # Test HuggingFace API connectivity using models endpoint
             # (whoami endpoint appears to have permission issues with some tokens)
             headers = {"Authorization": f"Bearer {hf_token}"}
             response = requests.get(
@@ -2110,13 +2110,17 @@ def _test_huggingface_connectivity(self, config):
             if response.status_code == 200:
                 # Successfully authenticated and can access models API
                 models = response.json()
-                
+
                 # Debug: Print successful connection info
                 if hasattr(self, "status_output"):
                     with self.status_output:
-                        print(f"🔍 Debug: Successfully retrieved {len(models)} model(s)")
+                        print(
+                            f"🔍 Debug: Successfully retrieved {len(models)} model(s)"
+                        )
                         if hf_username:
-                            print(f"🔍 Debug: Token validated for user: '{hf_username}'")
+                            print(
+                                f"🔍 Debug: Token validated for user: '{hf_username}'"
+                            )
 
                 return True
 

tests/test_widget_fixes.py

@@ -11,8 +11,8 @@
 
 # Check if widget dependencies are available
 try:
-    import IPython
-    import ipywidgets
+    import IPython  # noqa: F401
+    import ipywidgets  # noqa: F401
 
     WIDGET_DEPS_AVAILABLE = True
 except ImportError: