Fix linting issues: remove trailing whitespace and organize imports

- Remove trailing whitespace from azure.py line 93
- Fix whitespace in notebook_magic.py docstring comments
- Reorganize imports in test_widget_fixes.py to comply with flake8

All checks now pass:
- flake8: 0 issues
- pytest: 312/312 tests passing
- mypy: 0 issues

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

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

Author: jeremymanning

clustrix/cloud_providers/azure.py

@@ -90,7 +90,6 @@ def authenticate(self, **credentials) -> bool:
             assert isinstance(client_id, str)
             assert isinstance(client_secret, str)
             assert isinstance(subscription_id, str)
-            
             self.credential = ClientSecretCredential(
                 tenant_id=tenant_id, client_id=client_id, client_secret=client_secret
             )

clustrix/notebook_magic.py

@@ -187,7 +187,7 @@ class widgets:  # type: ignore
 logger = logging.getLogger(__name__)
 
 #: Default cluster configurations available in the widget.
-#: 
+#:
 #: This dictionary contains pre-configured cluster templates for common use cases.
 #: Each configuration is a dictionary with cluster-specific settings.
 DEFAULT_CONFIGS = {
@@ -2367,13 +2367,13 @@ class ClusterfyMagics(Magics):
     def clusterfy(self, line, cell):
         """
         Create an interactive widget for managing Clustrix configurations.
-        
+
         Usage::
-        
+
             %%clusterfy
-            
+
         This creates a widget interface that allows you to:
-        
+
         - Select and manage cluster configurations
         - Create new configurations with validation
         - Save/load configurations from files

tests/test_widget_fixes.py

@@ -2,13 +2,17 @@
 Test suite for widget configuration fixes addressing issue #53.
 """
 
-import pytest
 import importlib
+
 import clustrix.notebook_magic
+from clustrix.config import ClusterConfig
 
+# Reload to ensure fresh state
 importlib.reload(clustrix.notebook_magic)
-from clustrix.notebook_magic import DEFAULT_CONFIGS, ClusterConfigWidget
-from clustrix.config import ClusterConfig
+
+# Import after reload to get the refreshed module
+DEFAULT_CONFIGS = clustrix.notebook_magic.DEFAULT_CONFIGS
+ClusterConfigWidget = clustrix.notebook_magic.ClusterConfigWidget
 
 
 class TestWidgetConfigurationFixes: