fix: apply ruff formatting to sheets formatting feature

Fixed formatting issues in:
- gcalendar/calendar_tools.py
- gsheets/sheets_tools.py
- tests/gsheets/test_format_sheet_range.py

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

tests/gsheets/test_format_sheet_range.py

@@ -19,9 +19,7 @@ def create_mock_service():
     """Create a properly configured mock Google Sheets service."""
     mock_service = Mock()
 
-    mock_metadata = {
-        "sheets": [{"properties": {"sheetId": 0, "title": "Sheet1"}}]
-    }
+    mock_metadata = {"sheets": [{"properties": {"sheetId": 0, "title": "Sheet1"}}]}
     mock_service.spreadsheets().get().execute = Mock(return_value=mock_metadata)
     mock_service.spreadsheets().batchUpdate().execute = Mock(return_value={})