feat(v2.1): update format

[ruicore]

Summary

• Describe the user-facing or engineering goal of this change.

Changes

• List the most important implementation changes.

Validation

• uv run ruff format --check .
• uv run ruff check .
• uv run pyright
• uv run pytest --cov=excelalchemy --cov-report=term-missing:skip-covered tests

Checklist

• I updated documentation when behavior or workflows changed.
• I did not include generated files or local-only artifacts.
• I confirmed this change does not require additional release steps.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.27%. Comparing base (a89e4c9) to head (64b7081).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #55      +/-   ##
==========================================
+ Coverage   86.24%   86.27%   +0.03%     
==========================================
  Files          48       48              
  Lines        3220     3220              
  Branches      370      370              
==========================================
+ Hits         2777     2778       +1     
+ Misses        276      275       -1     
  Partials      167      167              

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