upgrade nodejs version

[sensuikan1973]

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[gemini-code-assist]

Code Review

This pull request appears to be an automated attempt to upgrade the Node.js version used in the project. However, the target version 25.8.0 specified in .node-version is not a valid Node.js version. This is a critical issue that would cause environment setup to fail. I have added a review comment to correct this to a valid Long-Term Support (LTS) version of Node.js.

[gemini-code-assist]

The specified Node.js version 25.8.0 is invalid. Official Node.js releases have not reached version 25, with the current LTS line being 20.x. This invalid version will likely cause failures in any environment setup (local or CI) that relies on this file. Please use a valid Node.js version. It is recommended to use a version from the current LTS line.

20.15.0

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.13%. Comparing base (5b4d362) to head (5ed6839).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2875   +/-   ##
=======================================
  Coverage   94.13%   94.13%           
=======================================
  Files          52       52           
  Lines        1483     1483           
=======================================
  Hits         1396     1396           
  Misses         87       87           

Flag	Coverage Δ
integration_test	65.00% <ø> (ø)
macos-latest	93.05% <ø> (ø)
ubuntu	93.59% <ø> (ø)
widget_test	90.28% <ø> (+0.06%)	⬆️
windows	93.45% <ø> (ø)

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