fix: Stabilized lint GitHub Action and fixed some minor issues

[nplhse]

Summary

• Fixed issues in the existing lint GitHub Action configuration
• Adjusted workflow setup to ensure linting runs reliably in CI
• Resolved configuration and execution problems causing failing or unstable checks
• Performed minor cleanups related to the CI setup

Motivation

• Ensure a stable and reliable linting process in the CI pipeline
• Prevent false negatives or broken workflows during pull request checks
• Improve developer confidence by having consistent and predictable lint results
• Keep the CI configuration maintainable and aligned with current project structure

Notes for Reviewers

• Review the updated GitHub Action workflow configuration
• Verify that linting runs correctly on pull requests and main branch updates
• Ensure no other CI steps were unintentionally affected
• This PR focuses purely on tooling — no functional or domain logic changes

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.45%. Comparing base (9abf8d2) to head (b1371fe).
⚠️ Report is 10 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #40      +/-   ##
============================================
- Coverage     72.46%   72.45%   -0.01%     
  Complexity     2123     2123              
============================================
  Files           257      257              
  Lines          8737     8736       -1     
============================================
- Hits           6331     6330       -1     
  Misses         2406     2406              

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