ci: switch npm publish workflow to staged publishing

[andrii-bodnar]

Switched the npm release workflow to staged publishing (npm stage publish). This adds an approval gate before a version becomes installable, reducing supply-chain risk while keeping our CI release flow unchanged otherwise.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.13%. Comparing base (4864e8c) to head (60e4256).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #667   +/-   ##
=======================================
  Coverage   90.13%   90.13%           
=======================================
  Files          41       41           
  Lines        2188     2188           
  Branches      256      256           
=======================================
  Hits         1972     1972           
  Misses         82       82           
  Partials      134      134           

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