chore: fix npm audit security vulnerabilities (#184)

* Initial plan

* chore: run npm audit fix to resolve non-breaking security vulnerabilities

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* chore: add overrides to fix diff and serialize-javascript vulnerabilities

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* chore: revert package.json overrides, keep only npm audit fix changes

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* chore: revert lockfile to base branch and re-run npm audit fix

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Author: Copilot