fix: fully regenerate package-lock.json from a clean install

The prior lock file fix was based on an incremental npm install over stale node_modules, which didn't fully re-resolve the dependency tree and still left npm ci failing in CI on optional platform packages (@emnapi/*). A full clean install (removing node_modules first) produces a lock file that matches what npm ci expects.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: Michael Behrisch