Update Dependencies and Address Security Vulnerabilities

[colton123e]

This PR updates project dependencies and regenerates package-lock.json to address reported vulnerabilities.

Key Changes

• Ran npm audit fix to apply non-breaking security patches where available.
• Cleaned up and reinstalled dependencies to ensure consistency with updated lockfile.
• Verified project builds and runs locally after updates.

Why

• Prior package-lock.json contained packages with moderate to high severity vulnerabilities (including nth-check, postcss, and webpack-dev-server).
• These updates improve project security and maintainability, preparing the repo for future Node/npm compatibility.

Notes

• xlsx library still reports advisories (GHSA-4r6h-8v6p-xvw6 and GHSA-5pgg-2g8v-p4x9) with no fix currently available. This remains as a known limitation upstream.
• Some transitive dependencies may still show deprecation warnings but do not block builds or functionality.
• Major upgrades (e.g., react-scripts) were not force-installed to avoid introducing breaking changes; this PR sticks to safe updates only.