Refactor: Remove deprecated dependencies and improve code quality

[Copilot]

Comprehensive codebase cleanup addressing deprecated dependencies, type safety, and code consistency.

Dependency Cleanup

• Removed babel-polyfill (obsolete for Node.js ≥12)
• Removed babel 6.x, @types/request, @rollup/plugin-commonjs (unused)
• Updated package.json scripts from pnpm to npm

Type Safety

• Fixed StatType: Date → string (matches actual API response)
• Replaced any with proper types in NpmException (string, number, unknown)
• Eliminated redundant property initialization in exception constructor

Code Style

• Removed redundant ternary: pkg ? pkg : "" → pkg
• Applied ES6 shorthand: { statusCode: statusCode } → { statusCode }
• Formatted with prettier, removed deprecated jsxBracketSameLine option

Configuration

• Set explicit babelHelpers: 'bundled' in rollup config (eliminates warning)
• Removed deprecated husky/ava configs from package.json
• Updated husky pre-push hook for npm compatibility

Bug Fixes

• Corrected error message in app.js: "details method" → "stat method"

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• api.npmjs.org
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node node app.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Requesting a review and refactoring of the repository's codebase to identify areas for improvement or correction. This entails analyzing the code for potential enhancements in efficiency, readability, maintainability, and functionality.

This pull request was created from Copilot chat.

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