fix(deps): upgrade webpack-cli to v6

[Copilot]

This updates the project to webpack-cli v6 while preserving the existing webpack 5 build workflow. The dependency graph is refreshed to align CLI internals with the new major.

• Dependency update

  • Bumped webpack-cli in devDependencies from ^5.1.4 to ^6.0.1.

• Lockfile refresh

  • Regenerated npm lock entries for webpack-cli and related @webpack-cli/* packages to resolve against v6.

• Build compatibility

  • Kept existing webpack config usage and npm scripts unchanged so current production build entrypoints continue to work with the upgraded CLI.

// package.json
"devDependencies": {
  "webpack": "^5.106.2",
  "webpack-cli": "^6.0.1"
}