Chore/internal improvements

[Sharmaz]

Changes:

• Fix Prettier and ESLint indentation conflict —
  aligned both to 2 spaces
• Upgrade ESLint to v10 and @eslint/js to v10,
  update Node engine to >=20.19.0
• Add Airbnb-style ESLint rules (formatting,
  best practices, ES6+)
• Add early returns in initialize.js to prevent
  execution after validation errors
• Add try/catch error handling and { recursive:
  true } to templateCopy.js
• Extract resolveAndInitialize() in index.js to
  remove duplicated template path logic
• Add npm dependency caching (cache: 'npm') and
  upgrade to Node 24 in all GitHub Actions
  workflows
• Replace npm install with npm ci in CI
  workflows
• Update publish.yml to use OIDC Trusted
  Publishing with --provenance flag
• Fix template package names to match directory
  names (react-ts → react-typescript,
  react-ts-tw-lint-test → react-dev-typescript,
  minimal-react-webpack → react-webpack)
• Standardize TypeScript version to ^5.8.3
  across templates
• Standardize Babel dependencies to ^7.26.10
  across templates
• Standardize ESLint to ^9.26.0 across templates
• Add missing @babel/preset-env to react-webpack
  template .babelrc and package.json
• Remove duplicate TypeScript check (unreachable
  code) in colors.js
• Remove unused react-experimental template
• Add explicit test and expect imports from
  @jest/globals in test files
• Add unit tests for colors.js (separator,
  setColor, setUnderlineOff)
• Add unit tests for templateList.js
  (categories, subcategories, template values)
• Add unit test for invalid template path in
  initialize.js
• Add unit test for error handling in
  templateCopy.js
• Add unit test for missing package.json in
  templateRenameName.js