ci: add Biome + Vitest + git-hook quality gates - #3

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-node@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Avoid using the index of an array as key property in an element.

Provide an explicit type prop for the button element.

Provide an explicit type prop for the button element.

Forbidden non-null assertion.

This hook specifies more dependencies than necessary: pathname.

Template literals are preferred over string concatenation.

Template literals are preferred over string concatenation.