ci: add Biome + Vitest + git-hook quality gates - #20

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/

This variable implicitly has the any type.

This variable implicitly has the any type.

This variable implicitly has the any type.

This variable implicitly has the any type.

This variable implicitly has the any type.

Change to an optional chain.

Change to an optional chain.

Forbidden non-null assertion.

Forbidden non-null assertion.

Alternative text title element cannot be empty

Useless case clause.

Template literals are preferred over string concatenation.

Template literals are preferred over string concatenation.

Template literals are preferred over string concatenation.

Template literals are preferred over string concatenation.

Template literals are preferred over string concatenation.

Template literals are preferred over string concatenation.

Template literals are preferred over string concatenation.

Template literals are preferred over string concatenation.