refactor(backend): quitar los any restantes y hacer no-explicit-any error - #10

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/

The 'rows' logical expression could make the dependencies of useCallback Hook (at line 467) change on every render. To fix this, wrap the initialization of 'rows' in its own useMemo() Hook