Add NodeJS version

[ozovalihasan]

Description

Currently, it is allowed to use different NodeJS versions to build docker container and run locally.

It is causing incompatibilities like this. So,

• engines key to package.json to compare versions of used and expected NodeJS
• .node-version file is added to detect node version by asdf
• Changes of sass version is reverted because this issue is raised with specific versions of NodeJS(22.0.0 and 20.0.0), but this issue is not raised with v24.14.1

Related Issue

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Type of Change

• 📦 Dependency & security updates
• 🔧 Bug fix (non-breaking change which fixes an issue)
• 🥂 Improvement (non-breaking change which improves an existing feature)
• 🚀 New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to change)
• 🔐 Security fix
• 📚 Examples / documentation / tutorials

Checklist

• I've written tests (if applicable) for all new methods and classes that I created. (rake test)
  -- Not necessary
• I've added documentation as necessary so users can easily use and understand this feature/fix.
  -- Not necessary

[Copilot]

Pull request overview

This PR aims to standardize the Node.js version used in this repo to reduce build incompatibilities across local development, Docker builds, and CI.

Changes:

• Adds a Node.js version pin via package.json engines and a new .node-version file.
• Reverts the previous sass pin by changing it to a semver range, which updates yarn.lock to newer Sass/transitive dependencies.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 2 comments.

File	Description
package.json	Adds engines.node and loosens the sass dependency constraint.
.node-version	Introduces a single source-of-truth Node version for tooling that reads this file.
yarn.lock	Updates locked dependency versions due to the sass range change (including Sass and its transitive deps).

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[ozovalihasan]

If there is an incompatibility, It is expected to update NodeJS version. So, this pinned version is added on purpose.