Add ESLint workflow

[aegilops]

Lint with ESLint

[Copilot]

Pull Request Overview

A pull request to add an ESLint GitHub Actions workflow to run linting on JavaScript/TypeScript code.

• Introduces a new workflow file: .github/workflows/eslint.yml
• Sets up job steps for checking out code, installing dependencies, running ESLint, and uploading SARIF results
• Configures triggering on push, pull_request, and a scheduled cron job

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[github-advanced-security]

This pull request sets up GitHub code scanning for this repository. Once the scans have completed and the checks have passed, the analysis results for this pull request branch will appear on this overview. Once you merge this pull request, the 'Security' tab will show more code scanning analysis results (for example, for the default branch). Depending on your configuration and choice of analysis tool, future pull requests will be annotated with code scanning analysis results. For more information about GitHub code scanning, check out the documentation.