Add Deno CI workflow for linting and testing

[thomaslovaslokoy-ui]

Summary

This PR adds a GitHub Actions workflow to automatically run Deno linting and tests on every push to main and pull request.

Key Changes

• Added .github/workflows/deno.yml workflow file that:
  • Runs on pushes and pull requests to the main branch
  • Sets up Deno v1.x runtime environment
  • Executes deno lint to check code style and quality
  • Executes deno test -A to run the test suite with all permissions
  • Uses the pinned version of denoland/setup-deno@v1.1.2 for reproducibility

Notable Details

• The workflow includes a commented-out step for deno fmt --check that can be enabled to enforce code formatting
• Minimal permissions are set (read-only access to repository contents)
• Runs on Ubuntu latest for consistency

https://claude.ai/code/session_01Rh6dNYe4PcLk19k5bS3nB9