Configure eslint to ignore CDN imports in demo files

[Copilot]

The import-x/no-unresolved rule was failing on demo files that import from CDN URLs (esm.sh, unpkg.com), which cannot be resolved by the linter's module resolution.

Changes

• Add eslint config override for demo/**/*.html files to ignore HTTPS URLs in the import-x/no-unresolved rule
• Maintains strict import checking for source code while allowing external CDN references in demos

{
  files: ['demo/**/*.html'],
  rules: {
    'import-x/no-unresolved': [
      'error',
      {
        ignore: ['^https://'],
      },
    ],
  },
}

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• example.com
  • Triggering command: /usr/local/bin/node /usr/local/bin/node --conditions node --conditions development --experimental-import-meta-resolve --require /home/REDACTED/work/fullscreen-control/fullscreen-control/node_modules/vitest/suppress-warnings.cjs /home/REDACTED/work/fullscreen-control/fullscreen-control/node_modules/vitest/dist/workers/forks.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[BUG] linter issue</issue_title>
<issue_description>## Description

/home/runner/work/fullscreen-control/fullscreen-control/demo/esm.html
Error:   40:45  error  Unable to resolve path to module 'https://esm.sh/@aarongustafson/fullscreen-control@2.0.0/fullscreen-control.js?bundle&target=es2022'  import-x/no-unresolved

/home/runner/work/fullscreen-control/fullscreen-control/demo/unpkg.html
Error:   52:44  error  Unable to resolve path to module 'https://unpkg.com/@aarongustafson/fullscreen-control@latest/define.js?module'  import-x/no-unresolved

✖ 2 problems (2 errors, 0 warnings)
```</issue_description>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes [BUG] linter issue #1

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