Feature/allow download embeded editor

[erseco]

This pull request introduces a remote fallback for the eXeLearning editor, allowing the module to function even if the editor is not built locally. If the local editor is missing, the system will load the editor assets remotely from https://app.exelearning.net/, ensuring a smoother experience for users who clone the repository directly. The documentation has also been updated to reflect these changes, and a new GitHub Action workflow has been added to provide PR playground previews.

Remote editor fallback and configuration:

• Updated src/Controller/EditorController.php and view/exelearning/editor-bootstrap.phtml to check for a local build of the editor and, if not present, load the editor remotely from https://app.exelearning.net/. The configuration and view now support both local and remote editor URLs, and the editor will function even if not built locally. [1] [2] [3] [4]

Documentation improvements:

• Revised the README.md to clarify that cloning without building the editor will now load assets remotely (requiring an internet connection), but for best performance, users should still use the official releases.

Developer workflow enhancements:

• Added a new GitHub Actions workflow (.github/workflows/pr-playground-preview.yml) that posts or updates a comment on pull requests with a link to try the PR branch in the Omeka-S Playground, improving testing and review workflows.

[github-actions]

omeka-s Playground Preview

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⚠️ The embedded eXeLearning editor is not included in this preview. You can install it from Modules > ExeLearning > Configure using the "Download & Install Editor" button. All other module features (ELPX upload, viewer, preview) work normally.