Updated the playground to support Langium 4.1

[emilkrebs]

No description provided.

[github-actions]

PR Preview Action v1.6.1
🚀 View preview at https://eclipse-langium.github.io/langium-previews/pr-previews/pr-288/
Built to branch previews at 2025-11-28 09:59 UTC. Preview will be ready when the GitHub Pages deployment is complete.

[spoenemann]

There's an error (https://eclipse-langium.github.io/langium-previews/pr-previews/pr-288/playground/):

userServerWorker.js:25956 Uncaught (in promise) Error: The service registry contains no services for the extension '.0' for language '0'.
    at DefaultServiceRegistry.getServices (https://eclipse-langium.github.io/langium-previews/pr-previews/pr-288/playground/libs/worker/userServerWorker.js:25956:17)
    at DefaultLangiumDocumentFactory.parseAsync (https://eclipse-langium.github.io/langium-previews/pr-previews/pr-288/playground/libs/worker/userServerWorker.js:24609:45)
    at DefaultLangiumDocumentFactory.update (https://eclipse-langium.github.io/langium-previews/pr-previews/pr-288/playground/libs/worker/userServerWorker.js:24598:43)
    at https://eclipse-langium.github.io/langium-previews/pr-previews/pr-288/playground/libs/worker/userServerWorker.js:27930:115
    at DefaultDocumentBuilder.runCancelable (https://eclipse-langium.github.io/langium-previews/pr-previews/pr-288/playground/libs/worker/userServerWorker.js:27984:17)
    at async DefaultDocumentBuilder.buildDocuments (https://eclipse-langium.github.io/langium-previews/pr-previews/pr-288/playground/libs/worker/userServerWorker.js:27930:7)
    at async DefaultDocumentBuilder.update (https://eclipse-langium.github.io/langium-previews/pr-previews/pr-288/playground/libs/worker/userServerWorker.js:27828:7)
    at async https://eclipse-langium.github.io/langium-previews/pr-previews/pr-288/playground/libs/worker/userServerWorker.js:28251:26
    at async Promise.all (index 0)
    at async DefaultWorkspaceLock.performNextOperation (https://eclipse-langium.github.io/langium-previews/pr-previews/pr-288/playground/libs/worker/userServerWorker.js:28249:7)

[spoenemann]

Thanks!