New Document Editor + Yjs type #998

[Polleps]

Related Issues

relates to #998
closes #720, closes #1111, closes #741

Checklist

• Add changelog entry linking to issue, describe API changes
• Add or update tests if needed
• Update docs if needed

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@cursor review

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PR Summary

Adds Yjs/YDoc support with commit-based updates and live WebSocket syncing, updates React/Svelte/CLI, and documents/indexes new document content.

• Core/Lib:
  • Add Datatype.YDoc with parse/serialize (base64) and value handling; expose URLs (ydoc, yUpdate, documentContent).
  • Extend Commit with yUpdate field and apply/serialize logic (merge Y updates); update defaults and URLs.
  • Add yrs dependency.
• Server:
  • Introduce Y-sync broadcaster actor and messages (SubscribeYSync, UnsubscribeYSync, YSyncUpdate).
  • Extend WS handler with Y_SYNC_SUBSCRIBE/UNSUBSCRIBE and Y_SYNC_UPDATE; plumb through AppState.
• Search:
  • Index DocumentV2 content by decoding YDoc state and extracting plain text for description.
• React lib:
  • Improve useResource/useResources performance and tracking; add UseResourceOptions.track.
  • Add useYDoc(resource, propertyURL) hook; refactor saves to __internalObject.
  • Revamp useServerSearch to call store.search directly with debounce; add useOnValueChange helper.
  • Bump React to ^19.2.0, types/TS versions; add yjs devDep; enhance lint scripts.
• Svelte:
  • getResource store now updates on LoadingChange; add lint script tweaks.
• CLI:
  • Add base64 dep; prompt/validate YDoc (base64) for new resources.
• Docs:
  • Document YDoc datatype, commit yUpdate, agent secrets/advanced usage, and Yjs docs usage in JS lib.

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Bug: Top-Level Await Disrupts System Initialization

Top-level await enableYjs() call makes the module async, causing potential issues with React and build tool initialization. This should be called within a React effect or effect hook instead, or handled during store initialization within the App component.