Move large JSON processing into a Web Worker

[shubhamashish33]

Summary

• Moves large JSON parsing, text indexing, search, and comparison into a Web Worker.
• Adds progress/cancel state for long worker tasks and a timeout fallback so the editor does not stay blank if worker processing fails.
• Keeps structured edit actions on the main thread while preserving undo/redo for supported small-document workflows.
• Optimizes tree rendering so large objects do not need every key expanded just to render the first visible page.
• Documents the worker-backed large JSON architecture in the README.

Verification

• npm run build
• npm test -- --watchAll=false src/jsonUtils.test.js

Notes

• Worker processing improves responsiveness but does not remove browser memory limits for parsed JSON.
• Undo/redo still avoids full snapshots for very large documents to prevent memory growth.

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Project	Deployment	Actions	Updated (UTC)
json-comparator	Ready	Preview, Comment	May 16, 2026 6:54pm