openwisp / netjsongraph.js / 21152027594 / 1

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[fix] Replaced JSON.parse(JSON.stringify()) with structuredClone

- Add fastDeepCopy utility to NetJSONGraphUtil class using structuredClone with JSON fallback
- Update netjsongraph.render.js (6 instances), netjsongraph.core.js (1 instance), and netjsonWorker.js (2 instances) to use fastDeepCopy
- Update test mocks in netjsongraph.render.test.js to include fastDeepCopy
- Improves performance for large NetJSON datasets by reducing deep copy overhead

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