⚡ Bolt: Replace JSON.parse(JSON.stringify) with structuredClone

[ralksta]

💡 What: Replaced JSON.parse(JSON.stringify) with native structuredClone for deep copying settings objects in app/admin/components/SettingsEditor.tsx.
🎯 Why: JSON.parse(JSON.stringify) is significantly slower due to string serialization and deserialization overhead.
📊 Impact: Reduces CPU time and memory allocation during state updates and save operations, leading to a faster and more responsive settings editor UI.
🔬 Measurement: Profile the 'update' and 'handleSave' function execution times; structuredClone will show measurable reduction in deep cloning overhead.

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PR created automatically by Jules for task 2134698750337809734 started by @ralksta

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