⚡ Bolt: Hoist pure functions in UserManagement

[kourdroid]

💡 What:
Hoisted getInitials and getAvatarColor pure helper functions outside the UserManagement component body in app/(admin)/users.tsx.

🎯 Why:
These functions were previously defined inside the component body, meaning new function references were being allocated on every single render of the UserManagement component. Since they are pure functions that don't depend on component props or state, they can safely live outside the component.

📊 Impact:
Slightly reduces memory pressure and garbage collection overhead by eliminating unnecessary function allocations during re-renders, especially noticeable on lower-end devices when interacting with the modals or lists.

🔬 Measurement:
To verify, you can add a console.log inside the functions to see when they are invoked, and verify the memory footprint in React DevTools stays flat across re-renders compared to the previous implementation.

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PR created automatically by Jules for task 12820196541376649868 started by @kourdroid

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