Debug: Component Renders Twice on Every Update

Challenge summary

Explain StrictMode double-invocation, idempotent effects, and testing for unintended side effects; use profiling for performance.

What you'll practice

• Keep the UI structure and existing styles.
• Clicking "Increment" should increase the count by 1.
• The parity label must remain correct (even/odd).
• A single click should result in only one additional render (render count increases by 1).
• Count increases by 1 when Increment is clicked.

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