perf(polaroid): optimize rendering and dragging performance #398
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- Memoize `PolaroidCard` component using `React.memo` to prevent unnecessary re-renders when updating z-index. - Refactor `handleCardClick` with `useCallback` and `useRef` to maintain stable function references and avoid child component updates.
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PolaroidCardcomponent usingReact.memoto prevent unnecessary re-renders when updating z-index.handleCardClickwithuseCallbackanduseRefto maintain stable function references and avoid child component updates.