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Tech overview

• Next.js App Router with a client component for interactive state.
• TanStack Query handles fetch, cache, and loading/error states.
• Keyed caching via ['pokemon', id] prevents duplicate requests.
• Local id state selects the Pokémon; updates trigger refetch.
• UI: PokemonCard renders data; ButtonGroup increments/decrements id.
• Styling with styled-components for scoped, themeable styles.