chore: Next.js dev performance tuning and code cleanup

[Copilot]

Reduces dev server CPU/memory overhead and improves runtime render efficiency, alongside Tailwind and formatting hygiene.

Performance

• Turbopack: Enabled via next.config.ts — replaces Webpack in dev, significantly faster HMR and cold builds
• onDemandEntries: Caps in-memory page buffer (pagesBufferLength: 5, maxInactiveAge: 60s) to reduce idle memory pressure during dev
• Toggle memoization: Wrapped with React.memo to skip re-renders on unchanged props
• Font: Added display: "swap" to JetBrains Mono for better LCP/CLS; preload: true made explicit

Code quality

• Replaced inline style={{ width/height }} props in page.tsx with Tailwind utilities (h-10, h-12, w-[70px], etc.)
• Biome-compliant reformats across BadgeStatus.tsx, examples/page.tsx, layout.tsx, and page.tsx
• Updated pnpm-lock.yaml for dependency bumps

// next.config.ts
const nextConfig: NextConfig = {
  onDemandEntries: { maxInactiveAge: 60 * 1000, pagesBufferLength: 5 },
  turbopack: { resolveAlias: {} },
}

Note: onDemandEntries was deprecated in Next.js 15 and may be a no-op at ^16.1.6.

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