Upgrade Next and React stack

[krutilin]

Summary

• Upgrade the app stack to Next.js 16, React 19, ESLint 9, react-dropzone 15, and qrart-lib 2.
• Replace the removed next lint command with ESLint flat config and eslint ..
• Keep production builds on webpack via next build --webpack to avoid a Turbopack NFT tracing warning in the API route.
• Add dependency overrides for transitive postcss and uuid advisories.

Validation

• npm ci
• npm run build
• npm run lint (passes with existing warnings for <img> and font loading)
• npm audit --omit=dev => 0 vulnerabilities
• Smoke-tested /api/generate locally for static JPEG and animated GIF responses.

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Project	Deployment	Actions	Updated (UTC)
qrart	Ready	Preview, Comment	Jul 9, 2026 11:23pm