- next 14.2 -> 16.2, react/react-dom 18 -> 19, eslint 8 -> 9,
typescript-eslint 6 -> 8, typescript 5.3 -> 5.7, @types/react* -> 19
- remove i18n config from next.config.js (unsupported in App Router; it
forced a pages-router _document and broke the 404 prerender)
- Next 16 reconfigured tsconfig (moduleResolution bundler, jsx react-jsx)
Build, unit tests, and e2e all green on the new stack.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>