Several files fail `npx prettier --check .` (among them the navbar files, App.tsx, App.test.tsx and docs/AI_USAGE.md), so the code style is not the same everywhere. Code quality is assessed in this round. ### What to do Run `npm run format` on dev in one pull request with nothing else in it, so it is easy to review. ### Done when - [ ] `npx prettier --check .` passes on main.