feat(quiz): add what-are-apps quiz

[myelinated-wackerow]

Summary

Adds a six-question beginner quiz for /what-are-apps, embedded at the bottom of the page and listed under Ethereum basics on /quizzes.

One question per page section: unstoppable apps, what running on a public blockchain buys you, the guarantee that replaces an intermediary, who owns your data, composability across apps, and a true/false busting "every Ethereum app is for trading tokens". Every question is answerable from the page alone, and each wrong answer corrects a specific misconception (redundant hosting equals decentralization, a central body approves apps, trustless means unprotected, the data-for-free-access bargain, interoperability needs a partnership, sign-in-with-a-provider).

The quiz title reuses the existing common:what-are-apps string, so no new title string is needed. No QUIZZES_PREFIXES entry is needed either: the use-cases layout already loads the learn-quizzes namespace. Translated copies of the page get the embed through the intl pipeline.

[netlify]

✅ Deploy Preview for ethereumorg ready!

Name	Link
🔨 Latest commit	953bd34
🔍 Latest deploy log	https://app.netlify.com/projects/ethereumorg/deploys/6a74cc9b97fa370008704a2a
😎 Deploy Preview	https://deploy-preview-18906.ethereum.it
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
Lighthouse	7 paths audited Performance: 59 (🟢 up 2 from production) Accessibility: 95 (no change from production) Best Practices: 100 (🟢 up 1 from production) SEO: 98 (no change from production) PWA: 60 (no change from production) View the detailed breakdown and full score reports
🤖 Make changes	Run an agent on this branch

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[github-actions]

🔎 First-pass review — ✅ Looks mergeable

Adds a six-question beginner quiz to /what-are-apps, embedded via <QuizWidget quizKey="what-are-apps" /> and listed under Ethereum basics on /quizzes. I verified every wiring claim in the description against the code and it all holds up — the data, string keys, and namespace loading are consistent with the existing quizzes. Lint/type-check and unit tests are green; Chromatic and the Netlify deploy are still running.

Analysis

Lane: code/data (+ English content). Files: quiz data (src/data/quizzes/index.ts, questionBank.ts), English strings (src/intl/en/learn-quizzes.json), the page embed (public/content/what-are-apps/index.md), and a Storybook fixture (QuizzesStats.stories.tsx).

Checked:

• Answer/explanation coverage — all referenced label + explanation keys exist. Questions without per-answer explanations rely on explanationOverrides, correctly:
  • Q2 ([1,1,1,4], correct = d "All of the above"): a/b/c map to -a-explanation ("correct, but there are also other correct answers"), d maps to its own. Only -a/-d explanations need to exist. ✓
  • Q6 ([1,1], true/false, correct = b "False"): both options map to -a-explanation. ✓ (questionBank.ts:200-211 confirms the exIdx = override - 1 mapping.)
• Title resolution — bare title: "what-are-apps" goes through tCommon() in useQuizWidget.tsx:63-65; common:what-are-apps = "What are apps?" exists. Reusing it is correct, no new string needed. ✓
• Namespace — LAYOUT_NAMESPACES["use-cases"] already includes learn-quizzes (translations.ts:139), and the page is template: use-cases, so no QUIZZES_PREFIXES entry is required. ✓
• CI — Lint/type-check & Unit tests passing; Chromatic + Netlify in progress.

Non-blocking: the embed line has no trailing newline, but that matches the file's prior state — nothing to fix.

Labels: removed translation 🌍 (no non-English files are touched — src/intl/en/ is English content); added needs review 👀.

Generated by PR Reviewer (team) for #18906 · 102.4 AIC · ⌖ 24.5 AIC · ⊞ 5.2K · ◷