feat(ui): add Curriculum course layout component

[bntvllnt]

Summary

• add a new Curriculum component family for structured course and syllabus layouts
• ship collapsible modules, lesson status/difficulty/duration badges, prerequisite hints, and auto-calculated module progress
• add Storybook, unit coverage, and Playwright component snapshots for the new educational layout

Validation

• pnpm -F @vllnt/ui exec eslint src/components/index.ts src/components/curriculum/index.ts src/components/curriculum/curriculum.tsx src/components/curriculum/curriculum.test.tsx --max-warnings 0 --no-warn-ignored
• pnpm -F @vllnt/ui exec vitest run src/components/curriculum/curriculum.test.tsx
• pnpm -F @vllnt/ui exec tsx scripts/verify-stories.ts
• pnpm -F @vllnt/ui exec playwright test -c playwright-ct.config.ts src/components/curriculum/curriculum.visual.tsx --update-snapshots
• pnpm -F @vllnt/ui build

Closes #20

[vercel]

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Project	Deployment	Actions	Updated (UTC)
storybook	Ready	Preview, Comment	Apr 25, 2026 8:30am
ui.vllnt.ai	Ready	Preview, Comment	Apr 25, 2026 8:30am

[bntvllnt]

Auto-fix status — 2026-04-25

Current status: ready for final human review. Draft removed after fixing the SSR/first-paint progress blocker.

What I changed in this pass

• pushed 7691afd — fix(ui): compute curriculum progress during render
• replaced hydration-time lesson registration with render-time structural progress summarization so module counts/progress are correct on SSR and first paint
• added a server-render regression test to lock the first-render progress behavior

Blockers

• none

Validation summary

• ✅ pnpm -F @vllnt/ui exec eslint src/components/curriculum/curriculum.tsx src/components/curriculum/curriculum.test.tsx --max-warnings 0
• ✅ pnpm -F @vllnt/ui exec vitest run src/components/curriculum/curriculum.test.tsx
• ✅ pnpm -F @vllnt/ui exec tsx scripts/verify-stories.ts
• ✅ pnpm -F @vllnt/ui exec playwright test -c playwright-ct.config.ts src/components/curriculum/curriculum.visual.tsx
• ✅ pnpm -F @vllnt/ui exec tsc --noEmit --project tsconfig.build.json
• ✅ pnpm -F @vllnt/ui build
• ✅ pnpm -F @vllnt/ui test:once
• ⚠️ pnpm -F @vllnt/ui test:visual is not currently authoritative from this review worktree because Playwright generated many missing baseline snapshots outside the curriculum scope; the targeted curriculum visual test above passed.

Claude review result

• No blocking findings on the live diff vs feat/storybook.
• Non-blocking warns only: dead CurriculumLesson.id prop, redundant hidden + aria-hidden, non-semantic div aria-label, fixed h2 heading level, and a mostly-dead useMemo(children) optimization.

Codex review result

• Unavailable in this run: OPENAI_API_KEY is unset, so Codex CLI review was intentionally skipped.

Action for bntvllnt

• Final human review + merge decision only. The SSR progress blocker is fixed and this PR is ready for manual review.