Description

Consolidates tests.yml, lint-markdown.yml, chromatic.yml, chromatic-pages.yml, and lighthouse-ci.yml into a single .github/workflows/ci.yml.

What's in ci.yml

7 jobs, all triggered on PR sync:

• lint — ESLint, tsc --noEmit, markdown lint on changed files
• unit-tests — pnpm test:unit
• visual-tests — Storybook → Chromatic
• build — single mock-data build (en/es/zh/ar) shared as next-build artifact
• e2e — Playwright against the Netlify deploy preview (was previously workflow_dispatch-only — now automated)
• lighthouse — local server from build artifact, posts sticky PR comment
• page-visual — Playwright + Chromatic Pages, runs in mcr.microsoft.com/playwright container

Extended jobs (everything except lint + unit) gate on PRs targeting master/staging/test/**.

Notable changes outside the workflow

• next-env.d.ts committed (removed from .gitignore) — Next.js docs require this; without it, tsc fails on @/public/*.png imports because the next/image-types/global reference is missing.
• type-check script added to package.json.
• Composite actions under .github/actions/: setup-pnpm-node (pnpm + Node-from-.nvmrc + install) and wait-for-server.
• Action versions bumped: actions/github-script@v3→@v7, chromaui/action@v1→@v16, marocchino/sticky-pull-request-comment@v2.0.0→@v2.

Test plan

• All 7 jobs green on test/ci-validation validation PR (ci: validate consolidated workflows (extended path) #18140, now closed)
• Lint job correctly passes on this PR (extended jobs skip — gating works)
• First merged PR into master/staging will exercise the extended path