[salahmyn]

Summary

Adds a shared MSW mock backend for the store API (tests/mocks/), so unit tests, and later Storybook and Playwright, stop hand-rolling per-file mocks.

• Handlers for the endpoints the engine's api modules request (store settings, products with sources/paging/sort, product details, categories, brands, header/footer menus, blog and articles, cart, current user).
• Typed factories (product variants: sold out, on sale, options, booking, digital; category, brand, menu item, cart, article, user, currency, store) and scenarios: default, empty store, sold-out product, store with blog, multi-currency.
• server.ts (node, for vitest/jsdom, opt in with installMockServer()) and browser.ts (worker for Storybook/Playwright).
• tests/components/home/ProductsSlider.test.tsx now uses the shared handlers and the real engine api client instead of mocking the engine module. tests/mocks/handlers.test.ts exercises the handlers through the engine client.
• README in tests/mocks/.

Not confirmed

• Testimonials, reviews, orders, wallet, loyalty, notifications and pages have no handler: the engine types/paths were not verified, so nothing was invented. Real sort values and the real cursor.next format were not confirmed either.
• createStore fills the fields the theme reads, cast to the engine's Store.
• Only ProductsSlider was converted (the other engine-api mocking tests assert synchronous call params and are tied to module mocks); Blog's fixtures use shapes that differ from the engine types.

Verification

lint, format:check, typecheck, check:manifest and build exit 0. pnpm test has 4 failures in ProductDetails.test.tsx (localStorage undefined) that also fail on the base branch under Node 26 here; CI pins Node 22. Because of them test:coverage exited 1 locally.

Closes SAL-3521

Confidence Score: 5/5

The PR appears safe to merge; the previous tag-filter issue is fixed and no new blocking issues were found.

Summary

Adds a shared MSW backend with store API handlers, typed factories, and reusable scenarios.

• Tests and browser demos can use one shared mock store API.
• The ProductsSlider test checks requests through the engine API client.

_{Reviews (4) · Last reviewed commit: "test(themes): filter the tags source in ..." · Reviewed by Greptile}

[salahmyn]

@greptileai please review this pull request.

[salahmyn]

This branch conflicts with the base branch feature/quality-gates-twig-parity-audit, which has moved (CI, knip, F4 and F7 are merged), so CI and the review have not run on it. Please rebase on the base branch, resolve the conflicts (likely package.json and pnpm-lock.yaml), run build, typecheck, lint, format:check, test:coverage, check:manifest and knip, push, and wait for the Greptile review and the Quality gates check to pass.

[salahmyn]

@greptile-apps please review

[salahmyn]

@greptileai review

[greptile-apps]

Automatic reviews are disabled for this repository.