test(e2e): add combined-listings recipe e2e tests

[itsjustriley]

WHY are these changes introduced?

Adds e2e test coverage for the combined-listings recipe, which enables displaying and managing combined listings created with the Shopify Combined Listings app. This continues the systematic testing of recipes to ensure all user-facing changes are validated.

This PR is stacked on #3543 (bundles tests).

WHAT is this pull request doing?

Adds e2e/specs/recipes/combined-listings.spec.ts with 6 tests covering:

• "Add to cart" button hidden on parent combined listing products
• Price range display (From $X To $Y) for combined listings
• Variant selection URL navigation behavior
• Parent products filtered from collection listings
• Regular products show "Add to cart" button normally
• Regular products don't display price ranges

Tests use role-based selectors, .toHaveCount(0) for robust absence testing, and follow established patterns from existing recipe tests.

The combined-listings recipe allows grouping separate products together into a single product listing using a shared option like color or size. Parent products are hidden from collection listings by default.

HOW to test your changes?

# Run combined-listings recipe tests only
npx playwright test --project=recipes combined-listings

# Run all recipe tests
npx playwright test --project=recipes

All tests pass (25 total: 6 bundles + 6 combined-listings + 7 infinite-scroll + 6 markets).

Checklist

• I've read the Contributing Guidelines
• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've added a changeset if this PR contains user-facing or noteworthy changes
• I've added tests to cover my changes
• I've added or updated the documentation

[shopify]

Oxygen deployed a preview of your recipe-test-combined-listings branch. Details:

Storefront	Status	Preview link	Deployment details	Last update (UTC)
Skeleton (skeleton.hydrogen.shop)	✅ Successful (Logs)	Preview deployment	Inspect deployment	March 11, 2026 8:50 PM

Learn more about Hydrogen's GitHub integration.

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