feat(products): add SectionProducts component for server-side section rendering #726

Title:
feat(products): add SectionProducts component for server-side section rendering

Description:
Create a SectionProducts component alongside the existing Products component that loads product markup via Shopify section rendering. This component should fetch HTML from /search?section_id=<section_id>&q=<handles> where handles are colon-separated product handles, then render the returned markup directly.

Acceptance Criteria:

• Create SectionProducts component at src/components/Products/SectionProducts.tsx
• Component accepts props for sectionId and uses product handles from search results
• Fetches HTML from /search?section_id=${sectionId}&q=${handles.join(':')} endpoint
• Renders returned HTML markup using dangerouslySetInnerHTML or similar approach
• Maintains same loading states and styling as existing Products component
• Uses useDecoratedSearchResults to get product handles from current search results
• Handles loading, error, and success states appropriately
• Add TypeScript types for component props and fetch response

Technical Requirements:

• Follow existing patterns from Products.tsx for state management and styling
• Use fetch API or appropriate HTTP client for section rendering requests
• Implement proper error handling for failed section requests
• Ensure component works with existing search flow and decorators
• Add loading states that match existing Products component behavior

Files to Create/Modify:

• src/components/Products/SectionProducts.tsx - New component
• Add unit tests for the new component
• Create Storybook story demonstrating section rendering

Validation:

• npm run lint passes without errors
• npm run test passes all component tests
• npm run typecheck passes without TypeScript errors
• npm run storybook shows component rendering correctly
• Manual testing confirms section rendering works with valid section IDs

References:

• Existing component: Products.tsx
• Search hooks: @nosto/search-js/preact/hooks
• Shopify section rendering API pattern