feat(samples): point headless-search-react at BarcaKnowledge with knowledge-base facets

[alexprudhomme]

KIT-5685

Problem

The headless-search-react sample was wired to the generic sample search hub, demoed facets on generic fields, and had grown into a large multi-page demo (with SSR server code and many legacy feature pages). We want a small, copy-friendly scaffold that targets the BarcaKnowledge knowledge base.

Solution

• Point the sample's SearchEngine at searchHub = 'BarcaKnowledge'. This is done in a new src/engine.ts (buildEngine()) built on getSampleSearchEngineConfiguration() — there is no separate engine-configuration.ts module, and the SSR/server code was removed as part of the consolidation.
• Consolidate the multi-page/demo-heavy React Router sample into a single minimal UI (search box, facets, results, pager) with a shared useController hook for Headless controller subscriptions.
• Repoint the facets to knowledge-base fields: ec_category (hierarchical), article_type, robot_series, difficulty_level, plus author and date.
• Track result clicks: a ResultLink component uses buildInteractiveResult so opening a result logs a click analytics event (feeds query suggestions). Result hrefs go through a filterProtocol allowlist and open with rel="noopener noreferrer".
• Accessibility: the current pager button uses aria-current="page" (omitted otherwise).

Tested

• pnpm build passes; vitest 1/1 passes; oxlint/oxfmt clean.
• App loads with 0 console errors; live POST /rest/search returns 200 with searchHub=BarcaKnowledge and the new facets.

Notes

• For facet values to render, the org must have BarcaKnowledge content indexed with these fields enabled as facets (platform-side dependency).

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commit: 48683dd