fix(migrate/extract): detect header/footer on sites without semantic tags (VTEX IO)

[JonasJesus42]

From your report that header/footer weren't being found.

Root cause (probe of electrolux.com.ec): the DOM has 0 <header>, 0 <footer>, 0 [role=banner], 0 [data-section] — VTEX IO renders both as plain <div>s, so the semantic-tag detector found neither.

Fix: a geometry/anchor fallback in collectCandidatesInPage, firing only when nothing semantic matched (no regression for sites with real <header>/<footer>):

• header = the top-most full-width ancestor of the nav/logo/search (or a top [class*=header] container)
• footer = the bottom full-width [class*=footer] region with ≥4 links, or a bottom full-width block with ≥6 links

Shared by extract + migrate.

Verification

Full suite green (1100), tsc + biome clean, build OK. Live electrolux.com.ec now detects global/header + global/footer (+ minicart) where it previously found neither.

Next

The natural follow-up is linking each detected component ↔ its VTEX block ↔ content (using the block tree as the primary source for VTEX). Happy to do that next.

Off main.

🤖 Generated with Claude Code

---

Summary by cubic

Detects header and footer on VTEX IO and other sites without semantic tags. Previously we only matched <header>, <footer>, [role=banner], or [data-section]; now a geometry/anchor fallback runs when none are present, without changing behavior on semantic sites.

Review

• Adds a fallback in collectCandidatesInPage to infer header from the top-most full-width ancestor of nav, logo, or search, or a top [class*=header] container.
• Infers footer from a bottom full-width [class*=footer] with ≥4 links, or a bottom full-width block with ≥6 links.
• Executes only when semantic detection finds no header/footer; shared by extract and migrate. Single-file change: src/extract/detect-components.ts (+64).

Rollout

• No migration required.
• Verified on electrolux.com.ec: global header/footer now detected. Test suite and build are green.

^{Written for commit 4c9e2b7. Summary will update on new commits.}