fix(unhead): dedupe alternate links by hreflang/type without href#656
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…rop href from key Removes `href` from the alternate link dedupe key so that same-hreflang entries correctly dedupe (last push wins). Bare alternates without hreflang or type fall through to generic deduping logic.
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🔗 Linked issue
Related to #655
❓ Type of change
📚 Description
The previous alternate link dedupe key included
href, which meant same-hreflang entries with different URLs were treated as distinct tags instead of deduping. This removeshreffrom the key so<link rel="alternate">dedupes byhreflangortypeonly (last push wins). Bare alternates without either property now fall through to the generic deduping logic instead of being grouped underx-default.Adds edge case tests for RSS/Atom feed coexistence, same-type feed deduping, and bare alternate fallthrough.