ProjectOpenSea / opensea-js / 20932068253

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fix: use chain-specific seaport address for collection offers (#1851)

The collection offer payloads were hardcoded to use the standard
cross-chain Seaport address (0x000000000)
instead of the chain-specific address. This caused validation failures
on chains like Somnia and Gunzilla that use a different Seaport contract
(0x00000000006687982678b03100B9bDC8be440814).

The fix updates getPostCollectionOfferPayload and getBuildCollectionOfferPayload
to accept a chain parameter and use getSeaportAddress(chain) to determine
the correct protocol address.

Fixes: https://github.com/ProjectOpenSea/opensea-js/discussions/1848

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

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