ProjectOpenSea / opensea-js / 18507239892

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fix: correct price type for Listing API responses (#1770)

* fix: correct price type for Listing API responses

Fixes #1749 and #1682

The OpenSea API returns different price structures for listings vs offers:
- Listings have: `price: { current: { currency, decimals, value } }`
- Offers have: `price: { currency, decimals, value }`

This change updates the Listing type to correctly reflect the actual API
response structure with the nested `current` property, while keeping the
Offer type as is.

Changes:
- Updated Listing type to have `price: { current: Price }` instead of `price: Price`
- Fixed type checking in SDK fulfillOrder to handle the type field properly
- Verified fix against actual API responses from getBestListings and getAllListings

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

* Add tests for Listing price structure with nested current property

- Verify getAllListings returns listings with price.current structure
- Verify getBestListing returns listing with price.current structure
- Tests confirm fix for issue #1749 and #1682

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

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

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