feat: add userAddresses support for linked address selection #911
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Summary
This PR replaces the closed PR #702 with a cleaner implementation that properly supports linked addresses (userAddresses).
Changes:
useAddressItemshook for consistent address handling across all screensbuy.screen.tsxto support linked addressessell.screen.tsxto support linked addressesswap.screen.tsxswap.screen.tsx(was validating non-existent fields)How it works:
The new
useAddressItemshook generates address items that include:This enables cross-chain operations where users can receive funds on linked addresses (e.g., Lightning via Bitcoin wallet).
Why this approach vs PR #702:
PR #702 tried to separate blockchain and address selection into two dropdowns, but:
This PR keeps the single dropdown pattern (which works well) but adds userAddresses support consistently across buy, sell, and swap screens.
Test plan