Implement breez lightning address#602
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…rameter in the SDK configuration and implement lightning register related methods
This was
linked to
issues
Mar 30, 2026
…when user enables btc wallet
…t id on the default-wallet screen and set-default-account-modal
…method to filter out external wallets
…bitcoin-details screen
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## Summary
This PR fixes the BTC/Breez external-wallet setup flow and the main manual-send edge case found during simulator testing.
### Fixes included
- Stabilized Breez external wallet setup: (352619d935a32285acb4d7b3e51e275d79365283)
- waits for `updateExternalWallet(input: { lnurlp })` instead of treating it as fire-and-forget
- stores the backend-returned BTC/external `walletId`
- retries registration when `me.username` becomes available after Breez SDK init
- prevents duplicate registration attempts
- shows loading/error/retry states instead of surfacing raw `missing walletIds`
- Fixed manual username sends for USD → BTC-default recipients: (f0acdf2008981d0e67fc7e8d82480ef676293f1e)
- when a sender’s default wallet is USD and the receiver’s default wallet is BTC/Breez, bare username entry now routes through LNURL (`username@<lnAddressHostname>`) instead of the USD intraledger mutation
- USD → USD username sends still use the existing intraledger path
- full lightning address sends continue to use the existing LNURL path
### User testing covered
Tested with:
- Pixel 9 Android simulator
- iPhone 17 simulator
Passing cases:
- External wallet pays Flash user with USD default
- External wallet pays Flash user with BTC default
- Flash BTC default pays Flash USD default
- Flash BTC default pays Flash BTC default
- Flash USD default pays Flash USD default
- Full lightning address works for USD → BTC-default recipient
- Manual bare username now works for USD → BTC-default recipient
### Known follow-up
There is still a separate edge case for non-manual entry points: QR/NFC/card flows that resolve to a bare Flash username may still route through the shared intraledger parser and fail for USD sender → BTC-default receiver.
Tracked separately in Linear: [ENG-399](https://linear.app/island-bitcoin/issue/ENG-399)
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islandbitcoin
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May 22, 2026
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bugs fixes applied, ACK
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