[codex] add public contact payments

[ben-kaufman]

Description

Adds public Paykit payments to contacts on Android, matching the iOS public payments flow and the Paykit endpoint identifier spec.

• Publishes and removes spec-compliant Paykit payment endpoints for the current wallet.
• Adds payment discovery and launch flows for Add Contact and Contact Detail.
• Adds contact-tagged activity support and a contact activity screen.
• Threads contact context through immediate and pending send flows.
• Adds duplicate-contact validation parity and repo-level Paykit tests.
• Updates Paykit and bitkit-core bindings for the required endpoint and contact APIs.

Preview

N/A

QA Notes

Suggested reviewer checks:

• On the first-time Pay Contacts screen, choose enabled and continue; verify public endpoints are published for the current pubky.
• On a fresh first-time Pay Contacts path, choose disabled and continue; verify no public endpoints are published.
• Pay a saved contact with public endpoints from Add Contact and Contact Detail.
• Verify sent/pending contact payments attach activity to the contact.
• Verify Contact Activity shows Sent to {name} / Received from {name} titles.
• Paste or scan a pubky and verify routing to profile, existing contact, or add contact as appropriate.

[piotr-iohk]

Quick testing notes:

• Was able to Send onchain to contact 👍
• Failed to send lightning to contact

logs.zip

Screen.Recording.2026-05-04.at.22.14.04.mov

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• Send button should not be there on add contact screen, see: https://www.figma.com/design/ltqvnKiejWj0JQiqtDf2JJ/Bitkit-Wallet?node-id=40364-130299&t=xlSG6da1GwRIpMra-0

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• wrong icons and order for send and activity (iOS on the left, has correct ones) (https://www.figma.com/design/ltqvnKiejWj0JQiqtDf2JJ/Bitkit-Wallet?node-id=40364-130143&t=xlSG6da1GwRIpMra-0)

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• Contact activity only shows Sent to - but does not show Received from . Also on main activity "Received from..." is not displayed.(on both Android and iOS)

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• The note on Add contact says: "Please note that you and Paolo must add each other as contacts to pay each other privately. Otherwise, the payment will be visible publicly." (https://www.figma.com/design/ltqvnKiejWj0JQiqtDf2JJ/Bitkit-Wallet?node-id=41985-298235&t=xlSG6da1GwRIpMra-0) - but you seem to be able to pay to contact even if he didn't add you as his contact.

[ovitrif]

@codex review

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Remove unconditional node-running gate before endpoint build

syncPublishedEndpoints(publish = true) now always calls buildWalletEndpoints(refresh = true), and this block hard-fails unless the Lightning node is running. That prevents enabling public contact payments even when an on-chain address is already available, because the method throws before it even checks walletState.onchainAddress. In practice, users who toggle sharing while the node is stopped will get an error and cannot save the setting, despite having a valid publishable endpoint.

Useful? React with 👍 / 👎.

[ben-kaufman]

@piotr-iohk payment issue with LN seems like RGS error from the logs