[Enhancement] - add nostr wallet connect

[islandbitcoin]

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Feature: Nostr Wallet Connect (NWC / NIP-47) Support

Overview

Implement Nostr Wallet Connect (NIP-47) as a "wallet service" in the Flash stack, allowing external Nostr-enabled apps to send Lightning payments from a user's Flash wallet using a connection URI, subject to configurable spending limits.

Goals

• Users can create NWC connections from the Flash mobile app
• Each connection has independent spending limits (separate from account limits)
• External apps can use NWC URIs to send Lightning payments without manual confirmation
• Users can view, manage, and revoke connections at any time
• Full NIP-47 compliance with encryption (NIP-44/NIP-04)

References

• NIP-47 Spec: https://nips.nostr.com/47
• NWC Docs: https://docs.nwc.dev
• Flash Backend: https://github.com/lnflash/flash
• Flash Mobile: https://github.com/lnflash/flash-mobile

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Implementation Plan - 7 PRs

Each PR is independently deployable and reviewable

PR #5: Mobile - GraphQL Integration & Navigation

~250 lines | Mobile

Deliverables:

• GraphQL mutation/query definitions (TypeScript)
• Navigation route definitions for NWC screens
• Placeholder/stub screen components
• i18n string definitions (English)
• TypeScript types for NWC operations

Files:

• flash-mobile/app/graphql/nwc-operations.ts
• flash-mobile/app/navigation/root-navigator.tsx
• flash-mobile/app/navigation/stack-param-lists.ts
• flash-mobile/app/screens/wallet-connect-screen/index.ts
• flash-mobile/app/i18n/en/wallet-connect.ts
• flash-mobile/app/i18n/mapping.ts
• flash-mobile/test/graphql/nwc-operations.spec.ts

Deployment:

• Can merge without breaking app, no visible UI changes yet

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PR #6: Mobile - Settings Integration & List Screen

~320 lines | Mobile

Deliverables:

• "Wallet Connect" settings row component
• Connection list screen with real data fetching
• Pull-to-refresh functionality
• Revoke connection with confirmation dialog
• Empty state UI
• Error handling and loading states
• Component tests

Files:

• flash-mobile/app/screens/settings-screen/wallet-connect-settings-row.tsx
• flash-mobile/app/screens/settings-screen/settings-screen.tsx
• flash-mobile/app/screens/wallet-connect-screen/wallet-connect-list.tsx
• flash-mobile/app/components/wallet-connect/connection-list-item.tsx
• flash-mobile/test/screens/wallet-connect-list.spec.tsx

Deployment:

• Users can view NWC settings section (if feature enabled)
• Can view and revoke existing connections
• Can't create new connections yet (next PR)

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PR #7: Mobile - Create Connection & QR Display

~420 lines | Mobile + Docs

Deliverables:

• Create connection form screen with validation
• QR code display screen
• Copy to clipboard functionality
• Share sheet integration
• Connection detail screen
• Error handling and loading states
• User documentation (how to use NWC)
• Developer documentation (architecture & API)
• E2E test for full flow

Files:

• flash-mobile/app/screens/wallet-connect-screen/wallet-connect-create.tsx
• flash-mobile/app/screens/wallet-connect-screen/wallet-connect-qr.tsx
• flash-mobile/app/screens/wallet-connect-screen/wallet-connect-detail.tsx
• flash-mobile/app/components/wallet-connect/nwc-uri-display.tsx
• flash/docs/nwc-user-guide.md
• flash/docs/nwc-developer-guide.md
• flash-mobile/test/screens/wallet-connect-create.spec.tsx
• flash-mobile/test/e2e/wallet-connect-flow.spec.ts

Deployment:

• Complete feature available to users
• Users can create, view, manage, and revoke NWC connections