feat(mobile): @pacto-connect/react-native SDK for embedded checkout in mobile apps

[aguilar1x]

Context

Pacto Connect currently only targets web (React, web components). Mobile-first merchants have no supported path to embed a Pacto checkout in a native app.

Scope

• New packages/connect-react-native package wrapping the hosted checkout flow (WebView-based, using the same handshake/session model as connect-core) rather than reimplementing UI natively.
• Deep-link / universal-link handling for returning from any external payment step.
• Escrow event subscription surfaced via a React Native hook, reusing connect-core's SSE client where the platform allows, with a documented polling fallback where it doesn't.

Acceptance criteria

• A bare React Native app can trigger a checkout, complete it in the embedded WebView, and receive an escrow-status callback in JS.
• Works on both iOS and Android in the example app under apps/docs (or a new apps/example-rn).
• No merchant secret key is ever bundled into the mobile app.

[helenahelenavanbeek-png]

I would like to work on this issue. I have experience with Rust and Soroban smart contract development. I will follow the acceptance criteria and add tests. Excited to contribute. Kindly assign.

[zeemscript]

Hello, I’m interested in working on this issue and would appreciate being assigned to it. Thank you.

[SudiptaPaul-31]

Hey Maintainer!!! My name is Sudipta Paul a very old contributor of GrantFox and other platform having quite a lot of experience in open source and working with full stack issues as well as very much proficient in writing contracts and would love to work on this issue and contribute to your project, May I be assigned to this task

[KevinLatino]

Hi! I'm Kevin Latino, a Software Engineer with 3 years of experience specializing in React, React Native, and TypeScript. I'd love to work on this issue, it matches my experience building SDKs, mobile integrations, and developer-focused tools.

[grantfox-oss]

🦊 GrantFox — @KevinLatino has been assigned to this issue as part of the Official Campaign | FWC26 campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #38)
2. Your PR will be reviewed by the PACTO-LAT maintainers

Good luck! Track your progress on GrantFox.

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign | FWC26 campaign!

@KevinLatino's PR #53 was approved and merged by @aguilar1x.

🏆 @KevinLatino: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (131 total points). Track your full progress on GrantFox.

👏 Great work, @KevinLatino! Keep contributing to PACTO-LAT.