Encrypted at-rest `AsyncStorage` for sensitive data

[kilodesodiq-arch]

Problem Statement. @react-native-async-storage/async-storage is plain on Android.
Field devices in humanitarian contexts are physically accessible.

Technical Context.
app/mobile/package.json.

Expected Outcome. Sensitive items go through encrypted-storage or
react-native-keychain. Documented in
docs/mobile/encrypted-storage.md.

Acceptance Criteria.

• A test asserts pairingUri is encrypted on disk.

Files or modules likely to be affected.
app/mobile/src/services/api.ts (uses AsyncStorage),
docs/mobile/encrypted-storage.md.

Difficulty. Medium
Estimated effort. M

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Backlog item #91 from `docs/maintainer-issue-backlog.md.

[Heazzy500]

Hello, I’ve gone through the requirements and I’m confident I can implement a proper solution that matches the acceptance criteria. Kindly assign this issue to me.

[Ayinkx1]

Hi i would like to work on this issue please assign to me
I can do it perfectly

[OluRemiFour]

Hi Maintainer,
Interested in working on this issue. I'll implement the requested changes and ensure everything is properly tested before submission.

Payout wallet (Stellar): GALHFNUOYOY4S5CNRK7OI7NKS7UNWYGSJII2POQ6XQKWMUVLKZ2SAWMP GrantFox OSS campaign — smart escrow payout on merge.

[grantfox-oss]

🦊 GrantFox — @OluRemiFour 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 #299)
2. Your PR will be reviewed by the ChainForgee maintainers

Good luck! Track your progress on GrantFox.

[OluRemiFour]

Problem Statement. @react-native-async-storage/async-storage is plain on Android. Field devices in humanitarian contexts are physically accessible.

Technical Context. app/mobile/package.json.

Expected Outcome. Sensitive items go through encrypted-storage or react-native-keychain. Documented in docs/mobile/encrypted-storage.md.

Acceptance Criteria.

• A test asserts pairingUri is encrypted on disk.

Files or modules likely to be affected. app/mobile/src/services/api.ts (uses AsyncStorage), docs/mobile/encrypted-storage.md.

Difficulty. Medium Estimated effort. M

Backlog item #91 from `docs/maintainer-issue-backlog.md.

Done, Kindly merge

[OluRemiFour]

🦊 GrantFox — @OluRemiFour 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 #299)
2. Your PR will be reviewed by the ChainForgee maintainers

Good luck! Track your progress on GrantFox.

Done