Multisig: co-signing session persistence and export

[Nanle-code]

Labels: multisig, feature

Description

Multisig UI lives under src/components/multisig/ with coordinators in src/lib/multisig/. Sessions may not survive refresh; exporting partial signatures for offline signers is a common gap.

Tasks

Persist sessions in IndexedDB via src/lib/storage.js.
Export/import partial XDR + signature collection in SignatureCollector.jsx.
Integrate SigningCoordinator.ts with SessionManager.jsx.
Acceptance criteria

Refresh restores in-progress multisig session.

JSON export of pending signatures for external co-signers.
Files

src/components/multisig/SessionManager.jsx, SignatureCollector.jsx, MultisigManager.jsx
src/lib/multisig/SigningCoordinator.ts, MultiSigTransaction.ts
src/lib/storage.js
tests/integration/MultisigManager.test.jsx

[Samuel-21-eng]

@Samuel-21-eng has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi maintainer, I would love to work on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Samuel-21-eng to this issue.

[drips-wave]

Congratulations, @Samuel-21-eng! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @Samuel-21-eng: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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