[huangji6693-max]

Closes #300

Summary

Implements the Multi-Signature Transaction Coordinator UI and Partially-Signed XDR Sharing pipeline for Stellar/Soroban accounts configured with multi-sig signers and custom threshold weights:

• Partial XDR Envelope Inspection (frontend/src/lib/xdrDecode.ts): Added decodePartialTransactionEnvelope to decode partial/unsigned/signed TransactionEnvelope XDRs, match DecoratedSignature hints and Ed25519 signatures against configured signers & weights, calculate threshold progress (e.g. "Weight 10/20 reached"), and decode Soroban contract invocation arguments into human-readable parameters.
• Partial Signing, Signature Merging & Shareable Coordination Bundles (frontend/src/lib/sorobanTxHelpers.ts): Added signPartialTransactionEnvelope (Freighter, Ledger, Web3Auth), appendSignatureToEnvelope (deduplicating signature merge), URL-safe encodeShareableMultiSigPayload / decodeShareableMultiSigPayload / buildMultiSigShareUrl (?multisig=msig1...), and submitMultiSigEnvelopeIfReady.
• Multi-Sig Coordinator Hook & Modal (frontend/src/hooks/useMultiSig.ts, frontend/src/components/MultiSigCoordinatorModal.tsx): Interactive coordinator modal displaying signer checklist & weights, threshold progress bar, decoded contract operation inspector, 1-click wallet partial signing, external XDR signature merging, shareable URL + QR payload + .xdr file export, and automatic Soroban RPC submission as soon as threshold weight is reached.

Verification

• npx vitest run src/hooks/useMultiSig.test.tsx (4/4 unit & integration tests passing)
• npm run lint (0 errors)
• npm run build (tsc -b && vite build, exit 0)

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