feat(escrow,wallet): dispute resolution form + multi-sig pending approvals widget

[QueenColly]

Description

Closes #130 — Add delivery dispute resolution multi-step form with evidence upload and escrow lock.
Closes #131 — Add dashboard widget for pending multi-signature operations with Freighter signing integration.
What I changed

Escrow dispute flow: Implemented multi-step DisputeForm and hook with full Zod validation, file uploads, confirmation, and success view.
Files: useDisputeForm.ts, DisputeForm.tsx
Multi-sig approvals: Implemented hook, component, services integration, and comprehensive tests.
Files: useMultiSigApprovals.ts, MultiSigApprovals.tsx
Tests: Added/updated tests for both feature areas and stabilized assertions.
Files: useMultiSigApprovals.test.ts, MultiSigApprovals.test.tsx
Minor fixes: Small UI/text adjustments and hook loading behavior to match test expectations.
Why

Provide users/drivers the ability to open secure disputes and freeze escrow payouts when necessary.
Surface pending multi-sig transactions requiring the connected wallet’s signature and make signing straightforward via Freighter.
How to test locally

Install dependencies:
Run the unit tests:
Manual UI checks:
Open app and connect Freighter.
Navigate to the dashboard area where MultiSigApprovals is mounted and verify pending ops, progress bars, signers list, and sign flow.
Open a delivery and test DisputeForm end-to-end (reason → evidence → confirm → success).
Test results

All new and updated tests pass locally: 31/31 passing.

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