test: cover useWallet Freighter state paths

[BowenMilner]

Closes #590.

Summary

• add RTL/Vitest coverage for useWallet
• mock @stellar/freighter-api getAddress across connected, disconnected, error, thrown exception, and repeated connect scenarios
• verify mount auto-detection, connect, disconnect, and state clearing behavior

Validation

• npm test -- src/hooks/__tests__/useWallet.test.tsx
• npm run test:coverage -- src/hooks/__tests__/useWallet.test.tsx --coverage.include=src/hooks/useWallet.ts
  • useWallet.ts: 100% statements, branches, functions, and lines
• npx eslint src/hooks/useWallet.ts src/hooks/__tests__/useWallet.test.tsx
• git diff --check

Note: npm run lint still fails on existing unrelated repo issues outside this change, including parse errors in src/app/api/commitments/[id]/settle/route.ts and src/components/modals/CommitmentDetailsModal.tsx.

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[BowenMilner]

Closing this as a duplicate after noticing #604 was already submitted for #590. I missed the issue comment during my initial check; sorry for the noise.