[isaacanthonyabraham-star]

Summary

• Use WebAuthn platform authenticators for mobile fingerprint and face recognition, requiring a secure context and user verification.
• Validate that unlock assertions match the enrolled credential and include the authenticator's user-verified flag; keep the fallback as wallet disconnect/re-authentication.
• Track biometric enrollment, disablement, success, and failure in the existing local security activity feed.
• Restore wallet-security event and helper APIs removed from the current base while retaining its newer hardening utilities.
• Add focused tests for enrollment, credential matching, UV enforcement, availability, and analytics.

Verification

• npx vitest run src/__tests__/biometric.test.ts src/__tests__/SessionLock.test.tsx src/__tests__/walletSecurity.test.ts passes (31 tests).
• ESLint passes on the changed files.
• Full test and TypeScript checks remain blocked by unrelated existing failures on main, including syntax errors in src/app/invoice/new/page.tsx, src/components/DashboardClient.tsx, src/components/HelpTooltip.tsx, and src/components/QRModal.tsx, plus unrelated dispute-panel tests.

Closes #1012

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