Add 2-of-3 guardian recovery system:
- Guardian invite via email or shareable link
- One-click approval page for recovery requests
- Social recovery initiation (anti-enumeration)
- 7-day recovery request expiry
Add second device linking:
- QR code + link for cross-device passkey registration
- 10-minute link expiry, one-time use
Enhanced profile page:
- Account security checklist (email, device, guardians)
- Guardian management (add/remove, max 3)
- Device linking with QR code display
- Recovery initiation form for lost devices
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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