- Encrypt credentials before storing in localStorage when OS keyring unavailable
- Decrypt on retrieval with automatic fallback
- Backward compatible with existing unencrypted data (migration on next set)
- Add comprehensive unit tests (11 test cases)
Security: Credentials are now encrypted using AES-GCM when
OS keyring is unavailable, preventing plaintext exposure.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
