* user key transferred over ipc within desktop app without its prototype.
`UserKey` object was transferred over IPC as regular `Object` type and not recreated as `SymmetricCryptoKey` type, losing its original functions and properties. As a result `inner` method did not exist and user key silently failed during decryption of encrypted client key halves during biometric unlock.
* ipc biometrics serializable user key type
* use encrypt service directly for decryption
* moving electron key service to KM
* log error when unlock via biometrics fails with exception in lock component
* bring back tech debt comment
* lock component logging prefix
