bug: pubky profile appears missing after a failed session restore #811

Twin: synonymdev/bitkit-android#1344
Refs: #796

What happened?

After a connection loss or a device clock change, a failed Paykit session restore makes an existing profile appear missing, and contacts can be discarded.

Expected behavior

Bitkit keeps the saved identity, profile and contacts, and retries the restore when the connection returns or the app resumes.