Function is_encryption_enabled 

pub fn is_encryption_enabled() -> bool

Check if encryption is enabled in the database.

Delegates to state::resolve_encryption_enabled_from_db — the single source of truth that handles the missing-row case consistently. The previous implementation defaulted to false on missing rows, which silently disagreed with init_encryption_enabled (defaulted to true) and silently mis-routed login flows after an account swap.