fix: prevent crash when reading user IDs from secure storage

[anthonioez]

Safely unwrap the "acct" keychain attribute using compactMap and as? String to prevent fatal errors when the value is missing or not a String.

[CLAassistant]

All committers have signed the CLA.

[shuyck]

Hi @anthonioez,

Thanks for opening this PR and for the proposed fix here.

Would you be able to share reproduction steps or a bit more context on when the fatal error happens when reading the user IDs from secure storage? In particular, it would be helpful to know what conditions lead to the acct keychain attribute being missing or not a String.

Those details will help us better understand the underlying issue and validate the fix. Thanks again for the contribution.