passkey: Sign in doesn't work with macOS 15.0 + Safari 18.0 + Bitwarden

[iffy]

Internal ticket: 24100203N5b4G7W7

JS Console just shows "Something went wrong" when trying to sign in. Testing the passkey works fine.

[iffy]

Another report:

Ticket: 24101603s4L2W4N3
Bitwarden version 2024.8.2
Safari version 18.0.1
macOS 14.6.1

[StephenBrown2]

Confirming this also fails with Firefox on Linux.