security keys not working when Vanadium is configured to use third party credential providers

[oppressor1761]

Description: last update added the ability to use both security keys and passkeys under the scenario 1. using passkeys works while using security keys doesn’t work. I also included several other testing scenario for reference.

Environment:husky, 2026042101. Vanadium 148.0.7778.96 Config 177. In Settings, Bitwarden is always enabled and set to preferred autofill service. Google Play installed.

Scenario 1: Vanadium is configured to use third party credential providers. Google Play is enabled as a secondary autofill service in ‘Settings’. Passkeys work but security keys doesn’t work.
Expected result: user should be able to store and use credentials on Google Password Manager, Bitwarden and security keys
Actually Result: user can store and use credentials on GPM and Bitwarden. security keys not working.

Scenario 2: Vanadium is configured to use Google autofill. Google Play is enabled as a secondary autofill service in ‘Settings’.
Result: Everything works fine. user can store and use credentials on GPM and security keys. Bitwarden cannot be used.

Scenario 3: Vanadium is configured to use third party credential providers. Google Play is disabled as a autofill service in ‘Settings’. Result: **Passkeys work but security keys doesn’t work. I think this is expected?** User can store and use passkeys in Bitwarden.

[oppressor1761]

Scenario 4:Set Google as preferred auto services in Settings. Vanadium is configured to use third party credential providers.
Result: user can store and use passkeys in GPM and Bitwarden. Security keys can't be used.

Scenario 5:Set Google as preferred auto services in Settings. Vanadium is configured to use Google autofill.
Result: User can store and use credentials in GPM and security keys.

Looks like in order to use security keys, user has to set Vanadium to use Google autofill.