[PM-32771] Passkey authentication fails with "Passkeys not supported for this app" error in X (Twitter)

### Origin

Native Application (non-browser app)

### Web URL or App name

X

### Passkey Action

- [ ] Creating new passkey (Registration)
- [x] Signing in (Authentication)

### Build Information

Version 2026.2.0 (21203)

### Additional Information

When attempting to sign into the X (Twitter) Android app using a passkey stored in Bitwarden, the error "Passkeys not supported for this app" is displayed immediately after Bitwarden is prompted.

Steps to reproduce:
1. Have a passkey for X/Twitter saved in Bitwarden
2. Open X app → Sign in → Sign in with passkey
3. Bitwarden prompt appears, then shows "Passkeys not supported for this app"

The same passkey works on x.com in the browser.

X app version: 11.68.0

Related issues: #5322, #6164

### Issue Tracking Info

- [x] I understand that work is tracked outside of Github. A PR will be linked to this issue should one be opened to address it, but Bitwarden doesn't use fields like "assigned", "milestone", or "project" to track progress.