test(auth): SmartAuth Playwright E2E specs — login, MFA settings, security dashboard, devices, passkeys
- smartauth-login.spec.ts: Google Sign-In button presence, MFA challenge not shown initially
- smartauth-mfa-settings.spec.ts: MFA status, setup/disable flows with API mocking
- smartauth-security-dashboard.spec.ts: stats cards, login events table, suspicious filter
- smartauth-devices.spec.ts: device list, trust badges, revoke all button
- smartauth-passkeys.spec.ts: passkey list, add button, empty state, device type labels
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