Updating copywriting for passwordless login in the Portal

To avoid confusion by changing some copywriting in the portal

**In Custom Login Methods**

- `Passwordless via SMS` -> `Passwordless via Phone`

**In Verification and passwordless settings**

- `Verify phone number by` -> `Send 6-digit OTP to phone by Whatsapp and/or SMS`

- `Verify email by` -> `Send login link or 6-digit OTP via email`

Search the Portal for the three existing labels named in the issue and identify the login-method and verification/passwordless settings views that render them. Update those labels to the requested wording, then review the affected views to confirm all three replacements match the issue and screenshots.

Written by the indexing model from the issue text.