fix(phone): force WhatsApp icon/link for phone widgets when enabled

[RabbiIslamRony]

Ensure phone elements use WhatsApp icon and wa.me links when WhatsApp is enabled across single action, listing card action, and listing content phone fields. Keep non-phone and non-WhatsApp behavior unchanged.

PR Type

What kind of change does this PR introduce?

• Bugfix
• Security fix
• Improvement
• New Feature
• Refactoring (no functional changes, no api changes)
• Build related changes
• Text changes
• Other... Please describe:

Description

• Force WhatsApp icon (lab la-whatsapp) for phone elements when WhatsApp is enabled.
• Ensure phone links trigger WhatsApp (wa.me) for:
  • Single page layout > Action
  • All listings layout > Card > Action
  • Listing content phone fields
• Keep all other elements and non-WhatsApp phone behavior unchanged.

Scope

• templates/single/action-section.php
• templates/single/fields/phone.php
• templates/single/fields/phone2.php
• templates/archive/fields/phone.php
• templates/archive/fields/phone2.php

Test Plan

• Enable WhatsApp in phone field settings.
• Verify Single page Action phone button shows WhatsApp icon and opens WhatsApp.
• Verify Card Action phone button shows WhatsApp icon and opens WhatsApp.
• Verify Listing content phone fields show WhatsApp icon and open WhatsApp.
• Disable WhatsApp and confirm phone icon/link reverts to normal tel: behavior.
• Confirm email/button/other elements are unaffected.

Any linked issues

Fixes #

Checklist

• My code follows the WordPress coding standards