Airtable: ensure there is only one protocol when sync email/phone fields

[triozer]

Description

This pull request adds unit tests for the Airtable plugin's email and phone number field processing. It improves the handling of mailto: and tel: prefixes by normalizing them to ensure proper formatting regardless of input format. The implementation now correctly handles:

• Adding appropriate prefixes when missing
• Preserving single prefixes
• Normalizing multiple prefixes to a single one
• Supporting case-insensitive prefixes
• Detecting email and phone formats via regex

The PR also sets up the testing infrastructure with Vitest and Happy-DOM for the Airtable plugin.

See https://framer-team.slack.com/archives/C06L5H5ADK2/p1754387147011229

QA

• Email field processing
  • Verify mailto: prefix is added to emails without prefix
  • Verify single mailto: prefix is preserved
  • Verify multiple mailto: prefixes are normalized to one
  • Verify case-insensitive mailto: prefix handling works
  • Verify email detection by regex works for non-email field types
• Phone field processing
  • Verify tel: prefix is added to phone numbers without prefix
  • Verify single tel: prefix is preserved
  • Verify multiple tel: prefixes are normalized to one
  • Verify case-insensitive tel: prefix handling works
  • Verify phone detection by regex works for non-phone field types

[triozer]

• Airtable: ensure there is only one protocol when sync email/phone fields #364 👈 (View in Graphite)
• main

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[kaloyanvi]

LGTM