1. Added missing base variables in get_variables():
- site_name, site_title, store_name
- shop_url, my_account_url
- support_email, current_year
2. Fixed social icon URL path calculation:
- Was using 3x dirname which pointed to 'includes/' not plugin root
- Now uses WOONOOW_URL constant or correct 4x dirname
3. Added px-6 padding to EmailBuilder dialog body
4. Added portal container to Select component for CSS scoping
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