v1.5.28 — AI toggles, coupon variants, mailing list fix

What's New

Added

• "Generate with AI" toggles in Section Builder — every text/textarea field in the section settings panel now has an inline AI badge toggle. When enabled (default), the field is populated by AI on campaign generation; when disabled, the user's manually entered text is preserved. Excluded: button text, CTA text, and URL fields.
• Coupon section variants — three new coupon section types:
  • Coupon — Banner — dark full-width horizontal bar
  • Coupon — Card — white card with 4px solid left border accent
  • Coupon — Split — two-column layout with large discount number
  • The original Coupon — Classic gains headline, subtext, text_color, padding_top, padding_bottom fields.

Fixed

• Mailing list never loading — removed N+1 Brevo API calls; now uses totalSubscribers from the initial bulk response, eliminating the timeout that prevented the dropdown from populating.
• Generation popup wrong colours — modal background is now var(--bcg-bg-surface) (dark navy), matching the admin UI dark theme and making the text visible.