v1.5.24 — Campaign Editor Layout & UX Fixes

What's Fixed

• Field layout — all field + Regenerate button pairs now sit side-by-side (flex row). Affects Subject Line, Preview Text, Main Headline, Main Description, Coupon Code, Discount Display Text, and product Headline / Description fields.
• Device preview toggle — desktop/mobile toggle in the campaign editor now works correctly.
• Template mini-cards — editor template strip now renders with proper swatch, name, hover, and active states.
• Product card image — constrained to 96×96 px with object-fit cover.
• Show Buy Button — replaced plain checkbox with the inline custom toggle component.
• Remove product button — now icon-only (no "Remove" text label).
• Date pickers — coupon expiry and schedule modal date inputs use the native browser date picker (type="date"). Resolves the "does nothing on click" bug.
• Schedule modal — body and footer now have proper 20 px padding.
• Mailing list load error — shows a human-readable error message instead of leaving the user stuck on "Loading…".