v3.9.0

Added

• Global Colours Manager — add, edit, and delete Beaver Builder global
  colours directly from the plugin settings page. Changes sync instantly with
  BB's Global Styles storage, so colours created here appear in BB's own
  colour picker and vice versa. Supports hex, rgb, rgba, and hsl values
  with a built-in alpha-channel Iris color picker.
• Tabbed settings UI with session persistence — BB Global Colours,
  Colour Mapping, and Settings & Styling each have their own tab.
• WordPress Iris color picker with alpha/opacity support (replaces native
  <input type="color">).

Changed

• Admin page restructured into three tabs for clearer organisation.