Astra Pro - Extend Astra Theme With the Pro Addon 4.8.6

* Improvement: Introduced filter 'astra_addon_enable_modern_checkout' to enable/disable the modern checkout feature.
* Improvement: Made megamenu icon `alt` tags dynamic to ensure unique alt attributes for each image.
* Fix: Improvements as per Woo Marketplace coding standards.
* Fix: Sticky Header: Resolved an issue where the primary header would break when a custom hook layout was added using the 'before header' hook.
* Fix: Mega Menu - While selecting the default color multiple circles are visible.
* Fix: Resolved issue where Flyout width affected Full Screen layout for Off-Canvas in mobile/tablet views.
* Fix: Site Builder - Resolved an issue where the custom header hides the default header.
* Fix: Site Builder - Query Loop Block Preview Not Displaying in Block Editor of Site Builder.
* Fix: Site Builder - Resolved issue where posts/pages were not displaying under display conditions on the site builder dashboard.

* Improvement: WooCommerce - Cart - Improved the vertical quantity updater style for a better user experience.
* Improvement: Site Builder - Additional capabilities and options introduced on the dashboard's Site Builder page for better user experience.
* Fix: Header Builder - Toggle for Desktop - Showing two menus on the desktop when sticky header animation is enabled.
* Fix: Header Builder - Offcanvas - There was a glitch while closing the flyout in the responsive devices.
* Fix: Blog Pro - Reveal effect conflicts with the Themify plugin filters.
* Fix: Blog Pro - Blog post filter clashes when file generation option is enabled.
* Fix: Mega menu not working with the secondary menu, when the primary menu is not set.

* Fix: Blog Pro - The blog's pagination buttons loads the new posts but it does not scroll to the top of the page.
* Fix: Sticky Header - Sticky menu and submenu colors being overridden by Transparent Header colors.
* Fix: Sticky Header - Logo disappear when Sticky Logo Width is not set manually.