Added HTML Widget with Tabs (fully HTML without Java )

Added HTML Widget with Tabs (fully HTML without JavaScript)

A new HTML Widget with Tabs has been added on the BooStore platform. This widget works without additional scripts and allows organizing multiple tabs inside a block.

Each tab can interact with product widgets, providing convenient viewing and navigation.

Moving to a new level without jQuery. SaaS BooStore fully abandons jQuery.Added two additional options when importing products.Added the ability to update when importing the "quantity of goods in stock" by a mathematical expression.