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This feature allows administrators to define custom CSS classes for individual HTML blocks. It enhances styling flexibility and integrates with common grid systems (e.g., Bootstrap `col-md-6`) by applying user-defined classes to the block's wrapper element. Includes: - A new `custom_class` field in the block model, form, and data handlers. - Database schema updates with an upgrade path to handle potential renames from `column_class`. - Frontend rendering to apply the classes. - Registration of `actionFrontControllerSetMedia` hook to load front-end CSS. - Basic responsive image styling for blocks.
