Add 4-image slider to Category Tabs prettyblock

[CySSoO]

Motivation

• Allow editors to upload up to four images per Category Tabs tab and display them as a visual slider above the product grid, matching the provided mockup.
• Reuse the existing Prettyblocks carousel assets and behavior to keep consistent UI and interactions.
• Keep the feature optional so tabs without images are unchanged and existing slider/product logic remains intact.

Description

• Added four fileupload fields (slider_image_1..slider_image_4) to the Category Tabs repeater in src/Service/EverblockPrettyBlocks.php so each tab can store up to four images.
• Updated the tab template views/templates/hook/prettyblocks/prettyblock_category_tabs.tpl to collect any configured slider images and render a Bootstrap carousel (with indicators and prev/next controls) immediately before the products section when at least one image is present.
• The new carousel uses existing prettyblocks-image-slider classes and lazy-loading attributes to integrate with current CSS/JS initializers and to ensure consistent appearance and behavior.
• Changes are committed in two files: src/Service/EverblockPrettyBlocks.php and views/templates/hook/prettyblocks/prettyblock_category_tabs.tpl.

Testing

• No automated tests were executed for this change in this rollout.
• Template and PHP changes were saved and committed successfully to the local branch.
• The carousel rendering relies on existing prettyblocks-image-slider JS/CSS initializers already present in the codebase and should work when served in a running frontend environment.

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Codex Task