Replace mobile carousel arrows with indicator dots in category tabs

[CySSoO]

Motivation

• On mobile, the carousel navigation arrows were removed in favor of dot indicators for a cleaner, touch-friendly UI.
• Indicators should only appear when there is more than one mobile slide to avoid unnecessary UI elements.

Description

• Updated the template views/templates/hook/prettyblocks/prettyblock_category_tabs.tpl to calculate the number of mobile slides using {assign var='mobileProductsCount' value=$block.extra.products[$key]|@count} and {math equation="ceil(x / y)" x=$mobileProductsCount y=$mobileItems assign='mobileIndicatorsCount'}.
• Rendered an <ol class="carousel-indicators"> block with a {section} loop to output indicator <li> elements when mobileIndicatorsCount > 1.
• Removed the mobile carousel-control-prev and carousel-control-next buttons so mobile carousels use dots instead of arrows, and applied the change to both mobile carousel occurrences in the file.

Testing

• No automated tests were executed as part of this change.

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Codex Task