Improve heroe carousel layout and behavior

[CySSoO]

Motivation

• The heroe slider must display three slides visually with the center slide larger like Apple-style carousels and avoid image cropping.
• The previous heroe carousel logic produced incorrect next/prev assignment for small slide sets and the slider did not always re-initialize on resize.

Description

• Adjusted the heroe carousel JS in views/js/everblock.js to compute nextIndex/prevIndex defensively, wrap prev/next when there are more than two slides, and keep three slides visible by default.
• Re-added initHeroeCarousels to the global resize handler so the heroe carousel layout is recomputed on window resize.
• Tuned styles in views/css/everblock.css to reduce center slide width (--heroe-slide-width from 70% to 62%), increase active slide scale, and soften adjacent slides (scale/opacity) for a stronger center emphasis.
• Prevented image cropping by switching media to object-fit: contain, added a media background, and adjusted initial slide scales for smoother visual transitions.

Testing

• No automated tests were executed for this change.

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Codex Task