fix(carousel): use margin-auto centering and scale for nav button press effect

[ktisakib]

Problem

The carousel navigation buttons (CarouselPrevious, CarouselNext) use `top-1/2 -translate-y-1/2` for vertical centering. The Button component applies `active:not-aria-[haspopup]:translate-y-px` for a press effect. On click, `translate-y: 1px` overrides `translate-y: -50%`, causing:

1. Visual jump — buttons shift ~50% of the carousel height instead of a subtle 1px press
2. Click miss — the position shift moves the button out from under the cursor during the transition, causing clicks to fail on the top/bottom edge

Reproduction

https://ui.shadcn.com/docs/components/radix/carousel
https://ui.shadcn.com/docs/components/base/carousel

Solution

1. Replace translate-based centering with margin-auto

```diff

Horizontal

-top-1/2 -left-12 -translate-y-1/2
+top-0 bottom-0 my-auto -left-12

Vertical

--top-12 left-1/2 -translate-x-1/2 rotate-90
+-top-12 left-0 right-0 mx-auto rotate-90
```

This eliminates the translate conflict entirely — no `translate-y` to override.

2. Add scale-based press feedback via CSS

```css
.cn-carousel-previous {
@apply rounded-full transition-transform duration-150 ease-out hover:scale-105 active:scale-95;
}
.cn-carousel-next {
@apply rounded-full transition-transform duration-150 ease-out hover:scale-105 active:scale-95;
}
```

Files changed

• 2 base carousel components (`registry/bases/radix/ui/carousel.tsx`, `registry/bases/base/ui/carousel.tsx`)
• 6 CSS style files (vega, nova, maia, mira, luma, lyra)
• Added missing `/* MARK: Carousel */` section in `style-lyra.css`
• Registry rebuilt — all style variants and public JSON files updated

Fixes #10084

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