Two new eidos-level booleans on `<Carousel>` so consumers can toggle
the indicator dots and the prev/next triggers without touching the
markup composition. Defaults stay `true` (existing behaviour).
The consumer still renders the parts in markup; the recipe just hides
them via `display: none` when the eidos root stamps
`data-hide-indicators` / `data-hide-controls`. Toggling on/off doesn't
unmount the DOM, so ARIA focus is preserved across the change and the
layout doesn't reflow into a different size.
Naming follows the canonical eidos cascade — `showIndicators`
mirrors calendar's `showWeekNumbers`. Mantine uses `withIndicators`
(default false); we default `true` because the Eidos recipe assumes
indicators are part of the default surface.
Demo: two switches added to the eidos visual-props section + snippet
preview emits the prop when set to false.
Verified: clicking the demo switch flips
`data-hide-indicators` on the root and the indicator-group's
computed `display` goes from default to `none` without remounting.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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