## Vertical carousel layout
Recipe was making the indicator group stretch full width (380px) because
the root stayed in `flex-direction: column` and the indicator-group
inherited `align-items: stretch`. Reshaped:
- `[data-carousel][data-orientation='vertical']` now flips the root to
`flex-direction: row` so viewport and indicator-group sit side-by-side.
- Viewport takes `flex: 1 1 auto` of the inline axis with explicit
100% block-size.
- Indicator-group becomes `flex: 0 0 auto; inline-size: max-content;
align-self: center` — narrow column of dots on the right edge.
Active vertical-stretched indicator already had `block-size: 2.25×`
treatment from the prior commit, so it now appears as a vertical pill
inside the dot column.
## i18n controls: follow canonical pattern
Mirrored the date-range-picker / calendar demos verbatim — those are
the canon and the new demos drifted from them. Three corrections:
1. **Locale**: `<select>` with `en-US / es-ES / fr-FR` (the docs
canon — chip rows and made-up locale lists like ar/he/ja were both
inventions). Carousel exposes locale too; it's forwarded to soma
for downstream lang-aware behavior (announcer text, future label
formatting hooks).
2. **Direction**: chip row with `ltr / rtl` (no `auto`). Label is
"direction" not "dir".
3. **State shape**: plain `let dir = $state<Direction>('ltr')`, not
the synthetic `dirCtl + derived` pattern I had invented.
Applied across all three demos so they read identically to the canon.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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