User wanted the testimonial section to feel "of the page" rather than
a card sitting on top of it, and to occupy less vertical space.
- Strip all chrome from .card--testimonial: transparent background,
no border, no shadow, no hover lift. Same treatment applied in the
swiss + cosmos overrides so per-theme backgrounds don't sneak back.
- Restructure the carousel markup to put the prev/next buttons
directly beside the viewport (carousel--inline = flex row), no
separate controls block, no dot indicators.
- Shrink the curly quote mark and the avatar (44 -> 32px); tighten
internal gaps. Removed the rule above the attribution row.
- Keep healthy horizontal padding via clamp() so the arrows don't
crowd the surrounding sections.
- Update aria-label on the carousel itself instead of the dots so
screen readers still get position context.
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