Use registry preview_sounds in pack cards

[Sogl]

This makes OpenPeon respect registry.preview_sounds when building pack card previews.

What changes:

• site/src/lib/registry.ts now resolves preview sounds from entry.preview_sounds first
• falls back to the current category-first behavior when preview_sounds is absent or cannot be resolved
• site/src/components/ui/PackCard.tsx passes the full preview list to the play button
• site/src/components/ui/AudioPlayer.tsx randomly chooses one preview clip per click when multiple preview choices are available

Why:

• registry entries already expose preview_sounds as an array
• the site currently ignores that field and always uses only the first generated preview
• this keeps the existing single-button UI, but makes multi-preview packs actually work

Validation:

• npm run lint
• npm run build

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