feat(site): redesign pack cards with three-zone layout

[taylan]

Summary

• Restructure PackCard into three zones: title bar (border-bottom), flexible content area (flex-1), and fixed status bar (border-top) for consistent card heights across all packs
• Add iconOnly mode to AudioPlayer — renders a compact play/stop circle button with tooltip in the status bar
• Add dateUpdated field to pack data pipeline (types, generate script, registry entry passthrough)
• Remove redundant "preview →" link (whole card is already clickable)
• Fixed-height description slot keeps badges, tags, and author aligned across cards with/without descriptions

This is what it looks like after the changes:

Test plan

• npm run build passes with no type errors
• Cards are uniform height within each row on /packs
• Cards without description/tags still look clean (flex absorbs)
• Status bar aligns across all cards
• Play button works (plays/stops audio)
• Sound count tooltip shows "N sounds"
• Date shows correctly with tooltip ("Updated/Added ...")
• Tags don't spill to second line
• Long titles show full text on hover via tooltip

[vercel]

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