Leaderboard, bot directory, match history, and playlist pages now use
expandable rows/cards, IntersectionObserver lazy rendering, windowed
virtual scrolling (for 1000+ leaderboard entries), and batched "Show
more" affordances. All expand/collapse transitions respect
prefers-reduced-motion. Keyboard accessibility (Enter/Space to toggle)
and ARIA attributes (aria-expanded, aria-controls) added throughout.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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