Configure Supabase leaderboard credentials

Add leaderboard with HuggingFace OAuth and Supabase integration

Streak-based scoring: score equals streak, resets on wrong answer

Content first: smaller thumbnails, more title lines (4), more summary lines (8)

Fix: Remove height-based vertical stacking - cards stay side by side on desktop

Major UI overhaul: glassmorphism cards, larger thumbnails, better animations, polished game feel

Make layout fit 100vh - no scrolling, responsive to all screen sizes

Fetch papers from multiple dates for better vote distribution

Use monthly papers for better vote distribution (1-94 upvotes range)

Fix: Make View Paper link clickable when card is disabled

Initial commit: Paper Popularity Game