Prepare for HF Space deployment

Add total leaderboard entries count to topbar

Remove Open Capability Index entirely

Let user configure which benchmarks feed the Open Capability Index

Require all 4 benchmarks for Open Capability Index

Fix index not showing: inject into cached data at startup

Add Open Capability Index composite leaderboard

Add input price, TTFT, throughput columns; fix table overflow

Replace DataFrame with rich HTML leaderboard table

Add inference provider enrichment to leaderboard table

Initial commit: sidebar+cards frontend redesign