Minor cleanup: dead ternary in EventCard + misplaced benchmark file

[dergigi]

From review of PR #135:

1. Dead ternary in EventCard.tsx — result.isNpubFallback ? result.display : result.display — both branches are identical, can simplify to just result.display.

2. bench/nip66.ts leaked from the NIP-66 branch (feat: NIP-66 relay monitor integration #136) into Search perf, NIP fixes, replying-to usernames, highlights & mentions filter #135 — should only live in feat: NIP-66 relay monitor integration #136's scope.