chore(deps): bump nostr-crypto-utils 0.5.0 → 0.5.2

Eliminates crypto-browserify dependency chain (48 packages removed).
Resolves all 5 low-severity elliptic audit findings. npm audit now 0 vulns.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: vveerrgg