System updates

🚀 Improvements
📊 Faster Dashboard Statistics
Dashboard statistics now come from pre-calculated daily figures instead of being recomputed from scratch on every request. Your dashboard loads noticeably faster, and the difference is biggest on accounts with a large customer base.
🐛 Bug Fixes
👥 Two Accounts Created by One Google Sign-In
Fixed signing in with Google occasionally creating two separate companies for the same email address.