💄 Enhance navigation and forms for better usability

Improve menu interactions and layout for sign up and sign in forms. ✨ Add impersonation feature for public authors Enable admins to impersonate authors for testing and support, with visual indicators and session management. ✨ Add email search and fix entries count default in authors table 🎨 Enhance sign up and sign in headings with icons Add icons to the sign up and sign in headings for improved visual appeal.