feat: enhance AI Builder interface

[okon-emma]

Overview

This PR significantly enhances the AI Builder interface with professional UX improvements, better dropdown styling, and improved user experience.

Key Changes

UI/UX Enhancements

• Professional dropdown styling with proper MUI standards
• Enhanced visual hierarchy with better spacing and typography
• Interactive dropdowns that allow exploration of available options
• Improved layout balance between input parameters and example output
• Professional email template examples with realistic phishing scenarios

Technical Improvements

• Proper MUI menu styling with shadows, borders, and padding
• Consistent hover effects across all form elements
• Better responsive design with improved grid layouts
• Enhanced accessibility with proper cursor states and visual feedback

Content Updates

• Realistic HR salary increase email example demonstrating sophisticated phishing scenarios
• Comprehensive parameter system showcasing professional security consultant approach
• Streamlined interface removing unnecessary informational blocks
• Professional terminology throughout the interface