Modernize chat window with improved styling and animations

[Copilot]

The chat window used in the dashboard and shell for communicating with agents has been completely modernized with a focus on improving the look and feel while maintaining all existing functionality.

Key Visual Improvements

Modern Design Elements

• Gradient Backgrounds: Applied sophisticated gradients throughout the chat interface
• Enhanced Shadows: Improved depth perception with modern shadow effects
• Rounded Corners: Increased border radius for a more contemporary appearance
• Modern Typography: Better font family, spacing, and text hierarchy

Chat Message Styling

• Distinctive Chat Bubbles: User messages now appear as blue gradient bubbles on the right
• Agent Messages: Agent responses use gray gradient bubbles on the left
• Improved Layout: Better alignment and spacing for enhanced readability
• Fade-in Animation: New messages animate in with smooth transitions

Interactive Elements

• Smooth Animations: Added CSS transitions for all interactive elements
• Enhanced Hover States: Better visual feedback on hover
• Focus States: Improved input field styling with blue accent on focus
• Custom Scrollbar: Styled scrollbars that match the modern theme

Technical Enhancements

• Larger Chat Window: Increased from 320x400px to 360x500px for better usability
• Backdrop Blur: Added modern backdrop-filter for enhanced visual depth
• Responsive Design: Maintained responsiveness while improving aesthetics

Files Modified

• api/src/main/resources/templates/sso/dashboard.html - Updated chat container CSS with modern styling
• api/src/main/resources/static/js/chat.js - Enhanced message rendering and animation handling
• api/src/main/resources/templates/fragments/chat.html - Modernized chat button and container styling

Screenshots

Before/After Comparison:

Modernized Chat Interface in Action:

The modernization preserves all existing chat functionality including WebSocket connections, message persistence, and multi-agent support while providing a significantly improved user experience through modern design principles.

Fixes #79.

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