Implement enhanced feedback sidebar with real-time grouping and improved UX

Changes

• Toggleable Feedback Sidebar: Added a collapsible sidebar that can be opened/closed with smooth transitions
• Improved Layout: Redesigned session layout to accommodate the sidebar without overlapping the chat area
• Visual Connections: Added highlight connection lines between message highlights and their corresponding feedback in the sidebar
• Message Synchronization: Real-time sync ensures feedback changes are immediately reflected in the sidebar
• Subscription Management: Added proper cleanup and management of message subscriptions to prevent memory leaks
• Responsive Design: Sidebar adapts properly to different screen sizes and states

Screenshots:

Screen recoding of the changes: Changes video